Popular Circuits Page 241
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As you can see in this FM IF MW radio receiver circuit schematic the LA1260 ic can be used in AM FM radio receiver electronic projects. LA1260 has integrated in the package many functions and features that are needed for radio receiver applications. high S/N....
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The first switching LED driver that we will study is the buck converter. The buck converter is the simplest of the switching drivers, and is a step-down converter for applications where the load voltage is never more than about 85% of the supply voltage. The....
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This is a write-up for a 2011 update to the 2008 lanc circuit project, lets call call phase 2. This update allows the use of a cx700v camera to be used in the same underwater video housing. Such a housing is called a generic housing. A generic housing....
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ICl-c functions as a noninverting comparator, and ICl-a operates as an inverting comparator. Potentiometer Rl and fixed resistors R2 and R3 form a divider chain that delivers slightly different voltages to the two comparators. These voltages define the....
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The circuit below uses two quad voltage comparators (LM339) to illuminate a series of 8 LEDs indicating volume level. Each of the 8 comparators is biased at increasing voltages set by the voltage divider so that the lower right LED comes on first when the....
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Laboratory power supply is characterized by its wide adjustable voltage range and its robustness. Continuous voltage adjustment is necessary, as well as current limiter for safety and robustness. You can build suitable one using LM10 op-amp and voltage....
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The system uses optical fingerprint sensor with ARM Cortex M3 core STMicroelectronics 32-bit high-performance microcontroller STM32F205RE..
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Comprising two low-power, CMOS chips, thepulse generator produces a precise pulse width in the 50 to 500 ns range. ICl is a dual monostable multivibrator (one shot) in which each positive trigger pulse initiates simultaneous positive output pulses at pins....
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The M-88L70 is a full DTMF Receiver that integrates both bandsplit Filter and decoder functions into a single 18-pin DIP or SOIC package. Manufactured using CMOS process technology, the M-88L70 offers low power consumption (18 mW max), precise data handling....
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You can use this powerfull amplifier in any small audio project. It is very small (6.5 x 4.5 cm).It outputs 10W and uses a 9V battery...
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This project describes a new economical solution of home light control systems. The presented home light control system can be used for different sophisticated home applications. The control system consists of a PC, and control circuitry and the electrical....
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As shown for the modification of the differential circuit. Figure, A1 is an integrator, the output is ..
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A circuit schemes basic heavy-duty electrical system which connecting components such battery, starting motor, alternator, magnetic switch, ignition switch, and connected wiring..
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This MK484 AM radio circuit provides a complete solution including : RF amplifier, Detection and AGC circuit (automatic gain control ), which requires only a few external components to give a high quality AM Tuner. The circuit has an input impedance of....
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PTB78560BAS is a sub package of PTB78560B, If you need see the description, please click PTB78560B. If you need PTB78560BAS`s datasheet, please download it from below. By Texas Instruments ..
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The circuit is shown in Figs. 1-2 and tested succesfully. This is a 555 timer IC based charger. The circuit is operated by 8.4VDC. For R1=2.7K, R2=3.3K, and C1=10nF, oscillation frequency is about 25KHz. Measured period is about 40µs when there is no toroid....
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The servo driver is just simply two 4017 decade counters and lots of 0.1" headers. Only populate the A side headers; the B servo bank is optional and will require a few more header pieces. If you received 20 headers, you'll be short two of them. If you....
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The circuit automatically turns on when the car is turned off. It gives you a variable time to get out and lock..
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Power a 12v fan using a darlington so I can control the speed from an Arduino. When I wire up as below nothing happens, even though I`m sending a PWM signal: Please draw a proper circuit. Edit your question and hit Ctrl+M, the current image is unreadable.....
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This UHF amplifier circuit electronic project can be useful in situations where the TV signal is weak. The UHF amplifier circuit has a gain of 10-15 dB in a frequency range between 400 and 850 MHz. To obtain optimum performance and good reliability, the PCB....
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This project Digital gated Emulator using Microcontroller is used to emulate the basic gates such us NOT, OR, AND. The system has the selector switch by which we can select any gate. The system has two inputs and one output. We use two SPDT switches for the....
