New Circuits Page 39
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Designing a true constant-current AA NiMH charger, and want to select a power supply that will be just right. I want a high enough voltage to that the CC transistor doesn`t saturate, yet low enough voltage to reduce the power dissipation in the transistor. I....
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A very simple and useful electronic bell circuit can be made using this schematic circuit diagram. This electronic bell circuit can be used as an doorbell or even for an alarm circuit . This electronic bell circuit use just few transistors and other few....
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In previous article about the Atmel AVR We have only blinked with LEDs, without influence of events outside the microprocessor. All ports operated only as outputs, there was no input. Now we will show how to connect control buttons to the microcontroller and....
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h5. INTRODUCTION Digital to analog converters are one of the most commonly employed circuits in many applications involving digital video, signal processing, test e....
-
I decided to build an infra-red object detection system using High Output IR LEDs. For the controller of the robot I used the Parallax BASIC Stamp I. The latest greatest version of the software, at least as of 10/9/98, gives IRBOT three modes of operation.....
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Here the schematic diagram of 100W Inverter Circuit which will convert 12VDC input to be 220VAC output. The circuit built based IC CD4047 to generate sine wave signal 50Hz and then the power transistor 2N3055 will boost the signal so that the signal have....
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-
Time delay circuit using a UJT. Maximum time delay is set by the 10M pot. Time delay can be set from less than a second to approximately 2. 5 minutes (courtesy Motorola Semiconductor Products Inc. ). ..
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The following diagram is the schematic diagram of Active Tone Control circuit, or we often call thic circuit as "ACTOR" Active Tone Control or ACTOR is a electronic audio circuit that serves to increase the Loudness (Bass and Treble audio signal) is active....
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In addition to providing an accurate input current limit, the LT1618 can also be used to provide a regulated output current for current-source applications. White LED drivers are one such application for which the LT1618 is ideally suited. With an input....
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Here is a schematic that I need help understanding- On this circuit I`m assuming pin 2 is connected by a wire to pin 6 even though it doesn`t make....
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So you`re either revved up about building one of these for yourself or you`re just reading on because you`ve nothing better to do. I can understand that. So let`s begin with a set of schematics: Don`t be confused by this - it`s your basic 555 timer....
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2000 Plymouth Breeze Dash Light Wiring Diagram...
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Just point this small device at the TV and the remote gets jammed. The circuit is self explanatory. 555 is wired as an astable multivibrator for a frequency of nearly 38 kHz. This is the frequency at which most of the modern TVs receive the IR beam. The....
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This easy to construct “Handy pen torch†electronic circuit and low component count, uses two power white LEDs for lighting. Low volt (4.8V dc) supply ava....
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This is a simple microphone preamplifer circuit which you can use betw1een your microphone and stereo amplifier. This circuit amplifier microphone suitable for use with normal home stereo amplifier line/CD/aux/tape inputs. This mic preamp can take both....
-
My original BFO, a small EICO 330 solid state signal generator, served well to bring in a variety of distant LW beacons. In late-2004/early-2005, a new One-Active Device (1-AD) contest to complement the Crystal Set DX contest was announced. Steve McDonald....
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This circuit is intended to let the user turn off a lamp by means of a switch placed far from bed, allowing him enough time to lie down before the lamp really switches off. Due to the low current drawing, the circuit can be supplied from 220Vac mains without....
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This project describes how to make a digital voltmeter with a PIC microcontroller. A character based on HD44780 LCD display is used to measure voltage. The PIC microcontroller used in this project is PIC16F688, which has 12 I / O pins of which 8 can be used....
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Controlling devices using switches are common. From a few decades controlling devices using remote control switches like infrared remote control switch, wireless remote control switches, light activated switches are becoming popular. But these technologies....
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This varactorless high frequency modulator electronic project, must be powered from a simple DC 3 volt power source ( you can use a 3 volt battery). Traditionally, high-frequency oscillators are frequency-modulated by using a varactor. However, varactors....
-
The circuit of AM transmitter is designed to transmit (amplitude modulated) DSB (double side band) signals. A modulated AM signal consists of a carrier and two symetrically spaced side bands. The two side bands have the same amplitude and carry the same....
-
The transmitter ambit declared actuality has an added RF ability amplifier stage, afterwards the oscillator stage, to accession the ability achievement to 200-250 milliwatts. With a acceptable analogous 50-ohm arena even antenna or multi-element Yagi....
