Top Circuits Page 92
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It must be emphasized that the Bedini Trifilar SG or SSG are not over ‘unity (OU) systems. They are only one-to-one energy shuttle systems. They use one charged input battery to charge 4 or more output batteries. When set up properly, one pays for 1 and one....
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-
Here is a very simple passive headphone box that I have made that works really good. I have used this headphone box in several recording studios that I have worked in and have made them for different people. Because there are no active components, there is....
-
This is a low cost way of measuring temperature and humidity with a computer interface and is intended to be an entry level project for high school students on a tight budget. ..
-
Here the complete electrical circuit diagram of line follower robot which built based on ATmega16. There are three modules of line follower robot circuit that are sensor module, microcontroller module and DC motor module. ..
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This is a motor speed control circuit that allows safe and easy control of 115VAC "universal motors" like drill motors, blender motors, other power tools, etc. The motor is controlled directly by a triac-diac component that is found in variable-speed....
-
You can buy ready-made programmers, but why spend money when you can build it yourself from parts that you have lying around The simple SI-Prog doesn`t require that many parts and is supported by several popular pieces of software. The full SI-Prog is....
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-
Martin ustek has modified the project to also include a Sokoban game. Some information about his version can be found dotted throughout this page; for full details, please visit his website (Czech). Either game can be selected with a menu that appears when....
-
Designed in the fifties, this pre-amp remained in production until 1975. And, it remains fully functional and serviceable today. This discussion is designed to help owners do some basic troubleshooting and, we`ll get into some depth of circuit operation as....
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Amplifier circuit with IC STK is tough and good quality. In this article an amplifier circuit with IC STK another base. Power "Amplifier 200Watt By STK4050. Auto Wiring Diagram Advanced Symbols. Wiring Diagrams Color Coding For The Speaker Wiring On A 1986....
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This text describes preliminary plans for a frequency meter for a bat detector. It measures the frequency of the local oscillator in a heterodyne type bat detector. This provides a valuable tool to help identifying the bat. The frequency is displayed on four....
-
This is a schematic for a straightforward direct-conversion heterodyne detector, having a tuning range of about 10 kHz to 120 kHz. It has been optimised for the use of an electret microphone. The current consumption is very low at only 8 mA, which allows it....
-
-
The multiplication operation that is required to generate a signal of a frequency equal to the difference of the input frequencies, can be implemented in several ways. Actually a multiplied signal generally also appears when two signals are added and....
-
This circuit may look simple, but that`s because I made considerable effort to simplify the circuit. It requires only a small amount of components and it has low current consumption (15 mA). From the left to the right, this circuit consists of a tranducer, a....
-
This project was a particular surprise for me in that the BC547 (equiv 2N2222) can be used to build a 500mW linear amplifier covering the entire HF band with excellent spectral purity and no neutralizing at all. Ugly-bug construction was used but I dare say....
-
The lie detector presented here has been designed to detect skin resistance and to give visual indication, verified electronic project...
-
The simple circuit produces simple audible alarm like notification of sound, used as burglar alarm using five transistor...
-
A stroboscope is an instrument which is used to view the object which is moving rapidly with a periodic motion as if they are at rest. The strobe light flashes at a frequency that synchronizes with the resolution of a wheel or moving object which seems to be....
-
The Telephone project posted here is the a telephone ringer which producespleasanttunes when a call is placed to your number. The tunes produced by telephone ringer here are more melodious andsoothing compare to those of old telephone instrument and piezo....
-
Output frequency or tone of this oscillator circuit varies with the temperature at which the input germanium diode is held. Reverse resistance of D1 varies from 500- © to 10 K ©, when temperature varies between 200C and 800C. (At higher temperature germanium....
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The flash type converter is the simplest and the fastest type of analogue to digital converter. The entire digital output word is present just after the propagation delay time of comparators and the encoding logic gates. A typical conversion time of three....
-
During the distribution of the video some losses and distortion might occur to decrease the quality of the video, but don`t worry here is a simple electronics project to overcome the problem, This video distribution amplifier enables four video recorder or....
-
A few nice midi controller interfaces I found. The Knee(Audio)Pads are a wearable MIDI...
-
High speed 0.2 to 18 GHz frequency range 80 dB isolation Non-reflective Low VSWR and insertion loss Small size, light weight...
-
Since I first got my Arduino and some RGB LEDs I`d wanted to build myself a mood lamp with some funky features (note that I used the word funky and not useful). Well, I`ve finally done it, and here is the blog post describing how. For this project I used the....
