New Circuits Page 155
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A schematic diagram of a micropower single-supply instrumentation amplifier circuit is shown below. This circuit only need 15µA of current and can give over....
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Tone Control. Parts: Part Total Qty. Substitutions C1, C3, C5, C7, C15, C16 6 2.2uf Electrolytic Capacitor C2, C6 2 0.05uF Ceramic...
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Here is a circuit of a remote control unit which makes use of the radio frequency signals to control various electrical appliances. This remote control unit has 4 channels which can be easily extended to 12. This circuit differs from similar circuits in view....
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Simple but reliable car battery tester Circuit diagram This circuit uses the popular and easy to find LM3914 IC. This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator) and can be powered from almo....
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The device is based on a GSM/GPRS module with included GPS. Its main function is to detect and communicate its own geographical position using, on the choice, the cellular phone reference system or the GPS. Its small dimensions are due to the use, for the....
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-
-
Mechanical contacts have the disadvantage that they wear out. That is why it is practical to use an electronic touch switch` in some situations. With such a touch switch the resistance of the human skin is used for the switching action. The schematic shows....
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Turn on a "black box" of leds (that operates at 8-9v) when my motion sensor is activated. The problem I`ve got is that the output of my PIR is only 3. 3 volts. Here is my crappy schematic. There are a few things that need to be fixed. First, A resistor is....
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It takes a voltage between 0. 4 and 1. 2 V on pin 5 to control its gain. In the first two versions of the circuit, I used logic ICs and/or counters and an op amp with a resistor network for a DAC to provide the voltage, and all worked well. This last week, I....
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Detailing the design and build of a 60khz time code receiver and clock. From PIC programmer to LED clock display....
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You already appear to have sufficient snubberring around the TRIAC which should eliminate DV/DT based switching (the TRIAC turning itself on due to noise on the gate lead) which I believe that your issue is on the micro side of things. I think your issue is....
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-
Uploaded with ImageShack.us Uploaded with ImageShack.us Uploaded with ImageShack.us Hi folks, just wondering if anyone has tried these circuits. The....
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The 555 can be used as an amplifier. It operates very similar to pulse-width modulation. The component values cause the 555 to oscillate at approx 66kHz and the speaker does not respond to this high frequency. Instead it responds to the average CD value of....
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A simple timer that can be used to turn on/off a load after user specified time. The prototype was developed using xBoard MINI, a low cost easy to use ATmega8 development board. The program was burned to the MCU`s flash memory using eXtreme Burner - AVR....
-
This is an IR remote control for Nikon cameras. It is compatible with the Nikon ML-L3 remote control. Supported cameras include: D40, D40X, D50, D60, D70, D70s, D80, Coolpix 8400 8800. This design is based on an idea from The circuit is extremely simple: an....
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The LO system from the project entitled A Monoband SSB/CW Transceiver in Chapter 6 of EMRFD. The mega low (about -20 dBm) output from a diode ring mixing a VFO and crystal oscillator is triple tuned band-pass filtered and then amplified to +8 dBm. Continuing....
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This fm rf power amplifier circuit is built with BLY94 transistor which delivers up to 50W at 175MHz and has a power gain of 7dB, arround 5x power amplification. But in this schematic bly94 is working in 3 meter band, FM 88-108 MHz, so it has a higher power....
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10W HF linear amplifier circuit schematics free electronic circuits diagram wiring design plans schema DIY projects handbook guide tutorial schematico electrG³nico schG©matique diagrama esquemG tico projeto elektronisch schematisch schaltplan schematy....
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The drawback of this architecture is that it disregards the differences between the various channels. First, the subwoofer channel has a reduced bandwidth and its signal is often generated in real time by summing the low-frequency components of the....
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This circuit shows about Remote Control Circuit Diagram Through RF Without Microcontroller . Features: simple remote control circuit, uses radio ...
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This project describes a digital clock with alarm function. It uses a PIC16F877 microcontroller to generate an accurate 1 sec delay with Timer0 using Roman`s zero error method. The time is displayed in large size font on a 4G—20 character LCD that uses....
