New Circuits Page 193
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A circuit diagram for driving a plasma-type display using ICL7135 is shown in the following schematic. This application is one of the wide versatility variety of this integrating Analog to Digital Converter device..
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This circuit controls the switching of the street light or porch light and it will be automated. This circuit of automatic lamp controller using 7806 regulator IC can be used to automate street lights, tube lights or any other house electrical lightning....
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If you refer to the above schematic, you`ll notice that the VGA-to-Scope converter has been simplified, while op-amp buffers and inverters were simply eliminated. The continuous current supply to charge up the capacitor can be replaced by a 1Meg pot from 5V....
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The 555 frequency can be varied via adjusting the voltage at pin 5. However, the range and linearity of frequency adjustment is very limited. This is a way to greatly improve performance using the inverted 555 timer circuit that was previously posted. Q2 is....
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The LM3445 (datasheet) is an adaptive constant off-time AC/DC buck (step-down) constant current controller designed to be compatible with triac dimmers..
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The zener provides a constant voltage of 20 V to unijunction transistor Q1, except at the end of each half-cycle of the input when the line voltage drops to zero. Initially, the voltage across capacitor C1 is zero and capacitor C2 cannot charge to trigger....
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I`m making a small DC tesla coil with a rotating spark gap. The motor controlling the RSG draws about 3. 8 amps of current at full load, and the 555 control circuit and amp draws about 4 amps. Would it be best to run the motor and 555 circuit parallel from....
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AC to DC switching power adaptor circuit with maximum output power of 90W. Switching power supply is built using a high voltage power switching regulator IC MC33374 and some other additional components. The MC33374 IC is a monolithic high voltage power....
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With FET in one leg of Wheatstone bridge, meter has input impedance of over 1 megohm. With no input voltage, adjust R4 so meter reads zero. With 9-V battery, RI can be adjusted for full-scale meter reading of 8 V. With 12-V battery, meter range is 0-10 V.....
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The chart shows the Christmas lights circuit which uses simple, inexpensive CD4069 CMOS hex inverter to control four circuits with 200 light-emitting diodes (each circuit has 50 LEDs), and it is directly supplied by the 220V power source without power....
-
This is a car alarm simulator which using the LED as a simulation output. This simple circuit can tell you whether your car is running or not by detecting the voltage difference when the car is on and off. This occurs because when your car This is a car....
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-
This is a simplest circuit for 100 watt inverter for generating 220vAC from 12vDC. I say simplest because here in this inverter circuit a minimum number of components are used to design the schematic, which is quite difficult to make a circuit like this with....
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1500 Watt RF Amplifier circuit can be used to drive your transmitter antenna, it can also include driving to the source of the RF high power, microwave heating, and more...
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The ESR Meter is basically an AC Ohmmeter with special scales and protective circuitry. It provides a continuous reading of series resistance in electrolytic capacitors. It operates at 100 kHz to keep the capacitive reactance factor near zero. Here`s the....
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This melody generator can generate various English and Hindi tunes as also instrumental effects. Various modes of melodies can be selected through DIP switches. Other advantages are high volume and volume control. IC UM3481A is a 16-pin multi-instrument....
-
tuned-radio-frequency receiver. A radio receiver consisting of a number of amplifier stages that....
-
Is the battery empty, or is there something wrong with the device That`s always a difficult question when your walkman or some other battery-powered device appears to be dead when you switch it on. Before you take it to the shop for servicing, the first....
-
[The following circuit is adapted from battery monitors and testers published in The Smith-Kettlewell Technical File (SKTF). The first appearance of this system was "The Smith-Kettlewell Battery Tester, Where Silence is Golden", SKTF, Volume 11, No. 1,....
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-
The idea of a color organ is that any sound, including musical sound, can be transformed into light. As stated by wave theory, both music and light have....
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-
Classic 6-Transistor circuit (many variations of this where around in the 1960`s & 70`s), NPN only output devices, fairly high level of Bias, single rail, input and output coupled via a capacitors (electrolytics - no less), clever feedback loop, bootstrapped....