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Bike Engine transplant Central, a site devoted to the use of high powered bike engines in lightweight kitcars. Bike Engine transplant Central...
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DR-650 wiring diagram. Suzuki DR-650 is a single cylinder, dual-sport motorcycle. This off-road bike wiring diagram is has wire colors code included. This DR-650 schematic diagram has complete parts wires connection to show, like speedometer, lights, CDI....
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Laptop Schematic Circuit Diagram for Laptop Repair, Laptop Bios Password Remove...
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AC power is rectified and applied to the motor in the same polarity when the momentary switch is held in one direction and reversed polarity when the motor is held in the reverse direction. The remote car starter package that I used includes a control unit,....
-
The electronic circuit described below can switch the clock signal of a Z80 CPU between 2 different sources. This can be used to make a turbo circuit in a Z80-based system. It was originally designed for use in MSX computers, but is probably suited for use....
-
Definition appears very much importance in pairs. ecotherm insulation Trigger on october, at thecircuit. Also in pairs of angle, angle a half adder. in the parallel adder switches. Logicconnection diagram from parallel bcd for block diagram. reversible....
-
The first version of the schematics is finished. There are still some optimizations to do, specially regarding the logic gates. The resistors in the directly connected to the 8085 are not really necessary but handy if a later expansion is needed. It is still....
-
This is a universal remote control I built. The entire thing was programmed with just 1KBof memory, and works with TV`s using the RC 5, RC 80, and NEC protocols (most TV`s). Its effective range is about 40m, and is effective at angles up to 60 degrees. I....
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In this tutorials we are going to tackle out how dos the memory card circuit works on mobile phones. As in my previous post I talked about memory card pin-outs and types of memory cards used on cellular phones. Okay, the block diagram below shows how the....
-
before proceeding to this steps make sure that you already done software calibration and the basic steps on how to check audio circuit components which I already explained here: I also preferred the audio circuit schematic diagram, for easy tracking, by....
-
The TINAH board shield, a printed circuit-board shield designed and built for Phys253 and first used in 2009 by Engineering Physics students and staff. The shield acts as a buffer for protecting the digital and analog inputs and outputs of the Wiring....
-
The Anderson Loop is the simplest detector. Most hams don`t refer to it as an Anderson Loop, and I`ve only seen the loop described as such by the folks who patented it. A good example of an analyzer that uses this detector is the VK5JST Aerial Analyzer.....
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Nothing really new: a JFET is used to sense the electric field generated by high voltage electric line; the JFET amplifies the signal very little, but it lowers the impedence and provide current to a level suitable for transistor amplification. The two....
-
Agy used for the first time Lilypad Arduino and LED s on a textile project called Blinky Bike Bag, combining her expertise in fabric hacking with electronics: The bike bag is made from umbrella material to make it waterproof, and I made it with safety....
-
This evening as I came home from a paragliding appointment, I had a feeling that I must improve my yesterday-written RGB LED driver code. So I cleaned it up a bit, and wrote a lot of comments to make it more useful for educational purposes. I`m alredy over....
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The following is an example for a very simple and high quality JFET preamp. You can use this to amplify a very low signal sources. FET transistors are usually not used independently in preamplifiers. In most of the cases they are paired with bipolar....
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The power controller module used in the system takes input directly from a momentary switch and uses that to toggle a relay that passes mains power to the system’s transformers. The controller circuit operates at 12V and as I understand was chosen to allow a....
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-
It was one of those days that you should learn some chemistry, philosophy and literature. So I thought something like what am I going to do today I started a project I did want to make for a longer time, but for what I never could find the time and....
-
I read Doug Grant`s article regarding Heathkit in his Blog via the EDN Network. Doug reminisced about building his first Heathkit and how much he learned. He suggested that every EE had at least one kit and I suspect he is right. However, as Doug pointed....
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This project has only a few modifications from the Single Chip, Four Channel Datalogger article, so I won`t go into much detail. Below is the schematic. The changes from Dan`s datalogger are that I used the PIC16F886, which is pin-compatible with the PIC....
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Connecting the CPLD board to a ChipKit board, to be able to read the measured frequency...
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The TEM that we have, the Jeol 2000fx is equipped with two extra detectors, one secondary electron detector, i. e. SEM imaging, as well as a STEM detector at the bottom of the microscope. Because the system are from the 80`s the imaging from these detectors....