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This project has 3 features.
1. It`s a Field Strength Meter,
2. A Frequency Meter and,
3. An aid for testing detuned transmitters.
Its uses will become clear in a moment but firstly let`s go over the background of a Field Strength Meter.
A Field....
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Stereo tube amplifier circuit which is built based 5 power tubes of 6SQ7-GT, 6V6-GT and 5Y3-GT. This circuit generates up to 4 watts audio output each channel..
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This would require a 1200 rpm synchronous motor and a light source, which would be made of a row of LEDs, arranged vertically, and located about 6 inches from the screw. My plan was enclose it in a clear plastic cabinet so all the components would be....
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The sensitivity of receiver it is possible to increase itself considerably, if is interfered, between this and his aerial, a amplifier RF. The amplifier of circuit, does not use in resonant circuits and for this is suitable, so much for mid waves, what for....
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A circuit which basically connects the line out (audio output) of a music playing device to a set of LEDs (actually a huge strip of around 200 LEDs), so they flash in time with the music (from internet tutorials - I`m a bit of beginner). My circuit works....
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A zero-crossing detector would convert an input sine wave (Vin) to a square wave, which when high would charge an op-amp integrator. Subsequently, a reference-input square wave would discharge the integrator. The integrator output voltage at the conclusion....
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Running from a 9-V battery, this transmitter can be used as a wireless microphone with an ordinary 88- to 108-MHz FM broadcast receiver. Keep the antenna length under 12 inches to comply with FCC limits. LI is 6 turns of #24 wire wound around a pencil or a....
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By inserting a high-pass filter section in the IF lead, this mixer is terminated at all frequencies, besides the IF, for oth..
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This Bat Detector Circuit is authored by Chris Eve. Basic tests with a variety of salvaged electret microphones all showed good response to 50kHz and beyond, the smaller the unit the better the response. My tests indicate that a small electret microphone has....
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This device has 24 milliwatts quiescent power drain when operating from 6 V supply in which making the LM386 ideal for battery operation. It is stated in the application hints section ofLM386 datasheet, there are two pins (1 and 8 ) provided for gain control....
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This is a design for a low noise microphone preamplifier, which is ideally suited to low impedance (600 Ohm nominal) microphones. One limitation is that it is not balanced, which is not a problem in a home recording environment, but will allow the mic lead....
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This supply can serve as a battery eliminator for various devices (such as tape recorders, small..
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Breaker manually operated mechanism widely used type CS2. AC power operation manual operation control signal circuit shown in Figure 6-68. Figure, wc for the control of small b..
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Can reduce the electric current ripple on the Filtering capacitance greatly while adopting this kind of structure, thus has reduced and filtered the size of inductive magnitude and whole DC-DC converter greatly. This kind of converter operates the....
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You probably know that LM317 IC is used as an adjustable voltage regulator, but did you know it can be used as an audio amplifier? This is a class A audio amplifier built with LM317 that delivers a maximum 1W audio power. Use a good heatsin....
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The TL082 (Or a TL072 also is OK) Creates an Adjustable Sawtooth Generator. (It also has a Square wave Output, but it isn`t used here.)
The Left and Right LED`s are Connected in Series and if this circuit is used on a 12 volt system, and if a person....
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This device uses a PIC12F615 to implement a capacitor discharge ignition system. When the switch (button) is closed, the PIC sends pulses to the IRF644 MosFet creating high voltage pulses to charge the 1.0 uf/250 volt capacitor. The voltage is read back via....
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The Hand Steadiness Tester is a game which tests the steadiness of your hand. The player has to take the ring from one end to another end without touching it to the wire. In this the player gets 4 turns. If the player touches the wire 4 times he has to reset....
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Here is a Simple Circuit to give a Flashing LED, With a "Rising and Falling" Brightness. It Uses the Sawtooth waveform from pins 2 and 6 to create the rise and fall. The Resistor and LED on Pin 3 are Optional. The 10K Potentiometer give a reasonable range of....
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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....