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Typically a synchronous camera flash (e. g. slave flash) is triggered via an SCR. In this blog post, I will show you a circuit that can be used to trigger a secondary camera flash using an IGBT. Using an IGBT for camera flash triggering has several....
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The Q-Switch driver for an old Yag laser died. A replacement was >$1000 so we built our own for = 20W into a 50 ohm load at 68MHz. The rep rate had to be adjustable between 100Hz and 100KHz and have a TTL output to synchronize the output with other....
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The project†DIY: build sound activated switch†presented here is pretty easy to construct and can prove to be very useful in protecting a particular area from a possible theft or intrusion. Learn how to build a simple sound activated alarm here on....
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GPS modem is a device which receives signals from satellite and provides information about latitude, longitude, altitude, time etc. The GPS navigator is more famous in mobiles to track the road maps. The GPS modem has an antenna which receives the satellite....
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This circuit enables you to display four signals simultaneously using only one channel of your oscilloscope. Essentially, it switches each of the inputs through to the output in turn, with some signal massaging in between. As shown, it is suitable only for....
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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....
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Doing a project on GSM. In that i want to detect the key pressed at the other side on active call. I am trying with a dtmf decoder circuit at speaker output but it is not working. Plz if any one has any other idea or solution plz reply...
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-
This application note describes a low cost, high performance UHF short-range Radio ASK receiver design using the Microchip Technology rfRXD0420. The reference design is suitable for: Wireless remote command and control Remote Keyless Entry (RKE) Security....
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Hack the pitch shift of the crash and ride by lifting pin 10 of the TC4040 binary counter and insert your own clock in (or just whack it with an additional clock source). This could be any suitable signal you pick up from the TR itself. The other sounds do....
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-
At the heart of this over heat detector circuit is a precision integrated temperature sensor type LM35 (IC1), which provides an accurately linear and directly proportional output in mV, over the zero to +155 degrees C temperature range. The LM35 develops an....
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Quartz crystal tester is needed if you want to know whether the crystal is good or bad (broken). This crystal tester gives LED light indicator. If the....
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In the some building is need to using good security. For some example is using this design circuit. The door knock alarm is a simple design for the simple security for the house. This circuit is based by sensor piezoelectric wafer for detected the alarm.....
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The GPS Car or Boat Computer can display a wide range of GPS related information for the driving or boating enthusiast. In this page you will find everything that you need to know to build the unit. This includes the design, schematic, parts list, PC board....
-
A dual tone model train horn/sound generator/simulator circuit can be made using two NE 555 timers connected in cascade. But here circuit diagram is designed with NE 556 IC, which is nothing but two 555 in one package....
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The following circuit shows about Touch Switch Circuit Diagram . This circuit based on the CD4011 IC. Features: R1 and R2, the logic gates of the ....
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This circuit shows a Wiper Speed Control Circuit Diagram. Sweeping rate of the wiper can varying from once a second to once in ten seconds. This ....
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Using a triangle wave and a comparator, a pulse-width modulated signal can be created. We will use the DAC as our input signal and the resulting output signal will have a duty cycle that is proportional to the input voltage. We will then use the PWM signal....
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Variable AC Power Supply Circuit. In electronics, it is often handy to have a fully isolated variable AC power supply. With such a device you can safely test various AC powered circuits and...
-
-
The principle of operation of the proposed metal detector circuit is quite basic yet very interesting. The detecting function is triggered by sensing the decrease in the Q level of the LC network associated with the circuit in the presence of a metal at a....
-
Color sensor. Colour sensor is an interesting project for hobbyists. The cir- cuit can sense eight colours, i.e. blue, green and red (primary colours); magenta, yellow...
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This temperature controlled relay circuit is a simple yet highly accurate thermal control circuit which can be used in applications where automatic tempera....
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A simple direct coupled radio circuit diagram and schematic, ideal for adjacent stations.This circuit uses Q1 as audio amplifier and base emitter capacitance provides radio filtering....
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This heat detector alarm electronic project is designed using the UM3561 sound generator circuit and some other common electronic parts. This heat detector circuit project uses a complementary pair comprising npn and pnp transistor to detect heat. When the....