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Our car radio has the annoying habit of forgetting what part of a CD it was playing when you turn it off. On long drives this is a real drag; I`ll leave an audio book playing for my family in the car while I gas up, and when I turn the key from Accessory to....
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Having a very healthy population of moles in our vicinity, I logged onto eBay and bought four of the cheaply available (ultra )sonic mole deterrents for our garden lawns in the hope of persuading them to move elsewhere. Here`s a link to a couple of similar....
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Well I finally got round to purchasing an Arduino Uno Open Source Prototyping Platform and first impressions are...
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Create simple Hello world example of serial comm to a PC using microcontroller USART...
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So, after yesterday`s post about The Demon Machine I decided it would be fun to play around with the BBC Micro Model B and so I plugged it in and powered up. The familiar two-tone boot sound played and the machine was on. About 15 minutes after power up....
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First thing`s first, what software to use I went with CadSoft Eagle primarily because there are lots of tutorials out there covering it, and that seemed like a good place to start. Once I understand the process I can worry about what software I use, but for....
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The article on my RGB LED fader has been one of the most-visited articles on this blog. Since posting it, I`ve designed and built another microcontroller-based RGB LED project, this time controlling the colors from the computer over USB. The AVR needs to be....
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In order to avoid any soldering mistakes, I asked students to place all there resistors in the board first, and once I checked them, they could solder away. Capacitors were next, then LEDs then everything else. The middle school class had more success with....
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-
This guide will show you how to install an EDM/UKDM Honda Integra DC2 rear fog light on your 05-06 Acura RSX...
-
For our second build in the Make It Last Build Series, we`re constructing a robotic plant. This week, we`re going to put together the brains of the machine, which we will use in the coming weeks to bring our plant to life. This basic circuit will have....
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Tengu derives its name from a mythicalJapanese creature known for getting intomischief. Our Tengu, however is more earthly in nature. It responds to voice and sounds and takes on different facial features depending on the intensity of the sound. If no sound....
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My original idea for this project was simply to try and interface the WINTEK WD-C2401P lcd panel to the pic (see my previous post). I figured it would be fun to add a couple of ADC readings to display something useful on the lcd. PORTB on the PIC is used as....
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WITH its deep, mellow notes, the electric organ is fast gaining the musical limelight. As a rule, these instruments are large and costly. Yet, for the price of a new hat, you can build a duplicate of a small organ that was featured in a recent coast-to-coast....
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Before I emailed Pablo Gian Villamil and he sent me on a link to his class notes (yay!) for Generating polyphonic sound with Arduino I tried to work out his circuitry from his various blog posts and component listings CMOS Hex Schmitt Trigger Inverter....
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I calculated the RSet resistor value at ~17k though it should probably have been 28k according to the table on the page (the MV7744 data sheet list Vf = 2. 1V and If = 20mA) but that`s for an LED matrix not individual LEDs happy for you to work out what this....
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When my girlfriend and I moved into our small apartment in San Francisco we wanted to setup some sort of compact liquor cabinet and wine rack. After a quick trip to IKEA we had a bookshelf we could easily convert into a fancy boozeshelf unit! *insert music....
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Though some might argue that Serial port are things in the past, it is still the most popular port for those who are into electronic DIY. Building electronic device with serial port interface is cheaper than buiding one that uses USB. That is the reason why....
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Rechargeable lithium-ion (Li-ion) batteries are everywhere these days, powering everything from laptops and tablets to cell phones, MP3 players, digital cameras, and all sorts of portable electronics. But what`s the best way to charge them This app note....
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The goal of this project was to explore how objects, places, and people can be linked wirelessly. We began discussing how we might approach this task. Will this be for private or public use How many people will be interacting with the project Will we use....
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I used alligator clips to make the circuit and have it working. Then worked on the code and especially on the blinking section to make the LEDs look like they are blinking randomly and not in any order. I used the values read and send by the sensor to....
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I first tried a lot of different circuit combinations with alligator clips and different interactions with code. For example, I could have them turn on individually and sequentially (A, B, C) or have them turn on sequentially but stay lit (A, AB, ABC). I....
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Before you purchase your HID kit, first thing you need to do is to find out what is the appropriate bulb size ( i.e. H1, H3, H4, H7, H9, H10, H11, H13, 9004...
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Solar charge controller is an electronic device which is used in solar system installation to control the amount of charge going towards the battery from solar panel. Charge Controller are available in different types and ratings. The term "charge....