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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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This is a UHF oscillator circuit I designed to make use of the Mini-Circuits POS-400+ voltage controlled oscillator chip. By giving it a voltage from 0 to 12V on pin 8 it gives out a sine wave ranging from 200MHz to 380MHz on pin 2, though my testing with a....
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Rectifted and filtered voltage from the 24 Vac transformer is applied to the LM723 voltage regulator and the npn pass transistor set up for constant current supply. The 470 ohm resistor limits trickle current until the momentary pushbutton (S2) is depressed,....
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To activate the air muscle, valve labeled #2 is opened. This causes the air muscle to contract. Once activated the #2 valve may be closed without impacting on the state of the air muscle. The air muscle stays in a contracted state. To relax the air muscle,....
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This light activated relay circuit presented here uses the 555 timer IC and a light dependent resistor or LDR to form a light sensitive relay in an intruder alarm system or for switching on a lamp at Sun set and off at Sun rise. Potentiometer R1 value must....
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An electromagnetic generator without moving parts includes a permanent magnet and a magnetic core including first and second magnetic paths. A first input coil and a first output coil extend around portions of the first magnetic path, while a second input....
-
The familiar transistor power supply has one big mother of a filter capacitor on the rectifier output followed by an electronic regulator which regulates out all voltage variations including ripple. In vacuum tube days only the very tip top of the line test....
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The following circuit shows about PIC16F819 Dymoclock Sensor Circuit Diagram. Features: a cheap temperature sensor, only LEDs, no decoder, built ....
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Here is the circuit diagram of a 741 IC based 3 input mic mixer ckt. Altogether four 741 IC`s are used out of which IC1, IC2, and IC3...
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It plugs into the USB port and is just the shot for checking motherboard switch and jumper settings. Many readers will remember a commercial product of a....
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Make sure to double-check your connections using the circuit diagram and breadboard schematic (download from these links). You can use this while you....
-
I am interested in creating an interactive LED gameboard of some kind (or even a sort of "Stargate" DHD-type sci-fi prop!), where each square or tile is lit up from below by either a single white LED or an RGB combo. It always occurred to me that I`d love it....
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This wireless remote control switch production is relatively simple. All components parameters we are testing is complete. Reader component parameters we provide installation can be completed in the production of the first resistive and capacitive components....
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WHY is the voltage at 12V after the emitter If it`s coming out of the op amp at +15V, then that would put a 3volt drop across the transistor. and why isn`t the gain 2, shouldn`t there be 8 volts coming out to the transistor In that case wouldn`t a 4volt drop....
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The Hakkit robotics shield is a breakout kit for the Arduino Uno R3. When assembled the shield gives five standard servo headers taking advantage of the PWM pins on the Arduino and breaks out the analog pins to give six inputs for sensors. This shield is the....
-
This button, with a few hacks, now makes it so we can open up our office with our Nexus Ones, iPhones or even SMS. Located near the reception desk, this button opens an electronic latch on the front door. Pulling the assembly out of the wall revealed the....
-
The purpose of this document is to answer the question of why things are done in a certain way and why certain components are used instead of others. The circuit below is a representation drawing to be used for explanation, but with some refinement could be....
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A wide range frequency meter is an useful tool for an electronics lab. This projects describes a frequency meter based on AT90S231 microcontroller that can measure input frequencies up to 50 MHz. The measured frequency is displayed on 6 digit multiplexed....
-
PLL oscillator is used to get very stable frequency woth very low distortion of sine wave output. The stability is equal to crystal-based oscillator, and the low distortion level of the sine wave output is equal to LC based oscillator. The method ofPLL....
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Car Stereo Amplifier Circuit with TDA2040 is shown here. TDA2040 is a monolithic integrated audio amplifier operating in Class AB mode. The IC has built in short circuit protection circuitry and thermal very close and more about it can be operated from a....
