Top Circuits Page 101
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[caption id=attachment_45 align=alignnone width=500 caption=Serial RS232 to USB][/caption] This is simple RS232 Serial to USB Converter that...
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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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This circuit is a circuit diagram of the radio-controlled, usually in the toy car application children. Circuit diagram consists of 2 parts of the circuit sender and receiver circuits. To the circuit sending radio signals generated by the oscillator circuit....
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This radio modem is popular for amateur radio packet application. This radio modem is powered by the data and control lines, so it need no additional power...
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This circuit is a circuit diagram of a remote control using DTMF. Actuality we achieve the use of DTMF (dual tone multi-frequency) signals (used the phone to punch in numbers) as the influence of the code. DTMF tones used for the abundance accentuation of....
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This is a project from the dim and distant past that has proven to be a real winner. I have used it as a basis for an 8 channel proportional R / C (AM) and 145MHz FM chat box. Recipients very simple and is shown below. This consists of a single transistor....
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This is a circuit diagram showing the random nature of LED 7 segment. In the diagram circuit IC1 - LM555, R1, R2 and C2 on the circuit a sensitive multi-Stable...
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Infrared light reflected off a finger is used to activate this switch circuit..
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This 555 timer circuit below toggles a relay when a button is pressed. Pins 2 and 6, the threshold and trigger inputs, are held at 1/2 the supply voltage by the two 10K resistors. When the output is high, the capacitor charges through the 100K resistor, and....
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This alarm circuit was designed to monitor a mains-powered smoke detector located in a shed (which is used to house dog kennels). It provides complete isolation from the mains so that low-voltage (12V) cabling could be run to the alarm circuit which is....
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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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As the only electronics engineer in my family and circle of friends, it is sometimes not possible to evade an appeal for help. This time the request came from a friendly elderly lady in a retirement home. In her room the light switch by the door and the pull....
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The following circuit shows about? Remote Control Toy Car Schematic Circuit Diagram. Features: does not impose on the performance of the original ...
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A very interesting remote controlled alarm circuit using TSOP1736. Routing of an electric cable to attach a calling bell switch near the bed of an old age/...
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This Resonance generators (oscillating sound generator) circuit, designed using CMOS integrated circuit number 4011(CMOS Quad 2-Input NAND Gate). Contains within 4 nand gate. To each oscillator circuit has a 2 circuit. This circuit provides a higher....
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This is Resonant Mode LED Driver circuit. This circuit is used to give a constant DC current through a string of a given number of LEDs. This circuit uses...
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Those of you who imagine that a robot voice generator box would require a whole heap of ICs are mistaken; the ISD2500 ChipCorder family of ICs from Winbond...
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The idea behind this post is to bring together some robot designs and trasform them in a new device with new hardware and standard software (arduino of course) and so easier to use. These robots have three things in common: a mechanical structure, the....
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The control-circuit output current has to be amplified when the gate current required to trigger the device is higher than the control-circuit output current...
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If you need a typical circuit for any applications such Mobile phones, MP3 players, Portable electronics and etc using SSM2602 Low Power Audio Codec, we provide you with this SSM2602 Applications Circuit Schematic..
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This circuit shows about SSR Power Control Unit Circuit Diagram. Features: SSR control box provides the control voltage for the relay. Component: ...
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Safety polarity connection circuit design using common electronic components..
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The schematic diagram below shows a very simple sample-and-hold circuit using the CA3140 as the readout amplifier for the memory capacitor. The CA3080A is used...
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Sawtooth wave oscillator? circuit can be implemented using several methods, here we present one design that employs 555 IC.? Here is the schematic diagram of...
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Sawtooth wave oscillator is used in cathode ray tube deflection circuitry, in a PWM modulator, or in a analog to digital conversion. You can also use it in your...
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This circuit is a circuit diagram of resource replacement 1.3V mercury cells or other small batteries. This has many uses and you can use this circuit in the computer to turn on a front panel multi adapter which has a digital thermometer. This circuit took....