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This is a common control voltage in industrial and telecommunications equipment, so the relays are common in surplus equipment. Many will actuate equally well on AC or DC, which makes them an easy solution when the control voltage is switched mechancially,....
-
Protect your valuable laptop against theft using this miniature alarm generator. Fixed in-side the laptop case, it will sound a loud alarm when someone tries to take the laptop. This highly sensitive circuit uses a homemade tilt switch to activate the alarm....
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Figure 1 is AND gate logic circuit. Its logic expression is P=A, Figure B has 2 photodiodes in series. When input logic level A=1, B=1, output P=1. In a similar way, itcan form Or gate, NAND gate, NOR gate and some other logic circuits. As shown in figure 2,....
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This circuit is used to simulate the police car lights by alternating flashing strobes seen on British police cars. The IC1a forms a square wave oscillator having adjustable frequency with VR1 to give the best effect. This square wave is buffered by IC1b and....
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Connect eight LEDs to an Arduino and make a Knight Rider display using only two Arduino pins in this tutorial. This is made possible by using a PCF8574 I/O expander IC....
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Smoke and fire alarms are an important part of your home`s safety plan and careful attention must be made to proper fire alarm installation and wiring. The information below will provide some basic guidelines for installing a fire alarm system in your new....
-
This set of two circuits from the basis for a very simple light wave transmitter. A LASER beam is modulated and then aimed at a receiver that demodulates the signal and then presents the information (voice, data, etc. ). The whole thing is very easy to build....
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The picture shows the proximity switch circuit composed of the HMC1001 and operational amplifier (AMP04) and light emitting diode (LED). The operational amplifier is used as a comparator here. If taking a magnet with length about 6mm~12mm to close to the....
-
The principle is that there is a certain parasite capacitance between coil windings, which stores a certain amount of energy. By winding the coil bifilar, you get substantial bigger voltage differences between adjacent windings and therefore more energy is....
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This is a SCR timer circuit. Here, SCR is used to drive the final actuator, the buzzer. The time constanst of this circuit is determined by R1 and C1. The buzzer will sound when C1 charges up to a desired level, it will cause the Q1 to conduct and triggers....
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-
A low noise circuit equipped with a variable voltage-gain (10 - 100) pre-set, primarily intended as high quality microphone input, also suitable for low-level line input. Tone Control Module: a three-band (Bass, Middle, Treble) tone control circuit providing....
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I had never worked with " common base" or "grounded base" designs before and you know, I still don`t understand how they can amplify. Another thing, I had never used a bipolar transistor in a regenerative stage before, but had read that the amplification....
-
The heart of the circuit is IC2, a 50240 top-octave generator. That device uses a single input-frequency to generate all twelve notes of the musical scale. The input signal is provided by IC1, a 4001 quad 2-input NOR gate. Two sections of that IC are used to....
-
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....
-
The following circuit shows about Plant Moisture Meter Circuit Diagram. This circuit based on the LM741 IC. Features: meter indicate whether it is ....
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Why measure the temperature of the coffee? Well, coffee taste depends on two things. First, how strong the coffee is and second, how hot it is. The second...
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Modify it to click and latch a relay when i press the button from any ware in the house. Also if it is somehow possible unlatch the relay when pressed again. Im sure you know what i mean. I was looking at it, all i think i have to do is create some sort of....
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The circuit of Fig. 1 provides an easy yet reliable way to detect the intensity of a. c. (or e. l. f. ) fields around the home or workplace. It is doubly effective because it does not merely detect the electromagnetic radiation emitted by electrical....
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By designing a current difference buffer amplifier (CDBA) circuit for fabrication in a commercial CMOS semiconductor process, the versatility of this component can be applied in a variety of applications....
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-
This project uses a magnetic reed switch, a NerdKit, and set of computer speakers to frighten unsuspecting visitors at the door. In covering constructing this project, we get a chance to go over some pretty neat engineering concepts: digital audio, data....
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A simple meter to check the balance of currents running in the two legs of a transmission line. It can be used to check the balance of currents between the inner conductor and the outer coaxial conductor in a coax cable as well as between the legs of an open....
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A simple single player PONG game using a LED matrix while thinking about how the sync signals logically worked together in the Analog Pong Game I had built. I originally wanted a 10X10 matrix for the ball, and tried to think of some chips capable of counting....
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Only with a single chip active component (4069 IC), this circuit will convert sine to square waves without a power-source. To test some audio instruments, we....