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DC motor interfacing with microcontroller with the help of L293D H-bridge and trasistor based H-bridge. DC motor speed control using PWM. Interfacing DC motor with 8051, AVR, PIC microcontroller....
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There are some important considerations to using more memory, but it certainly is possible. the mp3 player project uses 32 megabytes! But using more memory requires careful consideration. The most important factor is that the 8051 processor has a 16 bit....
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I want to build a 2 phone intercom which can be used upto 1km using speaker of same phone to create ring on other side please help....
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Originally Posted by dscottguitars A rotary 3 position 3 pole switch. In one pole, through a cap out the other pole, no bleeding from one cap to the....
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This Keypad is suitable for the Modular Burglar Alarm. However, it has other applications. Entering the First Four Digits of your chosen Five-Digit code - will energize the relay. Entering the Full Five-Digit code - will de-energize it....
-
This circuit uses Invisible Infrared light to detect the movement of people through the door. A short beep will be generated when the infrared beam breaks..
-
This is a simple 12V rechargeable smart battery charger circuit. You can use this best battery charger circuit as car battery chargers, Inverter battery charger, Emergency light battery charger etc. An automatic indicator alarm circuit also comes along with....
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This article describes how to build a simple uC based delay circuit for photographic applications like drop or high speed photography. It can be used to control the trigger lag of cameras and flash units, generate a periodic trigger pulse or even control....
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The kit includes the following items (depending on which bootloader chip 16MHz or 8MHz) The kit includes the essential items to create your own Arduino 328 board. Here is a breadboard with all the components mounted and running the demo led flash program You....
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Simple voltage probe circuit shown in the schematic diagram below very useful in testing, testing, or troubleshooting discrete or integrated circuits,....
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This DIY 12V to 220V voltage converter is build with CMOS 4047 that is the main component of this small voltage converter that transforms a 12V DC into 220V AC. 4047 is used as a astable mutivibrator, at pins 10 and 11 will have a symmetrical rectangular....
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The circuit below is a one-shot multivibrator. One shot multivibrator is also known as monostable multivibrator, or timer. The main function of such circuit is....
-
Microcontrollers are integrated circuits which consists of microprocessor with additional units like memories, input/output units (peripherals), etc. With this way of implementation, microcontrollers provide savings in time and space, and of course money.....
-
This would be a lot easier with a display kit purchased from PJRC, which comes with the correct firmware installed on the display, a working pushbutton board, and the two cables needed. The PJRC display comes with a 4-pin plug that mates with the MP3 player,....
-
This ac to dc power supply can output 5A in continous operation and 12A peak current. This kind of dc power supplies uses a PCB so you can use two case typ...
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Provides overload and short-circuit protection for load while isolating malfunctioning circuit from other loads on common supply bus. In normal operation, Q1 is saturated. When load attempts to draw more than this saturation value, base current of Q1 cannot....
-
Advanced power control systems make use of electronic plans like Thyristors pro power switching, part control, grinder and so forth. These diplomacy and realize applications participating in inverter design, ability control in lamps, quickness control of....
-
Here is a simple tool to check the degree of radiation from an electric or electronic instrument. The LEDs in the circuit will give a running light pattern at the moment the circuit senses electromagnetic radiation from the device. It can detect radiation....
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-
-
Ensure 5/-5 dual supply for chip TL062 IC3. Gnd is common ps ground, let grounds radiate from ground plane in one side of PCB. R3-R8 is an attenuator that may need to be designed or modified. In output R23 is for protection from shorting of 5V supply, R23....
-
A useful timing strobe can be constructed using high-brightness LEDs and a few common components. Ignition pulses from the number 1 cylinder high-tension lead are used to trigger the circuit via a home-made inductive pickup. Transistors Q1 & Q2 buffer and....
-
The circuit timer with musical alarm use famous CMOS oscillator/divider IC (IC1 ). Although this circuit operates in 9V its standby current drain is very low. The time delay of timer circuit can be adjusted by adjusting the preset VR1. The base of npn....
-
The simplest I to V converter is the humble resistor. However, presenting a nonzero impedance to the source of input current is the disadvantage of the humble...
