Vacuum Tubes Valves
Musical & effects
Yagi Uda Antennas
Metal Detector Circuits
Liquid Sensing Circuits
Light Sensing Circuits
Voltage Detector Circuits
Air-Gas Detection Circuits
Human Sensing Circuits
RF & Radiation
Optical Sensing Circuits
Free Energy Circuits
AC to DC & DC to DC
Solar Cell Circuits
Micro Power Circuits
Switching Power Supplies
Light Laser LED
Digital to Analog
Analog to Digital
Data Bus Circuits
Voltage to Pulse
Current to Voltage
Frequency to Voltage
RF Converter Circuits
Sine to Square Wave
Voltage to Current
voltage to frequency
Period to Voltage
Video Wall circuits
TV Video Circuits
Motor Control Circuits
8051 / 8052
PCB CAD Software
Car bike Circuits
555 Timer Circuits
Remote Control Toy
H Bridge Circuit
Interconnection & Timing
Digital Signal Integrity
Digital & Bipolars
Sensors & Detectors
Regulated Power Supply
4 Band Resistor
5 Band resistor
6 Band resistor
New Circuits Page 22
Adding VU Meter to Dantimax thatmic preamp
Hi all, i`ve recently bought the dantimax thatmic pre amp and i was wondering if anyone could point me in the right direction to install a vu meter..
SAFE SWITCHING OF SOLENOIDS
Optical Receiver Circuits
The overall task of the optical receiver is to extract the information that has been placed on the modulated light carrier by the distant transmitter and restores the information to its original form. The typical through-the-air communications receiver can be broken down into five separate sections. These are: light collector (lens), light detecto
Bike Engine transplant Central
Bike Engine transplant Central, a site devoted to the use of high powered bike engines in lightweight kitcars. Bike Engine transplant Central.
Power supply circuit design
C1=1000 Micro Farad aluminum electrolytic capacitor (For loads less than 100mA you can sustitute with 220 microfards capacitor), Voltage rating = 2. 5 times of Output Voltage. C1 = 1000 Micro Farad aluminum electrolytic capacitor(For loads less than 100mA you can sustitute with 220 microfards capacitor). Voltage rating = 2. 5 times of Output Volta
AVR ATtiny USB Tutorial
This is the second part of my USB tutorial for ATtiny2313 and V-USB library. In the first part we learned how to get 3. 3V from USB to power our circuits. In this part, we will expand our setup with following parts: Update: Some people have noted that the setup I`m using here runs ATtiny2313 at 12 MHz with only 3. 3V VCC, which is outside the...
Light dimmer circuit using DIAC and TRIAC
Light dimmer circuit is using to adjust the illumination of lamp. The below circuit shows the basic TRIAC triggering circuit using DIAC. Here in this circuit the light illumination is controlled using TRIAC and DIAC. The resister and capacitor are connected in series. The capacitor is made to charge through the 500K resistor. When the capacitor st
Whistle Light Switch
With this whistle light switch you can turn on and off the lighting installation. The main part of this circuit is the UM3763 IC, produced by UMC. The piezo-ceramic buzzer is used here as a microphone and when it receives a tone frequency between 1. 2 kHz and 1. 8 kHz, the IC`s output will go HIGH. This means that the light will go ON if it was...
LA4555 Audio Amplifier
LA4555 Audio Amplifier Stereo circuit and mono circuit are given in schematic .LA 4555 is basically a stereo amplifier with 2.3 watts into 4 ohms speakers at a total dis..
Daft Punk Coffee Table 5x5 LED Matrix using an Arduino
You may need also need 10 diodes and different resistors, especially if you are using white LED`s please the Troubleshooting section in step 3 for details. . 005 ³ thick matte drafting film I bought a sheet from a local artist`s supply store. The smallest sheet they had was way more than I needed 24G—36 ³ The LED`s I used were po
making led flash every 0 6 seconds
Tweet Hey guys, I have a question about electronics. One project ive been intending to do is something simple: make a circuit which makes an LED flash ..