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When power is applied, the 15K resistor and 10uF cap at pin 15 will reset the counters to the zero count where pin 3 is at +12 and all other outputs are at zero. The 2 diodes (1n914) and 15 resistor form a AND gate so the clock pulse will be passed to the....
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A white-LED-based emergency light that offers the following advantages. 1-It is highly bright due to the use of white LEDs. 2-The light turns on automatically when mains supply fails, and turns off when mains power resumes. 3-It has its own battery charger.....
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The circuit is intended for carrying out harmless experiments with high-voltage pulses and functions in a similar way as an electrified fence generator. T....
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This circuit requires physical connections be made to the computer`s serial port (COM1 or 2). To the best of my knowledge, it is difficult to cause damage to yourself or your computer by improper connections to this port, but there is no guarantee that....
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Circuit audio peak indicator circuit schematics Circuit Electronics, Schematics for audio peak indicator circuit Circuit Electronics....
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This circuit is a circuit diagram of a microphone preamp and circuits (voice circuit) has priority over any other audio signal. In its simplest form, the voice-over only the microphone unit and the change-over switch eating an amplifier, the output of the....
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This is a simple but effective code lock circuit that has an automatic reset facility. The circuit is made around the dual flip-flop IC CD4013. Two CD 4013 ICs are used here. Push button switches are used for entering the code number. One side of all the....
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Here is a simple circuit using IC LM 350, which can be used for charging 12V lead acid batteries. This circuit is perfect for constant charging 12V lead acid batteries. The circuit is designed as a constant voltage source with a negative temperature....
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This easy electronic buzzer circuit built based on timer works for gaining the frequency. The IC timer NE 555 used as astable multivibrator operating at about 1kHz and produces a sound when switched on. The sound frequency can be adjusted b....
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The circuits and wiring diagrams below have been tested on several hi-fi stereo systems with no damage to the systems. However, I cannot be responsible for some hair-brained engineer who may have used a radical design that might be damaged by an unorthodox....
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Its a simple fly back tester, I believe you can built it, i use this circuit to test all of high freq transformer like SMPS transformer or fly back, this circuit is an astable multivibrator with about 90Khz freq, 12 vdc as vcc. To check SMPS transformer or....
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This PSU has been especially designed for current-hungry ham radio transceivers. It delivers safely around 20Amps at 13. 8V. For lower currents, a separate current limiting output, capable of 15ma up to a total of 20A has been added. Let us see what we have....
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The IEEE 802.3af standard governs how the power-sourcing-equipment and power device interact with each other in a power-over-ethernet system....
-
This project can be used with a standard Hitachi HD44780 (or compatible) controller chip to control it through only 2 wires. There is a variety of shapes and sizes available. Line lengths of 8, 16, 20, 24, 32 and 40 characters are all standard, in one, two....
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This fm transmitter circuit is very simple and it has a acceptable transmission. The signal transited from this fm transmitter circuit can be received at almost 300 meters in open air. The circuit require a 3volts operating voltage and can be tuned anywhere....
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As this controller has been designed primarily for controlling model trains, it is designed to deliver around 12-15 Volts, although this system should work with as low a voltage as 3V (indeed it also works on a 6V supply to control some accessories I have).....
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I`ve been looking around for a mains (220-240VAC) power monitoring circuit that I might be able to interface with an Arduino. There is of course the OpenEnergyMonitor solution, but they seem to use a transformer to isolate and measure the mains voltage. The....
-
The STI5211 is a standard definition, full back-end processor for satellite set-top boxes, compliant with ATSC, SMPTE VC-1, DVB-S2, DIRECTV, DCII and ARIB BS4 specifications. It provides very high performance for low-cost SD systems. With its enhanced....
-
This circuit produces a sound similar to the police siren. It makes use of two 555 timer ICs used as astable multivibrators. The frequency is controlled by the pin 5 of the IC. The first IC (left) is wired to work around 1Hz. The 47uF capacitor is charged....