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If you want to to try to make a Dashboard Digital Voltmeter Circuit Diagram including part lists, the PCB building and the placement of the components, you may download the article in full pdf here..
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This Schmitt trigger circuit is ``emitter coupled`` and provides a simple comparator action. The 2N3069 JFET places very little loading on the measured input. Schmitt Trigger, emitter coupled, simple comparator, 2N3565, distinct hysteresis loop,...
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This circuit runs a fast battery test without the need of power supply or expensive moving-coil voltmeters. It features two ranges: when SW1 is set as shown in the circuit diagram, the device can test 3V to 15V batteries. When SW1 is switched to the other....
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This easy to build FM transmitter bug can transmit voice to exceptionally good range. Tune trimmer to hear the signal to your near radio. Transmitter frequency range is 88-108 MHz. Max current consumption is 30mA. You can power the fm transmitter bug with a....
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Many designers today are implementing embedded systems that require low cost non-volatile memory. Microchip has addressed this need with a full line of serial EEPROMs, in a variety of memory configurations, using the industry-standard 2- or 3-wire....
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This is a Servo System Controller circuit. This circuit is used to control a servo motor remotely. This circuit uses the 555 and requires only six extra...
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This study is made possible by the availability of a motor potentiometer from All Electronics at small cost. The item is catalog number MPOT-10K, and costs $4. 00. It is manufactured by Alps, and the motor is marked MD157320, the body 725t 10BX2. The....
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Digital ICs and opto-isolators provide the drive for this TMOS servo amplifier, resulting in fewer analog circuits and less drift. Fast and consistent turn-on and turn-off characteristics also enable accurate analog output results directly from the digital....
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The signal can be converted by piezoelectric films in many ways such as thermal to electrical (temperature sensor), mechanical to electrical (microphone), and...
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A modulated current is provided by the integrated rotational speed sensor KMI 15/x. This current signal must be converted to ground referenced voltage signal,...
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This circuit is 5 channel Equalizer simply cheap (one line chanel). Working principle of this series is a series of frequentiefilter with center frequency of 10...
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If you need a negative supply for op-amp or just need negative bias voltage while operating from a single supply voltage (for battery operation for example),...
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Simple AC to DC converter 9VAC to 35VDC This again idea example ac to dc converter model to be simple. By modify 9VAC to 35VDC from when how many is see...
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A simple alarm circuit with diagram and schematic that generates multi tone sound. This alarm circuit is suitable to use in burglar alarms and sirens and is designed using dual op amps MC1458 and LM 380...
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This circuit a simple analog multiplier, the circuit operation may be understood by considering A2 as a controlled gain amplifier, Analog Multiplier, Multiplier Circuit, log-antilog circuit, analog multiplication, controlled gain amplifier, summing junction,....
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This circuit is a simple detection of air flow, this circuit can be signaled in the event of air flow. The sensor used is a filament incandescent lamps. Air Flow Detector, sensor, LED, LM339, op-amp,...
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This circuit is a simple buzzer circuit and it called novel buzzer. It only uses a relay in series with a small audio transformer and speaker. The relay will...
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Capacitive touch sensors are based on the electrical capacitance of the human body. When, for example, a finger comes close to the sensor, it creates a capacitance to Earth with a value of 30 to 100 pF. This effect can be used for proximity detection and....
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car parking sensor circuit takes advantage of the photodiode as the sensor distance. The distance between adjacent sensors...
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This is simple logic probe circuit. Logic probe is used to determine if a point in a circuit has high or low state when the circuit is in operation.? Here is...
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This could be the circuit diagram of a easy electronic combination lock by using IC LS 7220. This circuit may be applied to activate a relay for controlling (on & off) any device each time a preset combination of 4 digits are pressed. The circuit may be....
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Simple FM Transmitter Circuit This simple FM transmitter circuit was built using a transistor with a transmission distance of about 300m around your home. It`s...
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Here is simple function generator. Built around a single 8038 waveform generator IC, this circuit produces sine, square or triangle waves from 20Hz to 200kHz in...