rf Can I merge two impedance matching circuits
Place the transciever and the chip antenna very close, then there is no need for a 50 ohm transmission line right If so, can I somehow merge those two matching circuits into one and thus reducing component count
Precise Camera Panning with Stepper Motors
The prototype circuit board used an external LCD display that received commands via an RS-232 interface. Although it worked well programming it was cumbersome. For this reason the circuit board was revised so that it would support a directly attached LCD display. This view of the back of the board shows the LCD connector more clearly. It also show
ultra bright led lamp
This ultra-bright white LED lamp works on 230V AC with minimal power consumption. It can be used to illuminate VU meters, SWR meters, etc. Ultra-bright LEDs available in the market cost Rs 8 to 15. These LEDs emit a 1000-6000mCd bright white light like welding arc and work on 3 volts, 10 mA. Their maximum voltage is 3.6 volts and the current is...
circuit power audio amplifier with
This circuit is a complete application is 2. 1 amp, two satellite speakers for TDA and one for the subwoofer, making the 2. 1 system, widely used in commercial applications as an amplifier for computers, which may give an increased in its audio system with a stereo amplifier + bass amplifier (subwoofer). The power supply is of symmetric type, using
A noise generator with a wideband output signal is always handy to have around when you`re adjusting receivers and other types of HF equipment. Simple RF Noise Source Circuit Diagram: read more †’
Overvoltage Protection Circuit
An overvoltage protection circuit is a circuit which protects electronics from excess voltage, which could potentially damage or destroy electronic components. In this project, we will build a simple, yet effective, overvoltage protection circuit using a fuse and a zener diode, as the protecting elements, that will work for electronics that operat
555 timer Led Flasher circuit electronic project
This LED Flasher circuit is based on the 555 timer IC. The LED Flasher circuit diagram is very simple and require few external components. When the circuit is working the red LEDs will flash at a set frequency one by one like at the railway crossing indicator.
24 hour clock without the 1 hertz reference circuitry
Radiation Detector and Meter DT-590A/PDR-56F Scintillation Probe
This pdf file shows the schematic diagram of my home-built circuit to drive the PDR-56 probe. A JKL BXA-12579 inverter commonly used to drive cold-cathode fluorescent lamps is used as the high-voltage power supply. The BXA-12579 produces 1, 500 VACRMS for a 12 VDC input. The AC output is tapped straight from the transformer`s secondary and rectifie
USB Live Oscilloscope: Clock Generator
Produce the varying sampling clock write strobe pulses. So, I settled with this semi-optimal but working design applying an ATtiny2313 microcontroller from Atmel. For a 10MHz sampling clock, I need a 20MHz clock for the ATtiny2313and hence it needs to be powered at 5V instead of 3. 3V like all the other logic around. So, I had to add these HCT04...
UKDM Honda DC2 rear fog lamp to an RSX
This guide will show you how to install an EDM/UKDM Honda Integra DC2 rear fog light on your 05-06 Acura RSX.
Audio Memo Alert Circuit
This device prevents paper notes and memos from being overlooked. A paper note placed between two fingers made of a conducting material (metal or conductive plastic) breaks the circuit, allowing pair 1 of Ul-a to go high. We aim to transmit more information by carrying articles. Please send us an E-mail to wanghuali@hqew. net within 15 days if we a
AFSK WITH PLL
Complete terminal unit and AFSK tone generator for VHF bands synthesizes tones digitally for 170-Hz narrow shift and 850-Hz standard shift found in VHF amateur RTTY bands. Additional feature is PLL circuit that follows drifting signal and copies signals from which mark or space information is missing. Precision AFSK generator consists of...
2N2222 NPN Small Signal General Purpose Amplifiers
This article describes the Teralab Electronics projects Robert Hunt (2N2222). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these components: 2N2222. This si. This article describes the Projects and Designs
how to use triacs for inductive loads
led lighting for 6v vehicles
This design replaces the incandescent bulbs in the stop, tail and indicator lights of an MZ or other motorcycle with a six-volt electrical system,with high-intensity Lumiled LEDs. This gives the following advantages: A single Lumiled with a power consumption of around 1. 2W gives a light output equivalent to a colour-filtered 21W incandescent...
How Compact Fluorescent Lamps Work and How to Dim Them
Dimming function opens up a completely new family of CFL applications Compact fluorescent lamps (CFLs) are replacing incandescent light bulbs at a rapid rate due to their..