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In a grid driven amplifier it is necessary to match the low impedance of the driving transmitter (typically 50 ohms) to the high impedance input of the tube (typically several thousand to several million ohms). The signal from the input jack travels via....
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This circuit will produce sine, square, and triangle waves from 0. 1 Hz to 1 MHz and has a counter which will read the frequency of the function generator or an external signal of a few volts peak-to-peak that will drive the CMOS counter. ..
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This is speed motor controller circuit of 12V DC motor. You can adjust the speed of rotation of the spindle motor from 5-60 cycles per minute. The work of....
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Circuit diagram is a very simple circuit-level indication, with 10 Led. Used a series of half-wave rectification of precision around IC2 TL071, with a single. LM3915 IC is used to control the led, as an indicator VU Meter. LM3915 can be controlled 10 led..
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This circuit is FM radio receiver that very small size and works well, although the sensitivity is poor. The principle of this circuit is to use the generator....
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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....
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The ZN414 is a low cost, single-chip AM radio integrated circuit. Launched in 1972, the part was designed and supplied by Ferranti. Receiver CircuitThe TDA7000 is a monolithic integrated circuit for mono FM portable radios or receivers where a minimum. Take....
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Below that is the clock section. The knob controls the internal oscillator`s speed, and that can be voltage-controlled via the `Speed In` input. Or, you can insert your own clock signal via the `Clock In`. This is slightly unusual, but I think having the....
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Small simple audio mixer with a few components around one FET transistor (2N3819)....
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Article shows how to add an NPN transistor and few external components to a shunt regulator to create inexpensive LDO. Tiny LDO uses no output capacitors and provides up to 2A output current....
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This is a very simple, low cost, Hi-Fi quality power amplifier. You can build it 5 ways, like it?s shown in the table (from 20 W to 80 W RMS)....
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A pic programmer circuit that works using long cables from PC to programmer....
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This is a schematic for radio receiver circuit. This circuit is based on the TDA7088T that can be used in mono portable and pocket radios. This is a bipolar integrated circuit. This is the figure of the circuit; When a minimum of peripheral components (of....
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With 4 batteries (as for instance in the flashlight) it is possible to produce per hour hydrogen and oxygen in a quantity which corresponds to regular grade fuel in approximately 42 litres. Until the batteries are exhausted, they produced for calorific....
Designing a true constant-current AA NiMH charger, and want to select a power supply that will be just right. I want a high enough voltage to that the CC transistor doesn`t saturate, yet low enough voltage to reduce the power dissipation in the transistor. I....
A very simple and useful electronic bell circuit can be made using this schematic circuit diagram. This electronic bell circuit can be used as an doorbell or even for an alarm circuit . This electronic bell circuit use just few transistors and other few....
In previous article about the Atmel AVR We have only blinked with LEDs, without influence of events outside the microprocessor. All ports operated only as outputs, there was no input. Now we will show how to connect control buttons to the microcontroller and....
h5. INTRODUCTION Digital to analog converters are one of the most commonly employed circuits in many applications involving digital video, signal processing, test e....
I decided to build an infra-red object detection system using High Output IR LEDs. For the controller of the robot I used the Parallax BASIC Stamp I. The latest greatest version of the software, at least as of 10/9/98, gives IRBOT three modes of operation.....
Here the schematic diagram of 100W Inverter Circuit which will convert 12VDC input to be 220VAC output. The circuit built based IC CD4047 to generate sine wave signal 50Hz and then the power transistor 2N3055 will boost the signal so that the signal have....
Time delay circuit using a UJT. Maximum time delay is set by the 10M pot. Time delay can be set from less than a second to approximately 2. 5 minutes (courtesy Motorola Semiconductor Products Inc. ). ..
The following diagram is the schematic diagram of Active Tone Control circuit, or we often call thic circuit as "ACTOR" Active Tone Control or ACTOR is a electronic audio circuit that serves to increase the Loudness (Bass and Treble audio signal) is active....
In addition to providing an accurate input current limit, the LT1618 can also be used to provide a regulated output current for current-source applications. White LED drivers are one such application for which the LT1618 is ideally suited. With an input....
Here is a schematic that I need help understanding- On this circuit I`m assuming pin 2 is connected by a wire to pin 6 even though it doesn`t make....