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The timer circuit shown gives independent control of the output`s on and off intervals, which can range from 0. 055 seconds to 30 minutes, relatively unaffected by power-line transients. IC1 is a CMOS programmable-timer chip that includes 24 ripple-binary....
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Stepper motors are a subject that keeps recurring. This little circuit changes a clock signal (from a square wave generator) into signals with a 90-degree....
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The LCD in question appears to have more pins than the microcontroller, I could not expand the image to get a better look. Unless you are adamant about using this display, I recommend obtaining a hitachi compliant alphanumeric display (onboard driver), this....
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The Shay is equipped with flickering ashpan and firebox lights. These are simulated with LEDs. The red and yellow ones both flicker, the red ones stay on about 2/3 of the time and the yellow ones 1/3 of the time. The effect is pretty good while it is going,....
-
While experimenting with different receivers and amplifiers powered by "free energy", it was found that it is more convenient to connect the audio amplifier to the receiver by using only two wires for audio signals and supply voltage. This would allow to use....
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The following circuit shows about Slave Flash Light Control Circuit Diagram. Features: 68mH Inductor, give auto trigger for secondary flash light, ....
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-
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get it on and off continuously. The circuit is using a well known NE555 timer IC which is a very famous IC due to its uses in the wide variety of electronic circuits. In this circuit this IC is connected as a astable multivibator and the 12 volt relay is....
-
-
This circuit is similar to the one above but uses positive feedback to get a little more amplitude to the speaker. I copied it from a small 5 transistor radio that uses a 25 ohm speaker. In the circuit above, the load resistor for the driver transistor is....
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For several years now, a rear fog lamp has been mandatory for trailers and caravans in order to improve visibility under foggy conditions. When this fog lamp is switched on, the fog lamp of the pulling vehicle must be switched of to avoid irritating....
-
-
The key you`ve connected to "E" is used to energize the relay. And the four keys you`ve connected to A, B, C & D - are used to de-energize it. All the other keys on the keypad are connected to "F". = When "E" is pressed - current from the "Com" terminal....
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A 8051 microcontroller based electronics project. This demo project explains how to make a car parking system automated. Here, there is a multi floor parking system, and a lift will take your car to the appropriate parking area depending on the cars that are....
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This miniature audio amplifier delivers up to 250mW and can be used like a final stage audio amplifier for radio sets. The schematic is very simple: one BC....
-
This circuit substitutes two white Luxeon 1W Star LEDs for the inverter and fluorescent tube in a standard battery-backed illuminated exit sign, as used in commercial premises. While the Luxeons have less light output than a standard small fluorescent tube,....
-
simple quiz display is made from two TTL 7445 and 7420 ic.indicate which switch is pressed first with circuit diagram.various interesting and verified game project...
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-
This handy circuit can be used as a speed controller for a 12V motor rated up to 5A (continuous) or as a dimmer for a 12V halogen or standard incandescent lamp rated up to 50W. It varies the power to the load (motor or lamp) using pulse width modulation....
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At89s51 microcontroller will be the main component controlling the process, and display different digits on display. The seven segment display is found in many electronic devices. It is just 7 LEDs that have been combined into one case to make a convenient....
-
The following circuit shows about 1993 Toyota Hilux Pickup Power Window Control System Electrical Circuit Diagram. Features: helpfull for yourself and mechanic repair. Component: door lock relay, junction block, power window motor, power window switch,....
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-
This is a fun and useful circuit for demonstrating high frequency high voltge. It can produce up to about 30KV, depending on the transformer used. It is cheap and easy to make, thanks to the standard TV flyback transformer used. It can power LASERS (although....
-
Laptop Schematic Circuit Diagram for Laptop Repair, Laptop Bios Password Remove....
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The most simply way to collect all this free available energy is to use solar cells. One good solar cell in combination with one well configured hho generator can produce a lot of gas that can be used for all kind of applications. And the best, never pay one....
-
The circuit consists of little more than a few coils, a step-up power transformer, and a capacitor. Power from an AC wall receptacle is fed to transformer T1 (a small neon-sign transformer) which steps the voltage up to about 3000-volts AC. The stepped-up....