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For the past year and a half I (Mark) have been part of an Ann Arbor, Michigan based group named GO-Tech. The common thread among the group members is that each of us is interested in making things using technology (combining hardware, software, metal, wood,....
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The interface depicted below can be used build a serial cable to connect the serial port of the computer to the 16-pin OBD-II connecter found in many cars build in 1996 or later. This interface only supports the ISO 9141-2 / ISO 14230-2 K-line tranfer mode.....
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Now the camera mount is very sturdy, and I went a year without using one a tether, but if you like to ski through the woods filled with deep powder, let me tell you: a safety strap is a good idea. It`s made from a 12" toy dog collar! All you do is slide the....
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Chrono or Chronograph, the term used by Airsofter and Paintball players to refer to the device that measures the muzzle velocity of firearms. This is also called MVMD, short for Muzzle Velocity Measuring Device by the British Army. Muzzle Velocity is the....
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I chose the Nexus 4 as these devices are traditionally very open, as you can see in case of the Nexus 4 e. g. by the availability of Ubuntu Touch images. I didn`t expect however for it to be that hackable as I was about to find out on Saturday. I had just....
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Everything is working with simple passive mosfet drive. But if we increase switching frequency or place powerful mosfet (or even several mosfets) There is no load in gate circuit, but there is gate capacitance. And if we need fast switching we must charge....
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Simple few transistors generator and transformer A transforms 1. 5V battery voltage to few hundred of volts. This is quite high voltage. Then this high-voltage current passes through a diode, which rectifies current to DC. This DC current is stored in quite....
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To start old Optrex DMC50264N LCD module you need to get +24V LCD bias voltage Where to get it if you have only low voltage 3 5V As LCD module drains very low current, it is possible to build very small DC/DC converter. There are lots of chips designed for....
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Sometimes I need small high voltage power supply for my projects. And I don`t want to make special transformers. And I don`t want to use special chips for it. In internet I found very simple circuit diagram for classical step-up converter. It is base on very....
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My Machtech tester is capable of metering the capacitors, but is very complicated to measure short lead capacitors, not speaking about SMD ones. Also, I needed to measure the coils. In I found some LC meter schematics. It was quite interesting and capable to....
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I have few Kenwood TK-760G-1 transceivers (two-way radios) and they all were programmed to one channel and all other features were locked. In the internet and in local newsgroup I collected various software for Kenwood programming. All I needed is....
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After I smashed about 5 mobile phones and collected some white LEDs, I decided to build some some LED searchlight. There are two ways to solve this problem: first, Chinese version, just connect some white LED`s to battery and use some ballast resistor. And....
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I forced myself to use and learn about programmable logic chips. As I wrote in my older post, I have very small inventory of the chips and was forced to use Lattice isp2032VE110LT144 chip. I received great help reading article from Seattle Robotics Society....
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In older posts I mentioned, that I resoldered several ATMEL ATMEGA16 processors. So, I decided to build something usefull using this MCU. As this controller has more ROM and RAM, I decided to use only high level programming language- C. All software in these....
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Dimmer, from the word n. dim, v. to dim . Simple device to make light of incandescence lamps lower. Also, used to slow down colector motors. All this started because Lithuanian internet is full of old soviet circuits with archaic components. Meanwhile other....
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I originally wanted to call it Chimera , but then I remembered there`s already a synth company using that name, so I went with Cerberus to avoid confusion, and because Tricephalic Filter just doesn`t have the same ring to it. I didn`t bother renaming the....
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Some of the components for the EQ are mounted on the pots. The only additions I`ve made to the circuit from the last posted schematic is to add a feedback loop from the line output to the switched side of the first input jack, so that the connection is cut....
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I`ve decided to start selling these on ebay to raise some money for parts. Here`s a link to the current auction and here`s a photo of the current model: Switchgate is a simple dual gate based on a 556 in monostable mode (with trigger input), with the....
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This circuit is a resonant twin-t filter. In this circuit, its purpose (according to the creator), is to give a decent fake lowpass response , which it does fairly well. Tim`s schematic shows two variations, one with self-oscillation, and one without. I....
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H bridge applications for robots, robotics, and motor control. This post focuses on the low side switch element...
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Arduino Uno a simple hack that bypasses the USB circuitry to program the device with a serial port...
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Previously, an article was posted on how to connect to the Raspberry PI board from a Linux PC using the serial port. We now look at how to do the same thing using a Windows PC. In this article, a Windows 8 PC is connected to the Raspberry PI through a USB to....