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This is a circuit diagram fuse monitor circuit indicators. This very simple circuit uses only two components, but only with a single resistor and LED this circuit provides visual indication when the fuse has blown. LED1 is usually dead, a short circuit by....
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Circuit diagram of this simple in design for high voltage DC Impedance. This is a circuit diagram with circuit design that was built by uA741 IC. IC is the op-amp non-inverting DC amplifier. IC that has a negative feedback through the DC meters need to 1mA....
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You can use a humidity sensor to give an alert of boat leakage, or when your books start being flooded by heavy rain attack on your broken roof, or anything you...
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Circuit diagram is a simple but effective circuit intercom circuit is based entirely on transistors. Circuit diagram is based on three stages plus RC amplifier. When the pushbutton S2 is pressed, the amplifier cord around T1 ...
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AN6884 is a logarithmic scale LED bar display driver. AN6884 accept wide range of supply voltage, ranging from 3.5V to 16V. This VU (voltage unit) bar display...
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Circuit diagram is a simple parking sensors, sensing the distance between where the rear bumper of the car and obstacles behind the car. In the circuit diagram there are two parts to the scheme and the scheme for the transmitter receiver. Distance can be....
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preamp circuits use infront an RF oscilator to make an RF transmitter that is very sensitive to sound. A microphone preamp must provide stable gain...
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This simple circuit helps you sniff out RF radiation leaking from your transmitter, improper joints, a broken cable or equipment with poor RF shielding. Th...
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This simple AVR Programmer able to transfer hex programs to most ATMEL AVR microcontrollers. It is more reliable than most other simple AVR programmers available out there and can be built in very short amount of time. This Programmer support the AVR....
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Using LM231/331 chip, we can build a low-cost voltage-to-frequency converter, ideal for analog-to-digital conversion, frequency-to-voltage conversion, long-term...
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Stepper motor controller is needed to run a stepper motor, since a stepper motor cannot work by just connecting it to a power supply. ?To program a stepper...
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This circuit is a circuit diagram of a simple transmitter, but very useful circuit which can be used to transmit telephone conversations. When the telephone receiver on the hook to the line voltage of about 48 volts. R7 preset is adjusted to 24.7 V between....
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This is Simple Tone Oscillator Generator. It is use transistor 2N2222 and 2N2907 be main part. By control tone sound with R2 - 50K and use 8ohm size. Detail...
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Touch the sensor of the alarm with your finger and it starts beeping, goes on for some time and then stops. Touching it again, and it goes again! This litt...
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Testing whether a transistor is shorted or open usually done by ohm meter. You test if the base to emitter? or collector permit a current flow in one...
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Ultrasonic sound wave can be generated using electronic circuit. This simple electronic circuit can generate an ultrasonic wave with frequency range of 12 to ...
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This circuit, a simple mixer circuit. It can mix two signal channels and one channel is output. Using a codec circuit, Convert stereo audio to mono audio time. It can increase the number of channels too. By adding a VR1, R1 and C1 to the amount needed. Then....
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The simple mixer schematic is built on common base principle, where input voltages are transformed in alternative currents wich are summed to form the alte...
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Here is vu meter analog circuit. The circuit is left connected to the line terminals of the amplifier. The VU meter is quite simple. T1 and T2 signal increase..
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This is probably the simplest radio transmitter that you will find anywhere. It has a total of five parts and can be constructed into a very small space. It is great for science fair projects or other science related projects where short range transmission....
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Atmega 128 is like other AVR microcontrollers. They are ISP is in-system programmable. Earlier I wrote an article about AVR ISP programmer where 74HC244 buffer is used. Using buffer is safer for your AVR. But what if you need 128 atmega programmer without....
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Sine wave oscillator can be implemented using Wien-Bridge oscillator like in our previous sine wave oscillator circuit, but now we present another method of...
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This is a Sine Wave Oscillator circuit. This circuit as known as? amplitude-stabilized sine-wave oscillator. It can gives high purity sine-wave output down to ...
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An op amp used as a comparator produces a 10-V p-p square-wave output with 100-mV input, to 15 kHz. Adjust R5 for symmetry of square wave at low input levels..