-
A symmetrical, mV peak to peak triangle waveform can be generated by the circuit depicted in the following schematic diagram. This circuit is featured with....
-
MP3302 is a boost converter IC specifically designed for LED drive applications. The MP3302 can drive 27 LEDs (9 strings of 3 white LEDs in series) from a Lithium ion battery. The IC has internal power MOSFETs for driving the LEDs and has an efficiency of....
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Colpitts oscillator. Its frequency depends on the capacitance of the vary cap diode. The center frequency is changed by varying the biasing voltage of the vary cap through the 47K pot. You can use a 75cm telescopic antenna or simply a length of hook-up wire.....
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My original idea for this project was simply to try and interface the WINTEK WD-C2401P lcd panel to the pic (see my previous post). I figured it would be fun to add a couple of ADC readings to display something useful on the lcd. PORTB on the PIC is used as....
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Energia is a rapid prototyping platform for the Texas Instruments MCU Launchpad. Energia is based on Wiring and Arduino and uses the Processing IDE....
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This is the circuit diagram of a light activated switch based on National Semiconductors comparator IC LM 311 and a LDR. The circuit is based on a voltage comparator circuit wired around IC 1. The non inverting in put of IC1 is given with a reference voltage....
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Ohh ok cool, I have forgotten about the -12 supply because my 555 Oscillator doesn?t use a -12 supply, it only uses a +12 and a Ground. You see on my....
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This simple circuit that converts a 5V PWM signal into a variable precision reference voltage with a rang of -2.5V to +2.5V. Many designs, like a digitally controlled power supply, programmable dummy load, etc, require a Digital to Analog Converter to supply....
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The IC tester in this web site is specially designed for the timer IC LM555. this circuit is used for testing timer IC. circuit diagram and technique of various project ...
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This is Illumination Intensity Measurement System Diagram. The data in the microprocessor is always in digital form. This is Illumination Intensity Measurement System Diagram - Part 1. The data in the microprocessor is always in digital form....
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circuit of burglar alarm using IC timer 555/556 is functioned as an alarm to prevent thief entering your house. The alarm would produce loud sound when a thin wire connecting resistor R1 with IC pin no 4 is broken. Thin fiber is used as the wire. The thinner....
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This two transistor AM radio circuit is also called ""mini-radio"". It uses only 2 transistors and few passive components which makes is very easy to be cons....
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An 8 ohm speaker is used both as a microphone and also an output device. The BC109C stage amplifies in common base mode, giving good voltage gain, whilst providing a low impedance input to match the speaker. Self DC bias is used allowing for variations in....
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The real usefulness of the SR latch comes during input switch transitions. Let`s assume the input switch is a break-before-make and the switch starts in the up position. From the prior analysis, the inputs values when the switch is up are low, low, high,....
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This page describes a project a colleague and I completed between September, 2000 and March, 2001 as part of the Engineering Physics degree program at the University of British Columbia. In summary this project involved building a USB device using the PIC....
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This audio mixer circuit doesn`t use a low impedance input to mix no ideal sources, but use many amplifiers to provide ideal sources before mixed through simple resistors. Ideal source means a sources with low impedances, make the interaction between signals....
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This LM12 audio amplifier circuit will provide a high output power on a 8 ohms or 4 ohms load impedance. The maximum output power delivered by this LM12 audio amplifier is around 60 watts on a 4 ohms load and 100 watts on a 4 ohms load on each channel. A....
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The microphone amplifier / modulator is build around LM324 which is a quad op amplifier provides enough quality amplification to voice picked up by the condenser microphone...
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The function for this circuit is an audio amplifier capable of delivering a decent output power with a minimum no: of parts , with considerable ....
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This application uses the timer connected for astable (free-running) operation, with a modulating signal again applied to the control voltage terminal. The pulse position varies with the modulating signal, since the threshold voltage and the time delay is....