-
This FM spy telephone circuit is mounted serial with the phone line. When is signal on the wires this transmitter will radiate airwaves thru the wires which act as antenna. There is no need for batteries because it got his voltage supply from the phone....
-
Simple instrumentation amplifier circuit diagram using opamp. Equation for gain, design.Working and construction also provided....
-
Its main feature is a selection of outputs at standard fixed voltages used in electronics. Because the outputs are fixed you do not have to worry if the voltage is correct, you just plug the wire in. It is quick and easy to use. You will probably still need....
-
This extremely simple FM radio receiver circuit is made possible by the special purpose TDA7000 IC. It integrates nearly all the functions necessary to build an FM receiver needing only a few external capacitors and a tuning circuit. Using a simple active RC....
-
Sine-wave generator produces Walsh-function approximation of sine function. Frequency of sine wave is set by square-wave input to pin 14 of 7493. Filter com ponents of opamp help smooth staircase wave form generated by summing Walsh-function components as....
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Summing amplifier or an adder is used to sum two signal voltages. Voltage adder circuit is a simple circuit that enables you to add several signals together. It has wide variety of applications in electronic circuits. For example, on a precision amplifier,....
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The power supply has been simplified- Power transformers and rectifiers have been omitted and some parts have been omitted from the MOSFET voltage regulator circuits: 1N5242 zener diodes between the source and gate and 10k resistors in series with the gate.....
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This circuit is converter to use to charge DC12V from the lead-acid batteries to AC 250V for use in a car, Boats or mobile homes. There are the output power There are the sufficient power to the small electronics such as a lamp or electrical soldering iron.....
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an intermediate to advanced project and I do not recommend it as a first project if you are just getting started in synths or electronics. Only the circuit and some explanation are shown here. A lot of project building, troubleshooting and electronics....
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A sequencer used for music is a device that sequences musical events for predictable playback. For early electronic instruments these sequencers often take the form of a collection of switches that are cued in series and which trigger some other device like....
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Square-wave generator with LC circuit can get a better frequency stability, it`s as shown in the chart. This three-terminal oscillator of capacitor can be used to generate a square wave, but an operational amplifier is used as the active component....
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This voltage regulator circuit can deliver up to 3A at 12V output voltage. The circuit can be employed on occasions when a current of more that 3A is demanded for regulator. IC regulators of such high current rating are pretty hard to find. The transformer....
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The TS2418 is a monolithic integrated circuit telephone Tone ringer with bridge Diode when coupled with an appropriate transducer, it replaces the electromechanical bell. This device is designed for use with either a piezo transducer or an inexpensive....
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I originally wanted to purchase a Nebulophone but, my El-Cheapo price range didn`t like the tag. I realized that I could program my own AtMega 328 by using ArduinoISP Then I found out that if the code was Arduino compatible, why not just use the Arduino as a....
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The notes for the fourth and final class are up on the Spooky Arduino class page. At the end of the class, Mark of Machine Project bestowed upon each of the students a merit badge. It was great. Click above for a larger view of the badge. Here`s a quick....
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The circuit diagram shown here is of a 2 x 60 Watt stereo amplifier based on the LM4780 from National Semiconductors. LM4780 is a superb audio amplifier IC capable of delivering 60W Rms power output / channel into 8 ohm speakers. The LM4780 has very low....
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This is another 100watt inverter circuit diagram. Built based on IC CD4047 and Mosfet IRF540, this inverter have ability to supply electronic device -which require 220VAC- up to 100w from 2-3A transformer....
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An LED - light emitting diode is used to illuminate keypads keys and LCD screen displays on all mobile phones handsets. It is being controlled by a voltage or current draws on its terminal leds. On schematic diagram we notice that the LEDs is driven by an....
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Turn signals work, hazard lights work, stop lights work, head lights work. Tail lights don`t work with the headlights. I looked at the bulbs and they appeared fine. I switched the taillight bulb with the turn signal bulb and it work in the turn signal spot.....