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The VFC in this circuit puts out an adequate sine-shaped output, but does not have good V-to-F linearity, and its frequency stability is not much better than 0.2%. An LM331 makes an excellent linear stable V-to-F converter, with a pulse output; Sine Wave....
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Here is single alarm circuit. The circuit features automatic exit and entry delays, timed bell cut-off and system reset. It has provision for normally open and...
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This is a hearing aid circuit with 1.5v supply. This circuit is used to detect very faint sounds, then deliver the sounds to an 8 ohm earpiece. This circuit...
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Featuring very low power consumption, 675 nA is the total current? consumption for this amplifier? circuit. The output voltage swing is 300 mVpp with a 20...
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Single chip 2.4 GHz Transceiver NRF24L01 is a single chip Radio transceiver for the world wide 2.4 - 2.5 GHz ISM band..
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I some cases, a differential input is needed for voltage measurement. Using the only one operational amplifier, you can build an adapter to provide a floating...
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This is a 3 Band Equalizer circuit. This circuit is made to control the treble, middle and bass range. This circuit uses a single op-amp. With single op-amp we...
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Using only a single transistor and few passive components, you can build a fairly sensitive peak detector. circuit This peak detector circuit is suitable for...
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Here is police tone circuit of siren. this simple and very easy to make it. vr 1 and vr 2 for change delay sound of siren. simple and easy. if sound output not...
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Using any camera in a dull or dark environment generally requires the use of supplementary light. This is a standard technique, and even where adequate natural lighting exists, to take conventional film pictures with enhanced contrast using a fill-in` flash....
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This is a 1.5 to 9 volts inverter schematic circuit. This is low cost and a simple circuit that need few components.This circuit is used in many application...
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Electric motor has been widely used as motion control, and many? type of motor controllers? have been designed to provide variable speed drives for the motor..
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This small video transmitter is very usefull for video surveillance on short distances ( up to 100m ) equipped with a black and white or infrared camera mo...
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This is circuit of soft light dimmer. This circuit uses the IGBT STGP10N50A and the TS555 timer as main components. Here is the circuit: The timer is...
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This is the most simple and affordable solar battery charger that the hobbyist can make. It has a few drawbacks over other similar controls, but offers nu...
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This device is designed to be a simple, inexpensive comparator`, intended for use in a solar cell power supply setup where a quick too low` or just right` voltage indicator is needed. The circuit consists only of one 5V regulator, two transistors, two LEDs,....
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You can save on your electricity bills by switching to alternative sources of power. The photovoltaic module or solar panel described here is capable of delivering a power of 5 watts. At full sunlight, the solar panel outputs 16. 5V. It can deliver a current....
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Here is solar tracking circuit. This circuit is a power generating method from sunlight. This circuit need only maximum sunlight to generate power. This project...
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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....
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This sound frequency meter circuit is simple to build and can be constructed in a portable format. In can measure frequencies with a minimum level of 10 mV...
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A split-phase data signal consists of a series of binary digits that occur at a periodic rate, as shown in waveform A in the timing chart. The weight of each...
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This circuit generates a square-wave which is useful as a clock signal or AC drive for the excitation of sensors. this article presents a square-wave...
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A constant-current/constant-voltage linear charger for single-cell lithium-ion (li-ion) can be constructed using only a tiny battery charger controller chip EUP8054 and a few passive components. This tiny integrated circuit chip is suitable for various....
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The TPS6420x controller is designed to operate from one to three series-connected cells or from a 3. 3 V or 5 V supply obtained from a USB port. At its output it can produce 3. 3 V at 2 A, suitable for powering a microcontroller-based system. With a suitable....
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The circuit decreases the size voltage or Stepdown Voltage converter circuit be dc regulated circuit model switching converter. The that make voltage output...
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The following circuit shows about Stepper Motor Controller Circuit Diagram. This circuit based on the 7404 IC. Features: simple stepper motor ...
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Stepper motor gives a simple, low cost, and accurate position control. Stepper motor can be driven by circuit mounted close to the motor, and controlled by a...