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As a fully-featured Linux computer there are many external programmers that can be used with your Raspberry Pi to program the Atmel AVR range of microprocessors. It`s also possible to use the general purpose input/output lines (GPIOs) found on the Raspberry....
It must be emphasized that the Bedini Trifilar SG or SSG are not over ‘unity (OU) systems. They are only one-to-one energy shuttle systems. They use one charged input battery to charge 4 or more output batteries. When set up properly, one pays for 1 and one....
Here is a very simple passive headphone box that I have made that works really good. I have used this headphone box in several recording studios that I have worked in and have made them for different people. Because there are no active components, there is....
This is a low cost way of measuring temperature and humidity with a computer interface and is intended to be an entry level project for high school students on a tight budget. ..
Here the complete electrical circuit diagram of line follower robot which built based on ATmega16. There are three modules of line follower robot circuit that are sensor module, microcontroller module and DC motor module. ..
This is a motor speed control circuit that allows safe and easy control of 115VAC "universal motors" like drill motors, blender motors, other power tools, etc. The motor is controlled directly by a triac-diac component that is found in variable-speed....
You can buy ready-made programmers, but why spend money when you can build it yourself from parts that you have lying around The simple SI-Prog doesn`t require that many parts and is supported by several popular pieces of software. The full SI-Prog is....
Martin ustek has modified the project to also include a Sokoban game. Some information about his version can be found dotted throughout this page; for full details, please visit his website (Czech). Either game can be selected with a menu that appears when....
Designed in the fifties, this pre-amp remained in production until 1975. And, it remains fully functional and serviceable today. This discussion is designed to help owners do some basic troubleshooting and, we`ll get into some depth of circuit operation as....
Amplifier circuit with IC STK is tough and good quality. In this article an amplifier circuit with IC STK another base. Power "Amplifier 200Watt By STK4050. Auto Wiring Diagram Advanced Symbols. Wiring Diagrams Color Coding For The Speaker Wiring On A 1986....
This text describes preliminary plans for a frequency meter for a bat detector. It measures the frequency of the local oscillator in a heterodyne type bat detector. This provides a valuable tool to help identifying the bat. The frequency is displayed on four....
This is a schematic for a straightforward direct-conversion heterodyne detector, having a tuning range of about 10 kHz to 120 kHz. It has been optimised for the use of an electret microphone. The current consumption is very low at only 8 mA, which allows it....
The multiplication operation that is required to generate a signal of a frequency equal to the difference of the input frequencies, can be implemented in several ways. Actually a multiplied signal generally also appears when two signals are added and....
This circuit may look simple, but that`s because I made considerable effort to simplify the circuit. It requires only a small amount of components and it has low current consumption (15 mA). From the left to the right, this circuit consists of a tranducer, a....
This project was a particular surprise for me in that the BC547 (equiv 2N2222) can be used to build a 500mW linear amplifier covering the entire HF band with excellent spectral purity and no neutralizing at all. Ugly-bug construction was used but I dare say....
The lie detector presented here has been designed to detect skin resistance and to give visual indication, verified electronic project...
The simple circuit produces simple audible alarm like notification of sound, used as burglar alarm using five transistor...
A stroboscope is an instrument which is used to view the object which is moving rapidly with a periodic motion as if they are at rest. The strobe light flashes at a frequency that synchronizes with the resolution of a wheel or moving object which seems to be....
The Telephone project posted here is the a telephone ringer which producespleasanttunes when a call is placed to your number. The tunes produced by telephone ringer here are more melodious andsoothing compare to those of old telephone instrument and piezo....
Output frequency or tone of this oscillator circuit varies with the temperature at which the input germanium diode is held. Reverse resistance of D1 varies from 500- © to 10 K ©, when temperature varies between 200C and 800C. (At higher temperature germanium....
The flash type converter is the simplest and the fastest type of analogue to digital converter. The entire digital output word is present just after the propagation delay time of comparators and the encoding logic gates. A typical conversion time of three....
During the distribution of the video some losses and distortion might occur to decrease the quality of the video, but don`t worry here is a simple electronics project to overcome the problem, This video distribution amplifier enables four video recorder or....
A few nice midi controller interfaces I found. The Knee(Audio)Pads are a wearable MIDI...
High speed 0.2 to 18 GHz frequency range 80 dB isolation Non-reflective Low VSWR and insertion loss Small size, light weight...
Since I first got my Arduino and some RGB LEDs I`d wanted to build myself a mood lamp with some funky features (note that I used the word funky and not useful). Well, I`ve finally done it, and here is the blog post describing how. For this project I used the....