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This circuit will drive a relay coil from a low power output, usually from an IC like 555 or a TTL/CMOS. It is used to switch high loads or loads that needs AC current to operate. The relay will be actuated when the input of the circuit goes high. The....
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This circuit consists of a tri-color LED, a resistor, wire, and a coin-size test plate. You will have to build two such circuits one for each black clamp on a set of auto battery jumper cables. The author installed the circuits inside the black clamps....
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A segment may be tested by applying an alternating voltage of a few volts across it. Note that the application of a direct voltage will damage the display irreversibly: the resulting current will remove the tracks. The alternating voltage should contain not....
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Doing the caller id with the pic 16f628A. My programming and ic are working very well but my mt8870 decoder is not working. i need some help here. i stay in Malaysia please help if anyone got any idea..
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The circuit can be used for switching OFF a particular lamp or group of lamps in response to the varying ambient light levels. The unit once built can be used for switching OFF a lamp when dawn breaks and switching it ON when dusk sets in. The power supply....
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This stage begins at the VHF antenna. The incoming VHF RF signal is preamplified and filtered and presented as the "RF" signal to the ADE + Double Balanced Mixer (DBM). That mixer also accepts the Local Oscillator `s output (BEFORE the Quadrature Clock....
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Can be directly connected to CD players, tuners and tape recorders. Simply add a 10K Log potentiometer (dual gang for stereo) and a switch to cope with the various sources you need. Output power: well in excess of 25Watt RMS @ 8 Ohm (1KHz sinewave)....
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A recent Design Idea described a method for designing simple, high-frequency LC oscillators with few passive components (Reference 1). However, for best results, practical hardware design of a stable oscillator requires more parts and greater complexity.....
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IC bus line explains conduct and transmits the bus line as one kind, it uses and is wired little, simple in construction, it is the extensive high-performance bus line way of a application. The operating system that and Linux cuts out publicly and easily as....
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This antenna selector circuit diagram uses PIN diodes which eliminate disadvantages of mechanical switches (especially at high frequency current) PIN diodes can be used which are ideal for this purpose. Resistance diodes such changes linearly in a wide range....
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This circuit design is a class A amplifier employing both ac and de feedback. Bias is stabilized at 15 mA of the collector current using de feedback from the collector. The ac feedback, from collector to base, and in each of the partially bypassed emitter....
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FET can be used as a linear amplifier, a logic gate circuit may also be made, ..
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Powering the LED with a 3V CR2032 battery and hoping I could extend the battery life by making the LED blink instead of having it on all the time. The 555 timer one, with large value resistors in the voltage divider, is probably the best. It might need an....
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CMOS circuits are known for their low current consumption. This is particularly important for battery-powered circuits. Unfortunately, oscillators often require quite a bit of current. We therefore propose this oscillator circuit that has a very low current....
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The LTC4251/LTC4251-1/LTC4251-2 negative voltage Hot Swap controllers allow a board to be safely inserted and removed from a live backplane. Output current is controlled by three stages of current limiting: a timed circuit breaker, active current limiting....
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For the PIC sonar range finding project a PIC microcontroller is ideal. It has a capture timer that can accurately measure the ultrasonic echo time so the distance from the object can be calculated....
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Hi, I wanted to build an IR-transmitter-receiver system to send signals to a device . Let`s say the device is a simple blue LED (just to make life....
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This web page is a memorial to Mike Caughran, KL7R, who died suddenly in January 2007. Mike was a passionate experimenter who was embraced by the homebrew radio electronics community. He was best known as the co-creator of and sidekick to Bill Meara, M0HBR....
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A "theremin" is an instrument you can play just by changing the proximity of your hands with respect to the instrument`s sensors. Traditional theremins generate the classic spacey, spooky sounds from sci-fi and horror films. Ours is a simple optical version.....
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When the time delay expires, SCRl conducts and removes the gate signal from SCR2, which stops the motor. Both the time delay and motor speed are adjustable by potentiometers R2 and R3. If heavier motor loads are anticipated, use the larger C30B SCR in place....