[caption id=attachment_45 align=alignnone width=500 caption=Serial RS232 to USB][/caption] This is simple RS232 Serial to USB Converter that...
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....
This circuit is a circuit diagram of the radio-controlled, usually in the toy car application children. Circuit diagram consists of 2 parts of the circuit sender and receiver circuits. To the circuit sending radio signals generated by the oscillator circuit....
This radio modem is popular for amateur radio packet application. This radio modem is powered by the data and control lines, so it need no additional power...
This circuit is a circuit diagram of a remote control using DTMF. Actuality we achieve the use of DTMF (dual tone multi-frequency) signals (used the phone to punch in numbers) as the influence of the code. DTMF tones used for the abundance accentuation of....
This is a project from the dim and distant past that has proven to be a real winner. I have used it as a basis for an 8 channel proportional R / C (AM) and 145MHz FM chat box. Recipients very simple and is shown below. This consists of a single transistor....
This is a circuit diagram showing the random nature of LED 7 segment. In the diagram circuit IC1 - LM555, R1, R2 and C2 on the circuit a sensitive multi-Stable...
Infrared light reflected off a finger is used to activate this switch circuit..
This 555 timer circuit below toggles a relay when a button is pressed. Pins 2 and 6, the threshold and trigger inputs, are held at 1/2 the supply voltage by the two 10K resistors. When the output is high, the capacitor charges through the 100K resistor, and....
This alarm circuit was designed to monitor a mains-powered smoke detector located in a shed (which is used to house dog kennels). It provides complete isolation from the mains so that low-voltage (12V) cabling could be run to the alarm circuit which is....
This circuit shows about Remote Control Circuit Diagram Through RF Without Microcontroller . Features: simple remote control circuit, uses radio ...
As the only electronics engineer in my family and circle of friends, it is sometimes not possible to evade an appeal for help. This time the request came from a friendly elderly lady in a retirement home. In her room the light switch by the door and the pull....
The following circuit shows about? Remote Control Toy Car Schematic Circuit Diagram. Features: does not impose on the performance of the original ...
A very interesting remote controlled alarm circuit using TSOP1736. Routing of an electric cable to attach a calling bell switch near the bed of an old age/...
This Resonance generators (oscillating sound generator) circuit, designed using CMOS integrated circuit number 4011(CMOS Quad 2-Input NAND Gate). Contains within 4 nand gate. To each oscillator circuit has a 2 circuit. This circuit provides a higher....
This is Resonant Mode LED Driver circuit. This circuit is used to give a constant DC current through a string of a given number of LEDs. This circuit uses...
Those of you who imagine that a robot voice generator box would require a whole heap of ICs are mistaken; the ISD2500 ChipCorder family of ICs from Winbond...
The idea behind this post is to bring together some robot designs and trasform them in a new device with new hardware and standard software (arduino of course) and so easier to use. These robots have three things in common: a mechanical structure, the....
The control-circuit output current has to be amplified when the gate current required to trigger the device is higher than the control-circuit output current...
If you need a typical circuit for any applications such Mobile phones, MP3 players, Portable electronics and etc using SSM2602 Low Power Audio Codec, we provide you with this SSM2602 Applications Circuit Schematic..
This circuit shows about SSR Power Control Unit Circuit Diagram. Features: SSR control box provides the control voltage for the relay. Component: ...
Safety polarity connection circuit design using common electronic components..
The schematic diagram below shows a very simple sample-and-hold circuit using the CA3140 as the readout amplifier for the memory capacitor. The CA3080A is used...
Sawtooth wave oscillator? circuit can be implemented using several methods, here we present one design that employs 555 IC.? Here is the schematic diagram of...
Sawtooth wave oscillator is used in cathode ray tube deflection circuitry, in a PWM modulator, or in a analog to digital conversion. You can also use it in your...
This circuit is a circuit diagram of resource replacement 1.3V mercury cells or other small batteries. This has many uses and you can use this circuit in the computer to turn on a front panel multi adapter which has a digital thermometer. This circuit took....