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Various techniques can be used to control the speed of a dc motor, such as using the phase-locked-loop principles, digital inputs, or analog inputs. If desired, the speed of the motor may also be monitored with LED or LCD displays. The project digital DC....
A schematic diagram of a micropower single-supply instrumentation amplifier circuit is shown below. This circuit only need 15µA of current and can give over....
Tone Control. Parts: Part Total Qty. Substitutions C1, C3, C5, C7, C15, C16 6 2.2uf Electrolytic Capacitor C2, C6 2 0.05uF Ceramic...
Here is a circuit of a remote control unit which makes use of the radio frequency signals to control various electrical appliances. This remote control unit has 4 channels which can be easily extended to 12. This circuit differs from similar circuits in view....
Simple but reliable car battery tester Circuit diagram This circuit uses the popular and easy to find LM3914 IC. This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator) and can be powered from almo....
The device is based on a GSM/GPRS module with included GPS. Its main function is to detect and communicate its own geographical position using, on the choice, the cellular phone reference system or the GPS. Its small dimensions are due to the use, for the....
Mechanical contacts have the disadvantage that they wear out. That is why it is practical to use an electronic touch switch` in some situations. With such a touch switch the resistance of the human skin is used for the switching action. The schematic shows....
Turn on a "black box" of leds (that operates at 8-9v) when my motion sensor is activated. The problem I`ve got is that the output of my PIR is only 3. 3 volts. Here is my crappy schematic. There are a few things that need to be fixed. First, A resistor is....
It takes a voltage between 0. 4 and 1. 2 V on pin 5 to control its gain. In the first two versions of the circuit, I used logic ICs and/or counters and an op amp with a resistor network for a DAC to provide the voltage, and all worked well. This last week, I....
Detailing the design and build of a 60khz time code receiver and clock. From PIC programmer to LED clock display....
You already appear to have sufficient snubberring around the TRIAC which should eliminate DV/DT based switching (the TRIAC turning itself on due to noise on the gate lead) which I believe that your issue is on the micro side of things. I think your issue is....
Uploaded with ImageShack.us Uploaded with ImageShack.us Uploaded with ImageShack.us Hi folks, just wondering if anyone has tried these circuits. The....
The 555 can be used as an amplifier. It operates very similar to pulse-width modulation. The component values cause the 555 to oscillate at approx 66kHz and the speaker does not respond to this high frequency. Instead it responds to the average CD value of....
A simple timer that can be used to turn on/off a load after user specified time. The prototype was developed using xBoard MINI, a low cost easy to use ATmega8 development board. The program was burned to the MCU`s flash memory using eXtreme Burner - AVR....
This is an IR remote control for Nikon cameras. It is compatible with the Nikon ML-L3 remote control. Supported cameras include: D40, D40X, D50, D60, D70, D70s, D80, Coolpix 8400 8800. This design is based on an idea from The circuit is extremely simple: an....
The LO system from the project entitled A Monoband SSB/CW Transceiver in Chapter 6 of EMRFD. The mega low (about -20 dBm) output from a diode ring mixing a VFO and crystal oscillator is triple tuned band-pass filtered and then amplified to +8 dBm. Continuing....
This fm rf power amplifier circuit is built with BLY94 transistor which delivers up to 50W at 175MHz and has a power gain of 7dB, arround 5x power amplification. But in this schematic bly94 is working in 3 meter band, FM 88-108 MHz, so it has a higher power....
10W HF linear amplifier circuit schematics free electronic circuits diagram wiring design plans schema DIY projects handbook guide tutorial schematico electrG³nico schG©matique diagrama esquemG tico projeto elektronisch schematisch schaltplan schematy....
The drawback of this architecture is that it disregards the differences between the various channels. First, the subwoofer channel has a reduced bandwidth and its signal is often generated in real time by summing the low-frequency components of the....
This circuit shows about Remote Control Circuit Diagram Through RF Without Microcontroller . Features: simple remote control circuit, uses radio ...