So you`re either revved up about building one of these for yourself or you`re just reading on because you`ve nothing better to do. I can understand that. So let`s begin with a set of schematics: Don`t be confused by this - it`s your basic 555 timer....
Just point this small device at the TV and the remote gets jammed. The circuit is self explanatory. 555 is wired as an astable multivibrator for a frequency of nearly 38 kHz. This is the frequency at which most of the modern TVs receive the IR beam. The....
This easy to construct “Handy pen torch†electronic circuit and low component count, uses two power white LEDs for lighting. Low volt (4.8V dc) supply ava....
This is a simple microphone preamplifer circuit which you can use betw1een your microphone and stereo amplifier. This circuit amplifier microphone suitable for use with normal home stereo amplifier line/CD/aux/tape inputs. This mic preamp can take both....
My original BFO, a small EICO 330 solid state signal generator, served well to bring in a variety of distant LW beacons. In late-2004/early-2005, a new One-Active Device (1-AD) contest to complement the Crystal Set DX contest was announced. Steve McDonald....
This circuit is intended to let the user turn off a lamp by means of a switch placed far from bed, allowing him enough time to lie down before the lamp really switches off. Due to the low current drawing, the circuit can be supplied from 220Vac mains without....
This project describes how to make a digital voltmeter with a PIC microcontroller. A character based on HD44780 LCD display is used to measure voltage. The PIC microcontroller used in this project is PIC16F688, which has 12 I / O pins of which 8 can be used....
Controlling devices using switches are common. From a few decades controlling devices using remote control switches like infrared remote control switch, wireless remote control switches, light activated switches are becoming popular. But these technologies....
This varactorless high frequency modulator electronic project, must be powered from a simple DC 3 volt power source ( you can use a 3 volt battery). Traditionally, high-frequency oscillators are frequency-modulated by using a varactor. However, varactors....
The circuit of AM transmitter is designed to transmit (amplitude modulated) DSB (double side band) signals. A modulated AM signal consists of a carrier and two symetrically spaced side bands. The two side bands have the same amplitude and carry the same....
The transmitter ambit declared actuality has an added RF ability amplifier stage, afterwards the oscillator stage, to accession the ability achievement to 200-250 milliwatts. With a acceptable analogous 50-ohm arena even antenna or multi-element Yagi....
Typically a synchronous camera flash (e. g. slave flash) is triggered via an SCR. In this blog post, I will show you a circuit that can be used to trigger a secondary camera flash using an IGBT. Using an IGBT for camera flash triggering has several....
The Q-Switch driver for an old Yag laser died. A replacement was >$1000 so we built our own for = 20W into a 50 ohm load at 68MHz. The rep rate had to be adjustable between 100Hz and 100KHz and have a TTL output to synchronize the output with other....
The project†DIY: build sound activated switch†presented here is pretty easy to construct and can prove to be very useful in protecting a particular area from a possible theft or intrusion. Learn how to build a simple sound activated alarm here on....
GPS modem is a device which receives signals from satellite and provides information about latitude, longitude, altitude, time etc. The GPS navigator is more famous in mobiles to track the road maps. The GPS modem has an antenna which receives the satellite....
This circuit enables you to display four signals simultaneously using only one channel of your oscilloscope. Essentially, it switches each of the inputs through to the output in turn, with some signal massaging in between. As shown, it is suitable only for....
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....
Doing a project on GSM. In that i want to detect the key pressed at the other side on active call. I am trying with a dtmf decoder circuit at speaker output but it is not working. Plz if any one has any other idea or solution plz reply...
This application note describes a low cost, high performance UHF short-range Radio ASK receiver design using the Microchip Technology rfRXD0420. The reference design is suitable for: Wireless remote command and control Remote Keyless Entry (RKE) Security....
Hack the pitch shift of the crash and ride by lifting pin 10 of the TC4040 binary counter and insert your own clock in (or just whack it with an additional clock source). This could be any suitable signal you pick up from the TR itself. The other sounds do....
At the heart of this over heat detector circuit is a precision integrated temperature sensor type LM35 (IC1), which provides an accurately linear and directly proportional output in mV, over the zero to +155 degrees C temperature range. The LM35 develops an....
Quartz crystal tester is needed if you want to know whether the crystal is good or bad (broken). This crystal tester gives LED light indicator. If the....