If you want to to try to make a Dashboard Digital Voltmeter Circuit Diagram including part lists, the PCB building and the placement of the components, you may download the article in full pdf here..
This Schmitt trigger circuit is ``emitter coupled`` and provides a simple comparator action. The 2N3069 JFET places very little loading on the measured input. Schmitt Trigger, emitter coupled, simple comparator, 2N3565, distinct hysteresis loop,...
This circuit runs a fast battery test without the need of power supply or expensive moving-coil voltmeters. It features two ranges: when SW1 is set as shown in the circuit diagram, the device can test 3V to 15V batteries. When SW1 is switched to the other....
This easy to build FM transmitter bug can transmit voice to exceptionally good range. Tune trimmer to hear the signal to your near radio. Transmitter frequency range is 88-108 MHz. Max current consumption is 30mA. You can power the fm transmitter bug with a.....jpg "Serial EEPROM Interfacing (AT24C08 with AT89C2051)")
Many designers today are implementing embedded systems that require low cost non-volatile memory. Microchip has addressed this need with a full line of serial EEPROMs, in a variety of memory configurations, using the industry-standard 2- or 3-wire....
This is a Servo System Controller circuit. This circuit is used to control a servo motor remotely. This circuit uses the 555 and requires only six extra...
This study is made possible by the availability of a motor potentiometer from All Electronics at small cost. The item is catalog number MPOT-10K, and costs $4. 00. It is manufactured by Alps, and the motor is marked MD157320, the body 725t 10BX2. The....
Digital ICs and opto-isolators provide the drive for this TMOS servo amplifier, resulting in fewer analog circuits and less drift. Fast and consistent turn-on and turn-off characteristics also enable accurate analog output results directly from the digital....
The signal can be converted by piezoelectric films in many ways such as thermal to electrical (temperature sensor), mechanical to electrical (microphone), and...
A modulated current is provided by the integrated rotational speed sensor KMI 15/x. This current signal must be converted to ground referenced voltage signal,...
This circuit is 5 channel Equalizer simply cheap (one line chanel). Working principle of this series is a series of frequentiefilter with center frequency of 10...
If you need a negative supply for op-amp or just need negative bias voltage while operating from a single supply voltage (for battery operation for example),...
Simple AC to DC converter 9VAC to 35VDC This again idea example ac to dc converter model to be simple. By modify 9VAC to 35VDC from when how many is see...
A simple alarm circuit with diagram and schematic that generates multi tone sound. This alarm circuit is suitable to use in burglar alarms and sirens and is designed using dual op amps MC1458 and LM 380...
This circuit a simple analog multiplier, the circuit operation may be understood by considering A2 as a controlled gain amplifier, Analog Multiplier, Multiplier Circuit, log-antilog circuit, analog multiplication, controlled gain amplifier, summing junction,....
This circuit is a simple detection of air flow, this circuit can be signaled in the event of air flow. The sensor used is a filament incandescent lamps. Air Flow Detector, sensor, LED, LM339, op-amp,...
This circuit is a simple buzzer circuit and it called novel buzzer. It only uses a relay in series with a small audio transformer and speaker. The relay will...
Capacitive touch sensors are based on the electrical capacitance of the human body. When, for example, a finger comes close to the sensor, it creates a capacitance to Earth with a value of 30 to 100 pF. This effect can be used for proximity detection and....
car parking sensor circuit takes advantage of the photodiode as the sensor distance. The distance between adjacent sensors...
This is simple logic probe circuit. Logic probe is used to determine if a point in a circuit has high or low state when the circuit is in operation.? Here is...
This could be the circuit diagram of a easy electronic combination lock by using IC LS 7220. This circuit may be applied to activate a relay for controlling (on & off) any device each time a preset combination of 4 digits are pressed. The circuit may be....
Simple FM Transmitter Circuit This simple FM transmitter circuit was built using a transistor with a transmission distance of about 300m around your home. It`s...
Here is simple function generator. Built around a single 8038 waveform generator IC, this circuit produces sine, square or triangle waves from 20Hz to 200kHz in...