400mA Micropower Synchronous Step-Up DC/DC Converter with Output Disconnect
The LTC ®3525-3/LTC3525-3. 3/LTC3525-5 are high efficiency synchronous step-up DC/DC converters with output disconnect that can start up with an input as low as 1V. They offer a compact, high efficiency alternative to charge pumps in single cell or dual cell alkaline or Li-Ion applications. Only three small external components are required. The LTC
MLX90224 Dual Hall Effect Latch
RGB Video Amplifier with OSD Input, MM1381XD, MM1382XD and MM1383XD are wideband RGB Video Amplifiers with OSD input, developed for monitors. The main differences among them are Video amp bandwidth, output rise time, and output fall time. By Mitsumi Electronics, Corp.
ATmega8 and Hall Sensor A1302
The A1301 and A1302 are continuous-time, ratiometric, linear Hall-effect sensor ICs. They are optimized to accurately provide a voltage output that is proportional to an applied magnetic field. These devices have a quiescent output voltage that is 50% of the supply voltage. If you connect this voltage output to a microcontroller`s ADC port, having
Real-Time Energy Monitor with Arduino and LabVIEW
The system consists of two parts: the Arduino board that detects the led pulses and sends the data via the XBee module, and a PC that recive the data through a USB/Xbee module and processes the data with LabVIEW so you can prepare and study the consumption in a very instant. To detect the LED blinking you have to apply a simple photoresistor above
remote field recorders automated frog call data loggers
Automated frog call data loggers have been used successfully to provide information on: (1) species presence at the time of sampling (that is, species likely to be overlooked during time-constraint sampling can be recorded with greater reliability); (2) life history and phenology information, such as when frogs call (especially if different specie
Discrete PWM Generator Circuit
PWM waveforms are commonly used to control the speed of DC motors. The mark/space ratio of the digital wave-form can be defined either by using an adjustable analogue voltage level (in the case of a NE555 based PWM generator) or digitally using binary values. Digitally derived PWM waveforms are most often produced by the timer/counter modules in...
art364 / Standalone Arduino
To power it up you need a clean stable source of 5 volts DC. This means that you either pick up a switching 5v DC power supply from our favorite JK Electronics, mail order one from Jameco or you will have to wire up a voltage regulator. Page 254 of Phys Comp has a nice layout of a 7805 voltage regulator with a couple decoupling capacitors. Finally
modified battery charger circuit
Using a transistor won`t give accurate results, moreover the setting part would become very tedious. The circuit is technically correct, if you can adjust the tripping point correctly, then it might just work. Vinod: I made the charger (hysteresis) but there is a problem. i will attach the image to explain the problem. When i connect multimeter...
Zener Diode Tester Test Gears Circuits Schematics
Using a single 555 Timer IC and a small transformer to generate a high voltage, this circuit will test zener diodes of voltage ratings up to 50VDC. The 555 timer is used in the astable mode, the output at pin3 drives a small audio transformer such as the LT700. This has a primary impedance of 1K and a secondary impedance of 8 ohms. Used in reverse
This version of the Link is for those who really need a good cheap intercom that will work reliably, but without access to an outside Telco line. This could be in a pre school, a hobby farm or a small workshop or factory, where external phone traffic needs to be kept separate and protected from phone abusers and kids playing aroundG It follow
3 in one doorbell
The circuit comprises the power supply which is formed by TR1, Q3, D13, Q1, D9 This supplies both the 12 volt rails and the five volt rails for the micro which i..
Parallel Jtag Circuit For Arm Lpc2129
Simple DC power delay circuit
The circuit diagram shown here is of a simple DC power delay circuit that is based on an SCR. This circuit is a very handy one and can be employed in many applications. The working of this circuit is very simple. When the input power is applied the capacitor C2 charges through resistor R2 and when the voltage across the capacitor just exceeds the
Simple bike computer tutorial
The PCB we have made is big and has plenty of space for cutting and adding other bits and pieces. But if we want the final satisfaction of seeing it working, mounting the lot on a real bike, it is a bit too big. Way back in chapter one, we discussed sensors and I recommended we should stay with the herd and use some sort of hall device. Well now w
Colpitts Oscillator Tutorial and Oscillator Design
Colpitts Oscillator Tutorial and the theory behind the design of the Colpitts Oscillator which uses a LC Oscillator tank circuit to generate sine waves..