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This stroboscope circuit uses 16 high-brightness white LEDs in a torch housing and it provides a signal output to a frequency counter to provide a rev cou....
A circuit diagram for driving a plasma-type display using ICL7135 is shown in the following schematic. This application is one of the wide versatility variety of this integrating Analog to Digital Converter device..
This circuit controls the switching of the street light or porch light and it will be automated. This circuit of automatic lamp controller using 7806 regulator IC can be used to automate street lights, tube lights or any other house electrical lightning....
If you refer to the above schematic, you`ll notice that the VGA-to-Scope converter has been simplified, while op-amp buffers and inverters were simply eliminated. The continuous current supply to charge up the capacitor can be replaced by a 1Meg pot from 5V....
The 555 frequency can be varied via adjusting the voltage at pin 5. However, the range and linearity of frequency adjustment is very limited. This is a way to greatly improve performance using the inverted 555 timer circuit that was previously posted. Q2 is....
The LM3445 (datasheet) is an adaptive constant off-time AC/DC buck (step-down) constant current controller designed to be compatible with triac dimmers..
The zener provides a constant voltage of 20 V to unijunction transistor Q1, except at the end of each half-cycle of the input when the line voltage drops to zero. Initially, the voltage across capacitor C1 is zero and capacitor C2 cannot charge to trigger....
I`m making a small DC tesla coil with a rotating spark gap. The motor controlling the RSG draws about 3. 8 amps of current at full load, and the 555 control circuit and amp draws about 4 amps. Would it be best to run the motor and 555 circuit parallel from....
AC to DC switching power adaptor circuit with maximum output power of 90W. Switching power supply is built using a high voltage power switching regulator IC MC33374 and some other additional components. The MC33374 IC is a monolithic high voltage power....
With FET in one leg of Wheatstone bridge, meter has input impedance of over 1 megohm. With no input voltage, adjust R4 so meter reads zero. With 9-V battery, RI can be adjusted for full-scale meter reading of 8 V. With 12-V battery, meter range is 0-10 V.....
The chart shows the Christmas lights circuit which uses simple, inexpensive CD4069 CMOS hex inverter to control four circuits with 200 light-emitting diodes (each circuit has 50 LEDs), and it is directly supplied by the 220V power source without power....
This is a car alarm simulator which using the LED as a simulation output. This simple circuit can tell you whether your car is running or not by detecting the voltage difference when the car is on and off. This occurs because when your car This is a car....
This is a simplest circuit for 100 watt inverter for generating 220vAC from 12vDC. I say simplest because here in this inverter circuit a minimum number of components are used to design the schematic, which is quite difficult to make a circuit like this with....
1500 Watt RF Amplifier circuit can be used to drive your transmitter antenna, it can also include driving to the source of the RF high power, microwave heating, and more...
The ESR Meter is basically an AC Ohmmeter with special scales and protective circuitry. It provides a continuous reading of series resistance in electrolytic capacitors. It operates at 100 kHz to keep the capacitive reactance factor near zero. Here`s the....
This melody generator can generate various English and Hindi tunes as also instrumental effects. Various modes of melodies can be selected through DIP switches. Other advantages are high volume and volume control. IC UM3481A is a 16-pin multi-instrument....
tuned-radio-frequency receiver. A radio receiver consisting of a number of amplifier stages that....
Is the battery empty, or is there something wrong with the device That`s always a difficult question when your walkman or some other battery-powered device appears to be dead when you switch it on. Before you take it to the shop for servicing, the first....
[The following circuit is adapted from battery monitors and testers published in The Smith-Kettlewell Technical File (SKTF). The first appearance of this system was "The Smith-Kettlewell Battery Tester, Where Silence is Golden", SKTF, Volume 11, No. 1,....
The idea of a color organ is that any sound, including musical sound, can be transformed into light. As stated by wave theory, both music and light have....
Classic 6-Transistor circuit (many variations of this where around in the 1960`s & 70`s), NPN only output devices, fairly high level of Bias, single rail, input and output coupled via a capacitors (electrolytics - no less), clever feedback loop, bootstrapped....