This is a circuit diagram fuse monitor circuit indicators. This very simple circuit uses only two components, but only with a single resistor and LED this circuit provides visual indication when the fuse has blown. LED1 is usually dead, a short circuit by....
Circuit diagram of this simple in design for high voltage DC Impedance. This is a circuit diagram with circuit design that was built by uA741 IC. IC is the op-amp non-inverting DC amplifier. IC that has a negative feedback through the DC meters need to 1mA....
You can use a humidity sensor to give an alert of boat leakage, or when your books start being flooded by heavy rain attack on your broken roof, or anything you...
Circuit diagram is a simple but effective circuit intercom circuit is based entirely on transistors. Circuit diagram is based on three stages plus RC amplifier. When the pushbutton S2 is pressed, the amplifier cord around T1 ...
AN6884 is a logarithmic scale LED bar display driver. AN6884 accept wide range of supply voltage, ranging from 3.5V to 16V. This VU (voltage unit) bar display...
Circuit diagram is a simple parking sensors, sensing the distance between where the rear bumper of the car and obstacles behind the car. In the circuit diagram there are two parts to the scheme and the scheme for the transmitter receiver. Distance can be....
preamp circuits use infront an RF oscilator to make an RF transmitter that is very sensitive to sound. A microphone preamp must provide stable gain...
This simple circuit helps you sniff out RF radiation leaking from your transmitter, improper joints, a broken cable or equipment with poor RF shielding. Th...
This simple AVR Programmer able to transfer hex programs to most ATMEL AVR microcontrollers. It is more reliable than most other simple AVR programmers available out there and can be built in very short amount of time. This Programmer support the AVR....
Using LM231/331 chip, we can build a low-cost voltage-to-frequency converter, ideal for analog-to-digital conversion, frequency-to-voltage conversion, long-term...
Stepper motor controller is needed to run a stepper motor, since a stepper motor cannot work by just connecting it to a power supply. ?To program a stepper...
This circuit is a circuit diagram of a simple transmitter, but very useful circuit which can be used to transmit telephone conversations. When the telephone receiver on the hook to the line voltage of about 48 volts. R7 preset is adjusted to 24.7 V between....
This is Simple Tone Oscillator Generator. It is use transistor 2N2222 and 2N2907 be main part. By control tone sound with R2 - 50K and use 8ohm size. Detail...
Touch the sensor of the alarm with your finger and it starts beeping, goes on for some time and then stops. Touching it again, and it goes again! This litt...
Testing whether a transistor is shorted or open usually done by ohm meter. You test if the base to emitter? or collector permit a current flow in one...
Ultrasonic sound wave can be generated using electronic circuit. This simple electronic circuit can generate an ultrasonic wave with frequency range of 12 to ...
This circuit, a simple mixer circuit. It can mix two signal channels and one channel is output. Using a codec circuit, Convert stereo audio to mono audio time. It can increase the number of channels too. By adding a VR1, R1 and C1 to the amount needed. Then....
The simple mixer schematic is built on common base principle, where input voltages are transformed in alternative currents wich are summed to form the alte...
Here is vu meter analog circuit. The circuit is left connected to the line terminals of the amplifier. The VU meter is quite simple. T1 and T2 signal increase..
This is probably the simplest radio transmitter that you will find anywhere. It has a total of five parts and can be constructed into a very small space. It is great for science fair projects or other science related projects where short range transmission....
Atmega 128 is like other AVR microcontrollers. They are ISP is in-system programmable. Earlier I wrote an article about AVR ISP programmer where 74HC244 buffer is used. Using buffer is safer for your AVR. But what if you need 128 atmega programmer without....
Sine wave oscillator can be implemented using Wien-Bridge oscillator like in our previous sine wave oscillator circuit, but now we present another method of...
This is a Sine Wave Oscillator circuit. This circuit as known as? amplitude-stabilized sine-wave oscillator. It can gives high purity sine-wave output down to ...
An op amp used as a comparator produces a 10-V p-p square-wave output with 100-mV input, to 15 kHz. Adjust R5 for symmetry of square wave at low input levels..