This project describes a digital clock with alarm function. It uses a PIC16F877 microcontroller to generate an accurate 1 sec delay with Timer0 using Roman`s zero error method. The time is displayed in large size font on a 4G—20 character LCD that uses....
When power is applied, the 15K resistor and 10uF cap at pin 15 will reset the counters to the zero count where pin 3 is at +12 and all other outputs are at zero. The 2 diodes (1n914) and 15 resistor form a AND gate so the clock pulse will be passed to the....
A white-LED-based emergency light that offers the following advantages. 1-It is highly bright due to the use of white LEDs. 2-The light turns on automatically when mains supply fails, and turns off when mains power resumes. 3-It has its own battery charger.....
The circuit is intended for carrying out harmless experiments with high-voltage pulses and functions in a similar way as an electrified fence generator. T....
This circuit requires physical connections be made to the computer`s serial port (COM1 or 2). To the best of my knowledge, it is difficult to cause damage to yourself or your computer by improper connections to this port, but there is no guarantee that....
Circuit audio peak indicator circuit schematics Circuit Electronics, Schematics for audio peak indicator circuit Circuit Electronics....
This circuit is a circuit diagram of a microphone preamp and circuits (voice circuit) has priority over any other audio signal. In its simplest form, the voice-over only the microphone unit and the change-over switch eating an amplifier, the output of the....
This is a simple but effective code lock circuit that has an automatic reset facility. The circuit is made around the dual flip-flop IC CD4013. Two CD 4013 ICs are used here. Push button switches are used for entering the code number. One side of all the....
Here is a simple circuit using IC LM 350, which can be used for charging 12V lead acid batteries. This circuit is perfect for constant charging 12V lead acid batteries. The circuit is designed as a constant voltage source with a negative temperature....
This easy electronic buzzer circuit built based on timer works for gaining the frequency. The IC timer NE 555 used as astable multivibrator operating at about 1kHz and produces a sound when switched on. The sound frequency can be adjusted b....
The circuits and wiring diagrams below have been tested on several hi-fi stereo systems with no damage to the systems. However, I cannot be responsible for some hair-brained engineer who may have used a radical design that might be damaged by an unorthodox....
Its a simple fly back tester, I believe you can built it, i use this circuit to test all of high freq transformer like SMPS transformer or fly back, this circuit is an astable multivibrator with about 90Khz freq, 12 vdc as vcc. To check SMPS transformer or....
This PSU has been especially designed for current-hungry ham radio transceivers. It delivers safely around 20Amps at 13. 8V. For lower currents, a separate current limiting output, capable of 15ma up to a total of 20A has been added. Let us see what we have....
The IEEE 802.3af standard governs how the power-sourcing-equipment and power device interact with each other in a power-over-ethernet system....
This project can be used with a standard Hitachi HD44780 (or compatible) controller chip to control it through only 2 wires. There is a variety of shapes and sizes available. Line lengths of 8, 16, 20, 24, 32 and 40 characters are all standard, in one, two....
This fm transmitter circuit is very simple and it has a acceptable transmission. The signal transited from this fm transmitter circuit can be received at almost 300 meters in open air. The circuit require a 3volts operating voltage and can be tuned anywhere....
As this controller has been designed primarily for controlling model trains, it is designed to deliver around 12-15 Volts, although this system should work with as low a voltage as 3V (indeed it also works on a 6V supply to control some accessories I have).....
I`ve been looking around for a mains (220-240VAC) power monitoring circuit that I might be able to interface with an Arduino. There is of course the OpenEnergyMonitor solution, but they seem to use a transformer to isolate and measure the mains voltage. The....
The STI5211 is a standard definition, full back-end processor for satellite set-top boxes, compliant with ATSC, SMPTE VC-1, DVB-S2, DIRECTV, DCII and ARIB BS4 specifications. It provides very high performance for low-cost SD systems. With its enhanced....
This circuit produces a sound similar to the police siren. It makes use of two 555 timer ICs used as astable multivibrators. The frequency is controlled by the pin 5 of the IC. The first IC (left) is wired to work around 1Hz. The 47uF capacitor is charged....