In the some building is need to using good security. For some example is using this design circuit. The door knock alarm is a simple design for the simple security for the house. This circuit is based by sensor piezoelectric wafer for detected the alarm.....
The GPS Car or Boat Computer can display a wide range of GPS related information for the driving or boating enthusiast. In this page you will find everything that you need to know to build the unit. This includes the design, schematic, parts list, PC board....
A dual tone model train horn/sound generator/simulator circuit can be made using two NE 555 timers connected in cascade. But here circuit diagram is designed with NE 556 IC, which is nothing but two 555 in one package....
The following circuit shows about Touch Switch Circuit Diagram . This circuit based on the CD4011 IC. Features: R1 and R2, the logic gates of the ....
This circuit shows a Wiper Speed Control Circuit Diagram. Sweeping rate of the wiper can varying from once a second to once in ten seconds. This ....
Using a triangle wave and a comparator, a pulse-width modulated signal can be created. We will use the DAC as our input signal and the resulting output signal will have a duty cycle that is proportional to the input voltage. We will then use the PWM signal....
Variable AC Power Supply Circuit. In electronics, it is often handy to have a fully isolated variable AC power supply. With such a device you can safely test various AC powered circuits and...
The principle of operation of the proposed metal detector circuit is quite basic yet very interesting. The detecting function is triggered by sensing the decrease in the Q level of the LC network associated with the circuit in the presence of a metal at a....
Color sensor. Colour sensor is an interesting project for hobbyists. The cir- cuit can sense eight colours, i.e. blue, green and red (primary colours); magenta, yellow...
This temperature controlled relay circuit is a simple yet highly accurate thermal control circuit which can be used in applications where automatic tempera....
A simple direct coupled radio circuit diagram and schematic, ideal for adjacent stations.This circuit uses Q1 as audio amplifier and base emitter capacitance provides radio filtering....
This heat detector alarm electronic project is designed using the UM3561 sound generator circuit and some other common electronic parts. This heat detector circuit project uses a complementary pair comprising npn and pnp transistor to detect heat. When the....
This is a common control voltage in industrial and telecommunications equipment, so the relays are common in surplus equipment. Many will actuate equally well on AC or DC, which makes them an easy solution when the control voltage is switched mechancially,....
Protect your valuable laptop against theft using this miniature alarm generator. Fixed in-side the laptop case, it will sound a loud alarm when someone tries to take the laptop. This highly sensitive circuit uses a homemade tilt switch to activate the alarm....
Figure 1 is AND gate logic circuit. Its logic expression is P=A, Figure B has 2 photodiodes in series. When input logic level A=1, B=1, output P=1. In a similar way, itcan form Or gate, NAND gate, NOR gate and some other logic circuits. As shown in figure 2,....
This circuit is used to simulate the police car lights by alternating flashing strobes seen on British police cars. The IC1a forms a square wave oscillator having adjustable frequency with VR1 to give the best effect. This square wave is buffered by IC1b and....
Connect eight LEDs to an Arduino and make a Knight Rider display using only two Arduino pins in this tutorial. This is made possible by using a PCF8574 I/O expander IC....
Smoke and fire alarms are an important part of your home`s safety plan and careful attention must be made to proper fire alarm installation and wiring. The information below will provide some basic guidelines for installing a fire alarm system in your new....
This set of two circuits from the basis for a very simple light wave transmitter. A LASER beam is modulated and then aimed at a receiver that demodulates the signal and then presents the information (voice, data, etc. ). The whole thing is very easy to build....
The picture shows the proximity switch circuit composed of the HMC1001 and operational amplifier (AMP04) and light emitting diode (LED). The operational amplifier is used as a comparator here. If taking a magnet with length about 6mm~12mm to close to the....
The principle is that there is a certain parasite capacitance between coil windings, which stores a certain amount of energy. By winding the coil bifilar, you get substantial bigger voltage differences between adjacent windings and therefore more energy is....
This is a SCR timer circuit. Here, SCR is used to drive the final actuator, the buzzer. The time constanst of this circuit is determined by R1 and C1. The buzzer will sound when C1 charges up to a desired level, it will cause the Q1 to conduct and triggers....
A low noise circuit equipped with a variable voltage-gain (10 - 100) pre-set, primarily intended as high quality microphone input, also suitable for low-level line input. Tone Control Module: a three-band (Bass, Middle, Treble) tone control circuit providing....