The VFC in this circuit puts out an adequate sine-shaped output, but does not have good V-to-F linearity, and its frequency stability is not much better than 0.2%. An LM331 makes an excellent linear stable V-to-F converter, with a pulse output; Sine Wave....
Here is single alarm circuit. The circuit features automatic exit and entry delays, timed bell cut-off and system reset. It has provision for normally open and...
This is a hearing aid circuit with 1.5v supply. This circuit is used to detect very faint sounds, then deliver the sounds to an 8 ohm earpiece. This circuit...
Featuring very low power consumption, 675 nA is the total current? consumption for this amplifier? circuit. The output voltage swing is 300 mVpp with a 20...
Single chip 2.4 GHz Transceiver NRF24L01 is a single chip Radio transceiver for the world wide 2.4 - 2.5 GHz ISM band..
I some cases, a differential input is needed for voltage measurement. Using the only one operational amplifier, you can build an adapter to provide a floating...
This is a 3 Band Equalizer circuit. This circuit is made to control the treble, middle and bass range. This circuit uses a single op-amp. With single op-amp we...
Using only a single transistor and few passive components, you can build a fairly sensitive peak detector. circuit This peak detector circuit is suitable for...
Here is police tone circuit of siren. this simple and very easy to make it. vr 1 and vr 2 for change delay sound of siren. simple and easy. if sound output not...
Using any camera in a dull or dark environment generally requires the use of supplementary light. This is a standard technique, and even where adequate natural lighting exists, to take conventional film pictures with enhanced contrast using a fill-in` flash....
This is a 1.5 to 9 volts inverter schematic circuit. This is low cost and a simple circuit that need few components.This circuit is used in many application...
Electric motor has been widely used as motion control, and many? type of motor controllers? have been designed to provide variable speed drives for the motor..
This small video transmitter is very usefull for video surveillance on short distances ( up to 100m ) equipped with a black and white or infrared camera mo...
This is circuit of soft light dimmer. This circuit uses the IGBT STGP10N50A and the TS555 timer as main components. Here is the circuit: The timer is...
This is the most simple and affordable solar battery charger that the hobbyist can make. It has a few drawbacks over other similar controls, but offers nu...
This device is designed to be a simple, inexpensive comparator`, intended for use in a solar cell power supply setup where a quick too low` or just right` voltage indicator is needed. The circuit consists only of one 5V regulator, two transistors, two LEDs,....
You can save on your electricity bills by switching to alternative sources of power. The photovoltaic module or solar panel described here is capable of delivering a power of 5 watts. At full sunlight, the solar panel outputs 16. 5V. It can deliver a current....
Here is solar tracking circuit. This circuit is a power generating method from sunlight. This circuit need only maximum sunlight to generate power. This project...
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....
This sound frequency meter circuit is simple to build and can be constructed in a portable format. In can measure frequencies with a minimum level of 10 mV...
A split-phase data signal consists of a series of binary digits that occur at a periodic rate, as shown in waveform A in the timing chart. The weight of each...
This circuit generates a square-wave which is useful as a clock signal or AC drive for the excitation of sensors. this article presents a square-wave...
A constant-current/constant-voltage linear charger for single-cell lithium-ion (li-ion) can be constructed using only a tiny battery charger controller chip EUP8054 and a few passive components. This tiny integrated circuit chip is suitable for various....
The TPS6420x controller is designed to operate from one to three series-connected cells or from a 3. 3 V or 5 V supply obtained from a USB port. At its output it can produce 3. 3 V at 2 A, suitable for powering a microcontroller-based system. With a suitable....
The circuit decreases the size voltage or Stepdown Voltage converter circuit be dc regulated circuit model switching converter. The that make voltage output...
The following circuit shows about Stepper Motor Controller Circuit Diagram. This circuit based on the 7404 IC. Features: simple stepper motor ...
Stepper motor gives a simple, low cost, and accurate position control. Stepper motor can be driven by circuit mounted close to the motor, and controlled by a...