The timer circuit shown gives independent control of the output`s on and off intervals, which can range from 0. 055 seconds to 30 minutes, relatively unaffected by power-line transients. IC1 is a CMOS programmable-timer chip that includes 24 ripple-binary....
Stepper motors are a subject that keeps recurring. This little circuit changes a clock signal (from a square wave generator) into signals with a 90-degree....
The LCD in question appears to have more pins than the microcontroller, I could not expand the image to get a better look. Unless you are adamant about using this display, I recommend obtaining a hitachi compliant alphanumeric display (onboard driver), this....
The Shay is equipped with flickering ashpan and firebox lights. These are simulated with LEDs. The red and yellow ones both flicker, the red ones stay on about 2/3 of the time and the yellow ones 1/3 of the time. The effect is pretty good while it is going,....
While experimenting with different receivers and amplifiers powered by "free energy", it was found that it is more convenient to connect the audio amplifier to the receiver by using only two wires for audio signals and supply voltage. This would allow to use....
The following circuit shows about Slave Flash Light Control Circuit Diagram. Features: 68mH Inductor, give auto trigger for secondary flash light, ....
get it on and off continuously. The circuit is using a well known NE555 timer IC which is a very famous IC due to its uses in the wide variety of electronic circuits. In this circuit this IC is connected as a astable multivibator and the 12 volt relay is....
This circuit is similar to the one above but uses positive feedback to get a little more amplitude to the speaker. I copied it from a small 5 transistor radio that uses a 25 ohm speaker. In the circuit above, the load resistor for the driver transistor is....
For several years now, a rear fog lamp has been mandatory for trailers and caravans in order to improve visibility under foggy conditions. When this fog lamp is switched on, the fog lamp of the pulling vehicle must be switched of to avoid irritating....
The key you`ve connected to "E" is used to energize the relay. And the four keys you`ve connected to A, B, C & D - are used to de-energize it. All the other keys on the keypad are connected to "F". = When "E" is pressed - current from the "Com" terminal....
A 8051 microcontroller based electronics project. This demo project explains how to make a car parking system automated. Here, there is a multi floor parking system, and a lift will take your car to the appropriate parking area depending on the cars that are....
This miniature audio amplifier delivers up to 250mW and can be used like a final stage audio amplifier for radio sets. The schematic is very simple: one BC....
This circuit substitutes two white Luxeon 1W Star LEDs for the inverter and fluorescent tube in a standard battery-backed illuminated exit sign, as used in commercial premises. While the Luxeons have less light output than a standard small fluorescent tube,....
simple quiz display is made from two TTL 7445 and 7420 ic.indicate which switch is pressed first with circuit diagram.various interesting and verified game project...
This handy circuit can be used as a speed controller for a 12V motor rated up to 5A (continuous) or as a dimmer for a 12V halogen or standard incandescent lamp rated up to 50W. It varies the power to the load (motor or lamp) using pulse width modulation....
At89s51 microcontroller will be the main component controlling the process, and display different digits on display. The seven segment display is found in many electronic devices. It is just 7 LEDs that have been combined into one case to make a convenient....
The following circuit shows about 1993 Toyota Hilux Pickup Power Window Control System Electrical Circuit Diagram. Features: helpfull for yourself and mechanic repair. Component: door lock relay, junction block, power window motor, power window switch,....
This is a fun and useful circuit for demonstrating high frequency high voltge. It can produce up to about 30KV, depending on the transformer used. It is cheap and easy to make, thanks to the standard TV flyback transformer used. It can power LASERS (although....
Laptop Schematic Circuit Diagram for Laptop Repair, Laptop Bios Password Remove....
The most simply way to collect all this free available energy is to use solar cells. One good solar cell in combination with one well configured hho generator can produce a lot of gas that can be used for all kind of applications. And the best, never pay one....
The circuit consists of little more than a few coils, a step-up power transformer, and a capacitor. Power from an AC wall receptacle is fed to transformer T1 (a small neon-sign transformer) which steps the voltage up to about 3000-volts AC. The stepped-up....