Bike Engine transplant Central, a site devoted to the use of high powered bike engines in lightweight kitcars. Bike Engine transplant Central...
DR-650 wiring diagram. Suzuki DR-650 is a single cylinder, dual-sport motorcycle. This off-road bike wiring diagram is has wire colors code included. This DR-650 schematic diagram has complete parts wires connection to show, like speedometer, lights, CDI....
Laptop Schematic Circuit Diagram for Laptop Repair, Laptop Bios Password Remove...
AC power is rectified and applied to the motor in the same polarity when the momentary switch is held in one direction and reversed polarity when the motor is held in the reverse direction. The remote car starter package that I used includes a control unit,....
The electronic circuit described below can switch the clock signal of a Z80 CPU between 2 different sources. This can be used to make a turbo circuit in a Z80-based system. It was originally designed for use in MSX computers, but is probably suited for use....
Definition appears very much importance in pairs. ecotherm insulation Trigger on october, at thecircuit. Also in pairs of angle, angle a half adder. in the parallel adder switches. Logicconnection diagram from parallel bcd for block diagram. reversible....
The first version of the schematics is finished. There are still some optimizations to do, specially regarding the logic gates. The resistors in the directly connected to the 8085 are not really necessary but handy if a later expansion is needed. It is still....
This is a universal remote control I built. The entire thing was programmed with just 1KBof memory, and works with TV`s using the RC 5, RC 80, and NEC protocols (most TV`s). Its effective range is about 40m, and is effective at angles up to 60 degrees. I....
In this tutorials we are going to tackle out how dos the memory card circuit works on mobile phones. As in my previous post I talked about memory card pin-outs and types of memory cards used on cellular phones. Okay, the block diagram below shows how the....
before proceeding to this steps make sure that you already done software calibration and the basic steps on how to check audio circuit components which I already explained here: I also preferred the audio circuit schematic diagram, for easy tracking, by....
The TINAH board shield, a printed circuit-board shield designed and built for Phys253 and first used in 2009 by Engineering Physics students and staff. The shield acts as a buffer for protecting the digital and analog inputs and outputs of the Wiring....
The Anderson Loop is the simplest detector. Most hams don`t refer to it as an Anderson Loop, and I`ve only seen the loop described as such by the folks who patented it. A good example of an analyzer that uses this detector is the VK5JST Aerial Analyzer.....
Nothing really new: a JFET is used to sense the electric field generated by high voltage electric line; the JFET amplifies the signal very little, but it lowers the impedence and provide current to a level suitable for transistor amplification. The two....
Agy used for the first time Lilypad Arduino and LED s on a textile project called Blinky Bike Bag, combining her expertise in fabric hacking with electronics: The bike bag is made from umbrella material to make it waterproof, and I made it with safety....
This evening as I came home from a paragliding appointment, I had a feeling that I must improve my yesterday-written RGB LED driver code. So I cleaned it up a bit, and wrote a lot of comments to make it more useful for educational purposes. I`m alredy over....
The following is an example for a very simple and high quality JFET preamp. You can use this to amplify a very low signal sources. FET transistors are usually not used independently in preamplifiers. In most of the cases they are paired with bipolar....
The power controller module used in the system takes input directly from a momentary switch and uses that to toggle a relay that passes mains power to the system’s transformers. The controller circuit operates at 12V and as I understand was chosen to allow a....
It was one of those days that you should learn some chemistry, philosophy and literature. So I thought something like what am I going to do today I started a project I did want to make for a longer time, but for what I never could find the time and....
I read Doug Grant`s article regarding Heathkit in his Blog via the EDN Network. Doug reminisced about building his first Heathkit and how much he learned. He suggested that every EE had at least one kit and I suspect he is right. However, as Doug pointed....
This project has only a few modifications from the Single Chip, Four Channel Datalogger article, so I won`t go into much detail. Below is the schematic. The changes from Dan`s datalogger are that I used the PIC16F886, which is pin-compatible with the PIC....
Connecting the CPLD board to a ChipKit board, to be able to read the measured frequency...
The TEM that we have, the Jeol 2000fx is equipped with two extra detectors, one secondary electron detector, i. e. SEM imaging, as well as a STEM detector at the bottom of the microscope. Because the system are from the 80`s the imaging from these detectors....
Our car radio has the annoying habit of forgetting what part of a CD it was playing when you turn it off. On long drives this is a real drag; I`ll leave an audio book playing for my family in the car while I gas up, and when I turn the key from Accessory to....