Tuned Collector Oscillator
Interfacing LM35 Temperature Sensor with PIC Microcontroller
In present day, variety good sensors are available to measure almost anything. In this tutorial will explore the wonderful world of sensors, starting with a very simple analog temperature sensor LM35. We will learn how to interface it with PIC MCU and display the result in common 16x2 lcd module..
AJAX read switches analog
Flicker free updating of analog input and status of switches using Ajax and the Arduino Ethernet Shield. The Arduino Uno is set up as a web server..
3-Bit Binary counter
This circuit "cheats" by using only two J-K flip-flops to make a three-bit binary counter. Ordinarily, three flip-flops would be used - one for each binary bit - but in this case we can use the clock pulse (555 timer output) as a bit of its own. When you build this circuit, you will find that it is a "down" counter. That is, its count sequence...
Feeling chirpy? Attract new friends with this modified hartley oscillator. You could also use it as a replacement doorbell..
3V Sweeping Siren Alarm
A very loud sweeping siren type audio sound generator powered by 3v. The circuit uses a LTC1799 precision frequency generator from Linear Technology. A 74HC14 hex Schmitt trigger from Texas Instruments is also used to perform several other functions. One section is wired as a simple 7Hz square wave oscillator.
33v and 5v dual tracking regulator using lt3692 dc converter
Using the LT3692 dual current mode PWM step-down DC DC converter circuit with two internal 3. 5A switches can be designed a very simple power supply circuit, that can be used for various electronic circuits applications like : distributed supply regulations or automotive circuits. LT3692 provide independent input voltage, shutdown, feedback, soft
DOGM128 with Arduino Hardware
The Dogm-graphics-module should be connected to the Arduino board as shown below. Pin 12 (MISO) of the Arduino board must not be used. Additionally the Dogm-graphics-module requires an addess line (A0) which can be connected to any output port. The following schematic shows the use of the dogm-graphics-module with a 3. 3 volt supply. The level tran
RR tail 2003 H2
Selfrunning Free Energy 5 KW Kapanadze 4
With hv insulation inside ie polystyrene. If you put ferrite in it could be a way to reduce the frequency. But radiant energy won`t like copper. It`ll create a short. Just an opinion, I`ve not experimented with it - except I know ordinary cable won`t work. My intention is still to get the technology to the West. Then we do a proper patent and...
Analog Milliamp Meter Used as Voltmeter circuit
A milliamp meter can be used as a volt meter by adding a series resistance. The resistance needed is the full scale voltage reading divided by the full scale current of the meter movement. So, if you have a 1 milliamp meter and you want to read 0-10 volts you will need a total resistance of 10/.001 = 10K ohms..
Watch the video given below to get a better idea on how LED works A light emitting diode (LED) is known to be one of the best optoelectronic devices out of the lot. The device is capable of emitting a fairly narrow bandwidth of visible or invisible light when its internal diode junction attains a forward electric current or voltage. The visible l
Simple Lamp Dimmer/ Fan Regulator Circuit
A fan regulator circuit which can also be used as a simple lamp dimmer circuit.This fan speed regulator or light dimmer is based on power control using triac..
RPM switch for 6th ports or VDI
A circuit diagram for an adjustable rpm switch. It ’s something you can use to activate solenoids for auxiliary ports, VDI, shift light, or anything else you can think of. The circuit is adapted from a rev-limiter circuit for rotaries. In particular, I ’d like to thank Rob Weinstock from the fc3s. org list for his help tweaking it.
How to connect a crystal oscillator to generate Square wave
If you want a 1MHz square wave, I would suggest using a higher frequency crystal and dividing it down, for two reasons: (1) 4MHz crystals are apt to be cheaper and easier to find than 1MHz ones; (2) Getting a 50. 0000% duty cycle from a crystal is a bit tricky; by contrast, if one converts the signal from a crystal into a pulse wave (just pass...
RC Servo Switcher
Lead Acid Chargers
A Better Shade of Green
A Simple yet Versatile Dimming-Ballast Solution for Low-Energy Lighting EU-wide legislation promoting use of Compact Fluorescent lamps (CFLs) in place of incandescent bulbs could save as much..