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A very good circuit of pre-preamplifier, for amplification of signals from heads of Moving Coil. It uses the two departments of tube ECC88, association parallel, for reduction of produced noise. The circuit enters in line with existing circuit PHONO.....
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A simple 12 volt inverter circuit. This 120V AC power source is built with a simple 120V:24V center-tapped control transformer and four additional component. This circuit outputs a clean 200-V pk-pk square wave at 60 Hz and can supply up to 20W. The circuit....
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One crude method for distance measuring is by using an ultrasonic transducer. the principle is that u send a burst of ultrasonic wave in the direction of the object and it is reflected back to the ultrasonic receiver. by measuring the time delay from....
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Some experts` think that SMFs may affect the physical well-being of people. If you believe that these experts are right, the magnetic-field meter described will help you find sources of SMFs and determine their strength. These findings may help you reduce....
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Laptop Schematic Circuit Diagram for Laptop Repair, Laptop Bios Password Remove...
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For phototransistors a value of 470K ohms will work for most room light situations. If the light is dim, selecting a higher value resistor such as 1 Megohm will give better sensitivity. This High Impedance Test Voltmeter circuit can also be used for testing....
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This device is used as a reminder to take medicine every day. This device actually contains a crystal watch and a 4001 quad 2-input NOR gate with two of the gates (IC1a & IC1b) wired as an RS flipflop. The watch is set to tablet time , usually mornings,....
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The TDA7088T can be used in mono portable and pocket radios. This is a bipolar integrated circuit. Here`s one of the application circuit diagram: When a...
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This circuit allows you to set a limit on the maximum output current available from your PSU. It`s very useful when you power-up a project for the first time - or carry out a soak-test. By setting an upper limit on the current available from your PSU - you....
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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 module it delivers excellent pictures on a standard color or b/w tv. Instead of BFY90 you can use any VHF....
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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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A trip unit is electrically connected in parallel with a current limiting polymer element in series with circuit breaker contacts to function as a shunt resistance for the polymer element. It becomes energized by transition of the polymer element to its high....
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CoolCAD Electronics, LLC is a CAD and custom electronics design firm that specializes in satisfying non-mainstream electronic design applications..
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This is the schematic for an FM transmitter with 3 to 3.5 W output power that can be used between 90 and 110 MHz. Although the stability isn`t so bad, a PLL can be used on this circuit....
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An Infrared or IR sensor/detector circuit diagram using 555 IC used mainly as Water level or Liquid level sensor and proximity detector circuit....
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This circuit was developed to allow watch crystals to be used in an existing CMOS oscillator circuit that was to run from a 12V supply. The problem is that these crystals only work up to a supply voltage of about 6V. Any more than that and the crystal will....
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This is a 9vdc powered LM13700 dual transconductance op-amp based filter very suitable for battery powered circuits. The design is based on an article by R. A. Penfold for maplin magazine but i have adapted the schematic to have manual filter cut-off and....
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This receiver is capable of better than 1.5 p, VIHF sensitivity and uses MOSFET front-end circuitry with varactors to eliminate conventional bulky tuning capacitors. It also features high dynamic range, ceramic i-f filters requiring no alignment, and a....
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Room temperature plays a vital role in determining human thermal comfort. This digital thermometer is designed to measure room temperature and display it on a LCD screen in both Celsius and Fahrenheit scales. A PIC16F688 microchip is used as the main....
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The LTC1155, dual micropower MOSFET driver, generates
12V from a 5V rail to fully enhance logic-level Nchannel
switches with no external components required
(see Figure 1). Further, the supply current is typically 85mA
with the switch fully enhanced and....
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Here are two simple 12V DC motor speed controllers that can be built for just a few dollars. They exploit the fact that the rotational speed of a DC motor....
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The main characteristic of the transceiver presented below is the simplicity, but in the same time giving good performance, with a minimum investment. The radio is based on MC3362 ( buy ). This integrated circuit its an FM receiver, double conversion, which....
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Quiz-type game shows are increasingly becoming popular on television these days. In such games, fastest finger first indicators (FFFIs) are used to test the player`s reaction time. The player`s designated number is displayed with an audio alarm when the....
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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....