Having a very healthy population of moles in our vicinity, I logged onto eBay and bought four of the cheaply available (ultra )sonic mole deterrents for our garden lawns in the hope of persuading them to move elsewhere. Here`s a link to a couple of similar....
Well I finally got round to purchasing an Arduino Uno Open Source Prototyping Platform and first impressions are...
Create simple Hello world example of serial comm to a PC using microcontroller USART...
So, after yesterday`s post about The Demon Machine I decided it would be fun to play around with the BBC Micro Model B and so I plugged it in and powered up. The familiar two-tone boot sound played and the machine was on. About 15 minutes after power up....
First thing`s first, what software to use I went with CadSoft Eagle primarily because there are lots of tutorials out there covering it, and that seemed like a good place to start. Once I understand the process I can worry about what software I use, but for....
The article on my RGB LED fader has been one of the most-visited articles on this blog. Since posting it, I`ve designed and built another microcontroller-based RGB LED project, this time controlling the colors from the computer over USB. The AVR needs to be....
In order to avoid any soldering mistakes, I asked students to place all there resistors in the board first, and once I checked them, they could solder away. Capacitors were next, then LEDs then everything else. The middle school class had more success with....
This guide will show you how to install an EDM/UKDM Honda Integra DC2 rear fog light on your 05-06 Acura RSX...
For our second build in the Make It Last Build Series, we`re constructing a robotic plant. This week, we`re going to put together the brains of the machine, which we will use in the coming weeks to bring our plant to life. This basic circuit will have....
Tengu derives its name from a mythicalJapanese creature known for getting intomischief. Our Tengu, however is more earthly in nature. It responds to voice and sounds and takes on different facial features depending on the intensity of the sound. If no sound....
My original idea for this project was simply to try and interface the WINTEK WD-C2401P lcd panel to the pic (see my previous post). I figured it would be fun to add a couple of ADC readings to display something useful on the lcd. PORTB on the PIC is used as....
WITH its deep, mellow notes, the electric organ is fast gaining the musical limelight. As a rule, these instruments are large and costly. Yet, for the price of a new hat, you can build a duplicate of a small organ that was featured in a recent coast-to-coast....
Before I emailed Pablo Gian Villamil and he sent me on a link to his class notes (yay!) for Generating polyphonic sound with Arduino I tried to work out his circuitry from his various blog posts and component listings CMOS Hex Schmitt Trigger Inverter....
I calculated the RSet resistor value at ~17k though it should probably have been 28k according to the table on the page (the MV7744 data sheet list Vf = 2. 1V and If = 20mA) but that`s for an LED matrix not individual LEDs happy for you to work out what this....
When my girlfriend and I moved into our small apartment in San Francisco we wanted to setup some sort of compact liquor cabinet and wine rack. After a quick trip to IKEA we had a bookshelf we could easily convert into a fancy boozeshelf unit! *insert music....
Though some might argue that Serial port are things in the past, it is still the most popular port for those who are into electronic DIY. Building electronic device with serial port interface is cheaper than buiding one that uses USB. That is the reason why....
Rechargeable lithium-ion (Li-ion) batteries are everywhere these days, powering everything from laptops and tablets to cell phones, MP3 players, digital cameras, and all sorts of portable electronics. But what`s the best way to charge them This app note....
The goal of this project was to explore how objects, places, and people can be linked wirelessly. We began discussing how we might approach this task. Will this be for private or public use How many people will be interacting with the project Will we use....
I used alligator clips to make the circuit and have it working. Then worked on the code and especially on the blinking section to make the LEDs look like they are blinking randomly and not in any order. I used the values read and send by the sensor to....
I first tried a lot of different circuit combinations with alligator clips and different interactions with code. For example, I could have them turn on individually and sequentially (A, B, C) or have them turn on sequentially but stay lit (A, AB, ABC). I....
Before you purchase your HID kit, first thing you need to do is to find out what is the appropriate bulb size ( i.e. H1, H3, H4, H7, H9, H10, H11, H13, 9004...
Solar charge controller is an electronic device which is used in solar system installation to control the amount of charge going towards the battery from solar panel. Charge Controller are available in different types and ratings. The term "charge....
For the past year and a half I (Mark) have been part of an Ann Arbor, Michigan based group named GO-Tech. The common thread among the group members is that each of us is interested in making things using technology (combining hardware, software, metal, wood,....