The 60 Hz Frequency Generator circuit is very urgently needed to make the inverter or hardware related to the AC current voltage. This 60 Hz Frequency Generator is very simple and has a high accuration, the squarewave as the output which is precision. The heart of this 60 Hz Frequency Generator is IC CD4060 as the IC Counter / Divider and also cou
Earth brand electric schematic diagram and operating principle of Model TJ30 3KW A.C. voltage stabilizer
Very Simple Oscillator
This is the first oscillator I ever built. I remember looking at books and magazines, schematics on the net, etc. They wereall either colpitt or hartley oscillators. Generally speaking while they`re simple enough, they require the use of properinductors which is something that usually you don`t have when you`re just starting out or you can`t measu
Foggers used to generate fog and smoke effects operate by heating a special fogger fluid. They consist of a heting element which is kept in the right temperature using a thermostat. When the operator want to generate smoke, he/she presses the controller button which starts the pump which pumps fog fluid to the heating element. When smoke fluid ent
88 108 mhz pll controller for fm
This circuit will explain the PLL controller unit for the FM transmitter. It is very important since the transmitter frequency is digitally controlled and thereby very stable. The heart of this unit is a PIC processor called PIC16F870, a 2 x 16 char display and four buttons. If jumper J1 is disconnected the LCD will have soft backlight because a l
An unconventional, scalable high efficiency 12V solar power system and battery charge controller withlow voltage cutout to protect thebattery. (ideal for systems of 50W or less) This circuit was designed for small to medium lead acid systems and feature a lowish idle current ( 5mA ) which increases battery life on small capacity systems. All the p
Water Level Sensor/Detector/Monitor With Alarm
This schematic diagram shows a water level sensor/detector/monitor circuit. An alarm is also featured in this circuit. Any fluid with a resistance under 900K..
Voltage Controlled Switch using 555 Timer
In this circuit the 555 timer is used in a novel way, as a voltage controlled switch.The old and omnipresent NE555 can be very good at someth..
power electronics converter simulation in proteus
hi here is new models 3 digit cc and ca dispaly multiplexed 3 didgit voltmeter chip TC7107(ICL7107) Thumb switch with commom pin bcd and hex regards..
how to build digital step km counter
This circuit measures the distance covered during a walk. Hardware is located in a small box slipped in pants` pocket and the display is conceived in the following manner: the leftmost display D2 (the most significant digit) shows 0 to 9 Km. and its dot is always on to separate Km. from hm. The rightmost display D1 (the least significant digit) sh
Robot control circuit composed of transistor and NE555
Figure 2-33 (a) is the action schematic diagram of the robot closing to the object. When there is no objects in front of the robot, it will go forward in the straight line; when there is an object in left or right side of the robot,it will turn left or right to close to the object. Figure 2-33 (b) is the block diagram to achieve this action....
This page was created in response to all the email I receive, on how to read a schematic. Learning to read a schematic diagram, is similar to map reading. You need to know which wires connect to which component and where each wire starts and finishes. With a map book this would be equivalent to knowing your origin and destination points and which
60W Guitar Amplifiers
This design adopts a well established circuit topology for the power amplifier, using a single-rail supply of about 60V and capacitor-coupling for the speaker(s). The advantages for a guitar amplifier are the very simple circuitry, even for comparatively high power outputs, and a certain built-in degree of loudspeaker protection, due to capacitor
Quartz crystal tester circuit
This a very simple and inexpensive circuit that can be used to test quartz crystals. Here a Colpitts oscillator is wired used the transistor T1. When the crystal is connected between terminals A and B the circuit will produce high frequency oscillation. The oscillations will be generated only if the crystal is a good one. The diode OA91 will...
The Tayloe Mixer A Low Noise Solution
The intelligent temperature sensor DS18S20 from Dallas semiconductor is a calibrated precise two resp. three pin device that interfaces direchtly to microcontrollers or PCs producing Celsius readings. The so-called 1-wire protocoll (better "one DATA wire. ) can be adapted to the RS232 port with minimal component count. Simple circuits are publishe
5W dual output DC DC converter powers rugged military apps