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....
This is a UHF oscillator circuit I designed to make use of the Mini-Circuits POS-400+ voltage controlled oscillator chip. By giving it a voltage from 0 to 12V on pin 8 it gives out a sine wave ranging from 200MHz to 380MHz on pin 2, though my testing with a....
Rectifted and filtered voltage from the 24 Vac transformer is applied to the LM723 voltage regulator and the npn pass transistor set up for constant current supply. The 470 ohm resistor limits trickle current until the momentary pushbutton (S2) is depressed,....
To activate the air muscle, valve labeled #2 is opened. This causes the air muscle to contract. Once activated the #2 valve may be closed without impacting on the state of the air muscle. The air muscle stays in a contracted state. To relax the air muscle,....
This light activated relay circuit presented here uses the 555 timer IC and a light dependent resistor or LDR to form a light sensitive relay in an intruder alarm system or for switching on a lamp at Sun set and off at Sun rise. Potentiometer R1 value must....
An electromagnetic generator without moving parts includes a permanent magnet and a magnetic core including first and second magnetic paths. A first input coil and a first output coil extend around portions of the first magnetic path, while a second input....
The familiar transistor power supply has one big mother of a filter capacitor on the rectifier output followed by an electronic regulator which regulates out all voltage variations including ripple. In vacuum tube days only the very tip top of the line test....
The following circuit shows about PIC16F819 Dymoclock Sensor Circuit Diagram. Features: a cheap temperature sensor, only LEDs, no decoder, built ....
Here is the circuit diagram of a 741 IC based 3 input mic mixer ckt. Altogether four 741 IC`s are used out of which IC1, IC2, and IC3...
It plugs into the USB port and is just the shot for checking motherboard switch and jumper settings. Many readers will remember a commercial product of a....
Make sure to double-check your connections using the circuit diagram and breadboard schematic (download from these links). You can use this while you....
I am interested in creating an interactive LED gameboard of some kind (or even a sort of "Stargate" DHD-type sci-fi prop!), where each square or tile is lit up from below by either a single white LED or an RGB combo. It always occurred to me that I`d love it....
This wireless remote control switch production is relatively simple. All components parameters we are testing is complete. Reader component parameters we provide installation can be completed in the production of the first resistive and capacitive components....
WHY is the voltage at 12V after the emitter If it`s coming out of the op amp at +15V, then that would put a 3volt drop across the transistor. and why isn`t the gain 2, shouldn`t there be 8 volts coming out to the transistor In that case wouldn`t a 4volt drop....
The Hakkit robotics shield is a breakout kit for the Arduino Uno R3. When assembled the shield gives five standard servo headers taking advantage of the PWM pins on the Arduino and breaks out the analog pins to give six inputs for sensors. This shield is the....
This button, with a few hacks, now makes it so we can open up our office with our Nexus Ones, iPhones or even SMS. Located near the reception desk, this button opens an electronic latch on the front door. Pulling the assembly out of the wall revealed the....
The purpose of this document is to answer the question of why things are done in a certain way and why certain components are used instead of others. The circuit below is a representation drawing to be used for explanation, but with some refinement could be....
A wide range frequency meter is an useful tool for an electronics lab. This projects describes a frequency meter based on AT90S231 microcontroller that can measure input frequencies up to 50 MHz. The measured frequency is displayed on 6 digit multiplexed....
PLL oscillator is used to get very stable frequency woth very low distortion of sine wave output. The stability is equal to crystal-based oscillator, and the low distortion level of the sine wave output is equal to LC based oscillator. The method ofPLL....
Car Stereo Amplifier Circuit with TDA2040 is shown here. TDA2040 is a monolithic integrated audio amplifier operating in Class AB mode. The IC has built in short circuit protection circuitry and thermal very close and more about it can be operated from a....