I had never worked with " common base" or "grounded base" designs before and you know, I still don`t understand how they can amplify. Another thing, I had never used a bipolar transistor in a regenerative stage before, but had read that the amplification....
The heart of the circuit is IC2, a 50240 top-octave generator. That device uses a single input-frequency to generate all twelve notes of the musical scale. The input signal is provided by IC1, a 4001 quad 2-input NOR gate. Two sections of that IC are used to....
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....
The following circuit shows about Plant Moisture Meter Circuit Diagram. This circuit based on the LM741 IC. Features: meter indicate whether it is ....
Why measure the temperature of the coffee? Well, coffee taste depends on two things. First, how strong the coffee is and second, how hot it is. The second...
Modify it to click and latch a relay when i press the button from any ware in the house. Also if it is somehow possible unlatch the relay when pressed again. Im sure you know what i mean. I was looking at it, all i think i have to do is create some sort of....
The circuit of Fig. 1 provides an easy yet reliable way to detect the intensity of a. c. (or e. l. f. ) fields around the home or workplace. It is doubly effective because it does not merely detect the electromagnetic radiation emitted by electrical....
By designing a current difference buffer amplifier (CDBA) circuit for fabrication in a commercial CMOS semiconductor process, the versatility of this component can be applied in a variety of applications....
This project uses a magnetic reed switch, a NerdKit, and set of computer speakers to frighten unsuspecting visitors at the door. In covering constructing this project, we get a chance to go over some pretty neat engineering concepts: digital audio, data....
A simple meter to check the balance of currents running in the two legs of a transmission line. It can be used to check the balance of currents between the inner conductor and the outer coaxial conductor in a coax cable as well as between the legs of an open....
A simple single player PONG game using a LED matrix while thinking about how the sync signals logically worked together in the Analog Pong Game I had built. I originally wanted a 10X10 matrix for the ball, and tried to think of some chips capable of counting....
Only with a single chip active component (4069 IC), this circuit will convert sine to square waves without a power-source. To test some audio instruments, we....
In a grid driven amplifier it is necessary to match the low impedance of the driving transmitter (typically 50 ohms) to the high impedance input of the tube (typically several thousand to several million ohms). The signal from the input jack travels via....
This circuit will produce sine, square, and triangle waves from 0. 1 Hz to 1 MHz and has a counter which will read the frequency of the function generator or an external signal of a few volts peak-to-peak that will drive the CMOS counter. ..
This is speed motor controller circuit of 12V DC motor. You can adjust the speed of rotation of the spindle motor from 5-60 cycles per minute. The work of....
Circuit diagram is a very simple circuit-level indication, with 10 Led. Used a series of half-wave rectification of precision around IC2 TL071, with a single. LM3915 IC is used to control the led, as an indicator VU Meter. LM3915 can be controlled 10 led..
This circuit is FM radio receiver that very small size and works well, although the sensitivity is poor. The principle of this circuit is to use the generator....
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....
The ZN414 is a low cost, single-chip AM radio integrated circuit. Launched in 1972, the part was designed and supplied by Ferranti. Receiver CircuitThe TDA7000 is a monolithic integrated circuit for mono FM portable radios or receivers where a minimum. Take....
Below that is the clock section. The knob controls the internal oscillator`s speed, and that can be voltage-controlled via the `Speed In` input. Or, you can insert your own clock signal via the `Clock In`. This is slightly unusual, but I think having the....
Small simple audio mixer with a few components around one FET transistor (2N3819)....
Article shows how to add an NPN transistor and few external components to a shunt regulator to create inexpensive LDO. Tiny LDO uses no output capacitors and provides up to 2A output current....
This is a very simple, low cost, Hi-Fi quality power amplifier. You can build it 5 ways, like it?s shown in the table (from 20 W to 80 W RMS)....
A pic programmer circuit that works using long cables from PC to programmer....
This is a schematic for radio receiver circuit. This circuit is based on the TDA7088T that can be used in mono portable and pocket radios. This is a bipolar integrated circuit. This is the figure of the circuit; When a minimum of peripheral components (of....
With 4 batteries (as for instance in the flashlight) it is possible to produce per hour hydrogen and oxygen in a quantity which corresponds to regular grade fuel in approximately 42 litres. Until the batteries are exhausted, they produced for calorific....