A symmetrical, mV peak to peak triangle waveform can be generated by the circuit depicted in the following schematic diagram. This circuit is featured with....
MP3302 is a boost converter IC specifically designed for LED drive applications. The MP3302 can drive 27 LEDs (9 strings of 3 white LEDs in series) from a Lithium ion battery. The IC has internal power MOSFETs for driving the LEDs and has an efficiency of....
Colpitts oscillator. Its frequency depends on the capacitance of the vary cap diode. The center frequency is changed by varying the biasing voltage of the vary cap through the 47K pot. You can use a 75cm telescopic antenna or simply a length of hook-up wire.....
My original idea for this project was simply to try and interface the WINTEK WD-C2401P lcd panel to the pic (see my previous post). I figured it would be fun to add a couple of ADC readings to display something useful on the lcd. PORTB on the PIC is used as....
Energia is a rapid prototyping platform for the Texas Instruments MCU Launchpad. Energia is based on Wiring and Arduino and uses the Processing IDE....
This is the circuit diagram of a light activated switch based on National Semiconductors comparator IC LM 311 and a LDR. The circuit is based on a voltage comparator circuit wired around IC 1. The non inverting in put of IC1 is given with a reference voltage....
Ohh ok cool, I have forgotten about the -12 supply because my 555 Oscillator doesn?t use a -12 supply, it only uses a +12 and a Ground. You see on my....
This simple circuit that converts a 5V PWM signal into a variable precision reference voltage with a rang of -2.5V to +2.5V. Many designs, like a digitally controlled power supply, programmable dummy load, etc, require a Digital to Analog Converter to supply....
The IC tester in this web site is specially designed for the timer IC LM555. this circuit is used for testing timer IC. circuit diagram and technique of various project ...
This is Illumination Intensity Measurement System Diagram. The data in the microprocessor is always in digital form. This is Illumination Intensity Measurement System Diagram - Part 1. The data in the microprocessor is always in digital form....
circuit of burglar alarm using IC timer 555/556 is functioned as an alarm to prevent thief entering your house. The alarm would produce loud sound when a thin wire connecting resistor R1 with IC pin no 4 is broken. Thin fiber is used as the wire. The thinner....
This two transistor AM radio circuit is also called ""mini-radio"". It uses only 2 transistors and few passive components which makes is very easy to be cons....
An 8 ohm speaker is used both as a microphone and also an output device. The BC109C stage amplifies in common base mode, giving good voltage gain, whilst providing a low impedance input to match the speaker. Self DC bias is used allowing for variations in....
The real usefulness of the SR latch comes during input switch transitions. Let`s assume the input switch is a break-before-make and the switch starts in the up position. From the prior analysis, the inputs values when the switch is up are low, low, high,....
This page describes a project a colleague and I completed between September, 2000 and March, 2001 as part of the Engineering Physics degree program at the University of British Columbia. In summary this project involved building a USB device using the PIC....
This audio mixer circuit doesn`t use a low impedance input to mix no ideal sources, but use many amplifiers to provide ideal sources before mixed through simple resistors. Ideal source means a sources with low impedances, make the interaction between signals....
This LM12 audio amplifier circuit will provide a high output power on a 8 ohms or 4 ohms load impedance. The maximum output power delivered by this LM12 audio amplifier is around 60 watts on a 4 ohms load and 100 watts on a 4 ohms load on each channel. A....
The microphone amplifier / modulator is build around LM324 which is a quad op amplifier provides enough quality amplification to voice picked up by the condenser microphone...
The function for this circuit is an audio amplifier capable of delivering a decent output power with a minimum no: of parts , with considerable ....
This application uses the timer connected for astable (free-running) operation, with a modulating signal again applied to the control voltage terminal. The pulse position varies with the modulating signal, since the threshold voltage and the time delay is....
Various techniques can be used to control the speed of a dc motor, such as using the phase-locked-loop principles, digital inputs, or analog inputs. If desired, the speed of the motor may also be monitored with LED or LCD displays. The project digital DC....