DC motor interfacing with microcontroller with the help of L293D H-bridge and trasistor based H-bridge. DC motor speed control using PWM. Interfacing DC motor with 8051, AVR, PIC microcontroller....
There are some important considerations to using more memory, but it certainly is possible. the mp3 player project uses 32 megabytes! But using more memory requires careful consideration. The most important factor is that the 8051 processor has a 16 bit....
I want to build a 2 phone intercom which can be used upto 1km using speaker of same phone to create ring on other side please help....
Originally Posted by dscottguitars A rotary 3 position 3 pole switch. In one pole, through a cap out the other pole, no bleeding from one cap to the....
This Keypad is suitable for the Modular Burglar Alarm. However, it has other applications. Entering the First Four Digits of your chosen Five-Digit code - will energize the relay. Entering the Full Five-Digit code - will de-energize it....
This circuit uses Invisible Infrared light to detect the movement of people through the door. A short beep will be generated when the infrared beam breaks..
This is a simple 12V rechargeable smart battery charger circuit. You can use this best battery charger circuit as car battery chargers, Inverter battery charger, Emergency light battery charger etc. An automatic indicator alarm circuit also comes along with....
This article describes how to build a simple uC based delay circuit for photographic applications like drop or high speed photography. It can be used to control the trigger lag of cameras and flash units, generate a periodic trigger pulse or even control....
The kit includes the following items (depending on which bootloader chip 16MHz or 8MHz) The kit includes the essential items to create your own Arduino 328 board. Here is a breadboard with all the components mounted and running the demo led flash program You....
Simple voltage probe circuit shown in the schematic diagram below very useful in testing, testing, or troubleshooting discrete or integrated circuits,....
This DIY 12V to 220V voltage converter is build with CMOS 4047 that is the main component of this small voltage converter that transforms a 12V DC into 220V AC. 4047 is used as a astable mutivibrator, at pins 10 and 11 will have a symmetrical rectangular....
The circuit below is a one-shot multivibrator. One shot multivibrator is also known as monostable multivibrator, or timer. The main function of such circuit is....
Microcontrollers are integrated circuits which consists of microprocessor with additional units like memories, input/output units (peripherals), etc. With this way of implementation, microcontrollers provide savings in time and space, and of course money.....
This would be a lot easier with a display kit purchased from PJRC, which comes with the correct firmware installed on the display, a working pushbutton board, and the two cables needed. The PJRC display comes with a 4-pin plug that mates with the MP3 player,....
This ac to dc power supply can output 5A in continous operation and 12A peak current. This kind of dc power supplies uses a PCB so you can use two case typ...
Provides overload and short-circuit protection for load while isolating malfunctioning circuit from other loads on common supply bus. In normal operation, Q1 is saturated. When load attempts to draw more than this saturation value, base current of Q1 cannot....
Advanced power control systems make use of electronic plans like Thyristors pro power switching, part control, grinder and so forth. These diplomacy and realize applications participating in inverter design, ability control in lamps, quickness control of....
Here is a simple tool to check the degree of radiation from an electric or electronic instrument. The LEDs in the circuit will give a running light pattern at the moment the circuit senses electromagnetic radiation from the device. It can detect radiation....
Ensure 5/-5 dual supply for chip TL062 IC3. Gnd is common ps ground, let grounds radiate from ground plane in one side of PCB. R3-R8 is an attenuator that may need to be designed or modified. In output R23 is for protection from shorting of 5V supply, R23....
A useful timing strobe can be constructed using high-brightness LEDs and a few common components. Ignition pulses from the number 1 cylinder high-tension lead are used to trigger the circuit via a home-made inductive pickup. Transistors Q1 & Q2 buffer and....
The circuit timer with musical alarm use famous CMOS oscillator/divider IC (IC1 ). Although this circuit operates in 9V its standby current drain is very low. The time delay of timer circuit can be adjusted by adjusting the preset VR1. The base of npn....
The simplest I to V converter is the humble resistor. However, presenting a nonzero impedance to the source of input current is the disadvantage of the humble...