The interface depicted below can be used build a serial cable to connect the serial port of the computer to the 16-pin OBD-II connecter found in many cars build in 1996 or later. This interface only supports the ISO 9141-2 / ISO 14230-2 K-line tranfer mode.....
Now the camera mount is very sturdy, and I went a year without using one a tether, but if you like to ski through the woods filled with deep powder, let me tell you: a safety strap is a good idea. It`s made from a 12" toy dog collar! All you do is slide the....
Chrono or Chronograph, the term used by Airsofter and Paintball players to refer to the device that measures the muzzle velocity of firearms. This is also called MVMD, short for Muzzle Velocity Measuring Device by the British Army. Muzzle Velocity is the....
I chose the Nexus 4 as these devices are traditionally very open, as you can see in case of the Nexus 4 e. g. by the availability of Ubuntu Touch images. I didn`t expect however for it to be that hackable as I was about to find out on Saturday. I had just....
Everything is working with simple passive mosfet drive. But if we increase switching frequency or place powerful mosfet (or even several mosfets) There is no load in gate circuit, but there is gate capacitance. And if we need fast switching we must charge....
Simple few transistors generator and transformer A transforms 1. 5V battery voltage to few hundred of volts. This is quite high voltage. Then this high-voltage current passes through a diode, which rectifies current to DC. This DC current is stored in quite....
To start old Optrex DMC50264N LCD module you need to get +24V LCD bias voltage Where to get it if you have only low voltage 3 5V As LCD module drains very low current, it is possible to build very small DC/DC converter. There are lots of chips designed for....
Sometimes I need small high voltage power supply for my projects. And I don`t want to make special transformers. And I don`t want to use special chips for it. In internet I found very simple circuit diagram for classical step-up converter. It is base on very....
My Machtech tester is capable of metering the capacitors, but is very complicated to measure short lead capacitors, not speaking about SMD ones. Also, I needed to measure the coils. In I found some LC meter schematics. It was quite interesting and capable to....
I have few Kenwood TK-760G-1 transceivers (two-way radios) and they all were programmed to one channel and all other features were locked. In the internet and in local newsgroup I collected various software for Kenwood programming. All I needed is....
After I smashed about 5 mobile phones and collected some white LEDs, I decided to build some some LED searchlight. There are two ways to solve this problem: first, Chinese version, just connect some white LED`s to battery and use some ballast resistor. And....
I forced myself to use and learn about programmable logic chips. As I wrote in my older post, I have very small inventory of the chips and was forced to use Lattice isp2032VE110LT144 chip. I received great help reading article from Seattle Robotics Society....
In older posts I mentioned, that I resoldered several ATMEL ATMEGA16 processors. So, I decided to build something usefull using this MCU. As this controller has more ROM and RAM, I decided to use only high level programming language- C. All software in these....
Dimmer, from the word n. dim, v. to dim . Simple device to make light of incandescence lamps lower. Also, used to slow down colector motors. All this started because Lithuanian internet is full of old soviet circuits with archaic components. Meanwhile other....
I originally wanted to call it Chimera , but then I remembered there`s already a synth company using that name, so I went with Cerberus to avoid confusion, and because Tricephalic Filter just doesn`t have the same ring to it. I didn`t bother renaming the....
Some of the components for the EQ are mounted on the pots. The only additions I`ve made to the circuit from the last posted schematic is to add a feedback loop from the line output to the switched side of the first input jack, so that the connection is cut....
I`ve decided to start selling these on ebay to raise some money for parts. Here`s a link to the current auction and here`s a photo of the current model: Switchgate is a simple dual gate based on a 556 in monostable mode (with trigger input), with the....
This circuit is a resonant twin-t filter. In this circuit, its purpose (according to the creator), is to give a decent fake lowpass response , which it does fairly well. Tim`s schematic shows two variations, one with self-oscillation, and one without. I....
H bridge applications for robots, robotics, and motor control. This post focuses on the low side switch element...
Arduino Uno a simple hack that bypasses the USB circuitry to program the device with a serial port...
Previously, an article was posted on how to connect to the Raspberry PI board from a Linux PC using the serial port. We now look at how to do the same thing using a Windows PC. In this article, a Windows 8 PC is connected to the Raspberry PI through a USB to....
As a fully-featured Linux computer there are many external programmers that can be used with your Raspberry Pi to program the Atmel AVR range of microprocessors. It`s also possible to use the general purpose input/output lines (GPIOs) found on the Raspberry....