This FM spy telephone circuit is mounted serial with the phone line. When is signal on the wires this transmitter will radiate airwaves thru the wires which act as antenna. There is no need for batteries because it got his voltage supply from the phone....
Simple instrumentation amplifier circuit diagram using opamp. Equation for gain, design.Working and construction also provided....
Its main feature is a selection of outputs at standard fixed voltages used in electronics. Because the outputs are fixed you do not have to worry if the voltage is correct, you just plug the wire in. It is quick and easy to use. You will probably still need....
This extremely simple FM radio receiver circuit is made possible by the special purpose TDA7000 IC. It integrates nearly all the functions necessary to build an FM receiver needing only a few external capacitors and a tuning circuit. Using a simple active RC....
Sine-wave generator produces Walsh-function approximation of sine function. Frequency of sine wave is set by square-wave input to pin 14 of 7493. Filter com ponents of opamp help smooth staircase wave form generated by summing Walsh-function components as....
Summing amplifier or an adder is used to sum two signal voltages. Voltage adder circuit is a simple circuit that enables you to add several signals together. It has wide variety of applications in electronic circuits. For example, on a precision amplifier,....
The power supply has been simplified- Power transformers and rectifiers have been omitted and some parts have been omitted from the MOSFET voltage regulator circuits: 1N5242 zener diodes between the source and gate and 10k resistors in series with the gate.....
This circuit is converter to use to charge DC12V from the lead-acid batteries to AC 250V for use in a car, Boats or mobile homes. There are the output power There are the sufficient power to the small electronics such as a lamp or electrical soldering iron.....
an intermediate to advanced project and I do not recommend it as a first project if you are just getting started in synths or electronics. Only the circuit and some explanation are shown here. A lot of project building, troubleshooting and electronics....
A sequencer used for music is a device that sequences musical events for predictable playback. For early electronic instruments these sequencers often take the form of a collection of switches that are cued in series and which trigger some other device like....
Square-wave generator with LC circuit can get a better frequency stability, it`s as shown in the chart. This three-terminal oscillator of capacitor can be used to generate a square wave, but an operational amplifier is used as the active component....
This voltage regulator circuit can deliver up to 3A at 12V output voltage. The circuit can be employed on occasions when a current of more that 3A is demanded for regulator. IC regulators of such high current rating are pretty hard to find. The transformer....
The TS2418 is a monolithic integrated circuit telephone Tone ringer with bridge Diode when coupled with an appropriate transducer, it replaces the electromechanical bell. This device is designed for use with either a piezo transducer or an inexpensive....
I originally wanted to purchase a Nebulophone but, my El-Cheapo price range didn`t like the tag. I realized that I could program my own AtMega 328 by using ArduinoISP Then I found out that if the code was Arduino compatible, why not just use the Arduino as a....
The notes for the fourth and final class are up on the Spooky Arduino class page. At the end of the class, Mark of Machine Project bestowed upon each of the students a merit badge. It was great. Click above for a larger view of the badge. Here`s a quick....
The circuit diagram shown here is of a 2 x 60 Watt stereo amplifier based on the LM4780 from National Semiconductors. LM4780 is a superb audio amplifier IC capable of delivering 60W Rms power output / channel into 8 ohm speakers. The LM4780 has very low....
This is another 100watt inverter circuit diagram. Built based on IC CD4047 and Mosfet IRF540, this inverter have ability to supply electronic device -which require 220VAC- up to 100w from 2-3A transformer....
An LED - light emitting diode is used to illuminate keypads keys and LCD screen displays on all mobile phones handsets. It is being controlled by a voltage or current draws on its terminal leds. On schematic diagram we notice that the LEDs is driven by an....
Turn signals work, hazard lights work, stop lights work, head lights work. Tail lights don`t work with the headlights. I looked at the bulbs and they appeared fine. I switched the taillight bulb with the turn signal bulb and it work in the turn signal spot.....
This stroboscope circuit uses 16 high-brightness white LEDs in a torch housing and it provides a signal output to a frequency counter to provide a rev cou....
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