Popular Circuits Page 53
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The schematic below illustrates 4 methods of controlling a relay with a digital logic signal. Figure (A) can probably be used in most cases where the relay coil requires 100 mA or less and the input current is 2 milliamps or more. The resistor value (R) is....
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The idea to produce a standard TV PAL signal using a SVGA graphics card was born a few years ago, where cheap graphics cards with TV output were still not available. To achieve a CCIR conform TV signal with 50 Hz vertical interlaced refresh and 15.625 kHz....
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With this circuit mounted in or near every phone in the house, it will allow users to know if the phone is being used and not to pick up the phone. When a phone is taken off hook, the voltage across the tip and ring terminals drops to 10 volts or less. This....
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This is the simplest of any programmable oscil lator circuit, since only one stable timing capacitor is required. The output square wave is about 25 V pk-pk, and bas rise and fall times of about 0.5 p,s. ..
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For mad scientists only ! Portable Jacobs Ladder circuit. A very unique project...
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This is class D audio amplifier circuit that is used to control PWM motor speed. This circuit has two advantages for battery-powered portable devices. First, ...
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One spark gap (in a first version these were just copper wires bent into a ring at the end to suppress corona, the current design is somewhat more sophisticated and uses spherical electrodes), It produces a 300kV output pulse with a discharge energy of 36....
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A straightforward circuit using a LM311 for the level detector and a CMOS analog gate to discharge the capacitor is shown. An important property of this type of counter is the ease with which the count can be changed; it is only necessary to change the....
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Feedback control of the phototransistor in this optical detector helps negate the effects of varying ambient light sources. The output of a modulated visible-light LED is detected, amplified, buffered, and fed through a low-pass filter.
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Author Jim Walker describes a very low cost analog delay line circuit using parts such as the LM311 comparator and 74HC74 D flip-flop...
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VU LED indicator is simpler and smaller than their analog, and very common in audio equipment. This version is based on National Semiconductor IC, and using the logarithmic version. Each LED operates with a 3dB difference from before, and the jumper is....
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An astable multivibrator, often called a free-running multivibrator, is a rectan gular-wave generating cir cuit. Unlike the monostable multivibrator, this circuit does not require any ex ternal trigger to change the state of the output, hence the name....
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T-40-16 and 555 ultrasonic transmitter circuit configuration as shown in a, the circuit consists of an ultrasonic transmitter T-40-16 and 555 circuit, adjust the potentiometer RP can change the..
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I have created a light computer that generates an effect like the scanner of the car KITT in the TV series Knight Rider. You can see a visualization of the effect in the image below: Many circuits on the Internet are built with a CD4017 counter IC. I myself....
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This also Not a Cell phone jammer. Jamming a Cell phone is similar on its principle, but totally a different build, you need a range from 800MHz to 900MHz. You need an OP amp and a few other parts and formulas The Radio Jammer sends out a EM wave at a....
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A simple pulse generator with a variable duty cycle and frequency is often useful in the lab to trigger or test other devices, e. g a servo with a frequency of 50 Hz and pulses between 1 and 2 ms. This is where the project started but for reasons we see....
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An audio amplifier based on the TDA7240 IC from ST Microelectronics. The LM1875 is a monolithic power amplifier offering very low distortion and high quality performance for consumer audio applications. This circuit of audio amplifier based IC TDA7240 can....
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Resonant power supplies are popular because of high efficiency, low noise, and compactness. You can implement a resonant buck or boost converter using a single switch. The regulation of the output in such a converter derives from using a constant on or off....
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Traditional UPS adopts the circuit control of simulation, as to manufacturer and user, no matter accuse of technology or SPWM technology, there is a great deal of limitation in analog control. With the development of information technology, high-speed....
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Using minimum component count; this simple circuit will indicate peak audio response on an analogue meter, similar to a tape recorders meter. The circuit uses an op amp as a non inverting amplifier, but with one addition - a diode in the feedback loop. The....
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This simple 12VDC to 220VAC inverter circuit produces an AC output at line frequency and voltage. The 555 is configured as a low-frequency oscillator, tunable over the frequency range of 50 to 60 Hz by Frequency potentiometer R4. The 555 feeds its output....
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Circuit is a very common three-terminal linear regulator expansion flow circuit, when we actually use, because there is no encounter some well-considered or is lower false failures...
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This circuit is of an 2x 2, 500W RMS stereo amplifier, super-light and without switching-mode power supply. The circuit just shows a channel, and the power supply that it assists to the two channels. The audio circuit should be duplicated, but the power....
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Each part of LCD has individual counter, latch, decoder and driver. Pumping signal feeds back to the motherboard of LCD. When the display section is disconnected, the phase and amplitude of the motherboard and display segment drive signal are the same. It....
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No description available...
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This circuit allows you to superimpose a title and/or the time and sate on an incoming video signal - very useful when editing video tapes. It`s also a good introduction to video signals and processing. The text that follows is from David`s article: With the....
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The intelligent discussion of VHF systems requires a feel for VHF systems, and how VHF energy moves through a system. At VHF, wavelength is very short. Wavelength in feet is F/983. 6, a typical 150 MHz system would have a quarter wavelength of 19. 8 inches.....
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There are many kinds of AVR programmers in market, most of these use the parallel port, a serial port (COM port), or the USB but they are very costly and hobbyist like me can not buy such a costly programmer so i decided to make a cheap AVR programmer. Being....
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There are two ways to program AVR-P40-USB:
with ICSP port and with JTAG port.
To program via ICSP port you need serial port or
parallel port AVR-ICSP programmer dongle
(Olimex part # AVR-PG1B or AVR-PG2B).
The serial port ICSP programmer (AVR-PG1B)....
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Circuit shown (A): R], R2 is 15 ~ 18kn, Cl, C2 is 0.01 ~ 10 "F. Figure (b): oscillation frequency, up to 2 ~ 5MHz, RP is adjusted by potentiometer FIG. (C) access. diodes, transistors can be prevented by two simultaneous saturation stop vibration...
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This very special mains-operated dimmer for domestic or industrial lights is not available in proprietary form: it ena..
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This is the circuit diagram of a two channel audio line driver using the high performance dual opamp IC TSH22 from ST Microelectronics. The 25 MHz bandwidth, low distortion and high output current of the IC makes it possible to drive medium impedance loads....
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This article demonstrates basic circuits for pulsing infrared LEDs and low power visible semiconductor lasers using components which are inexpensive and fairly readily available. Many interesting and useful applications can be found in the references cited....
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This article is of interest only to readers whose bicycle lights are powered by a dynamo. The laws on bicycle lights in the United Kingdom are stricter than in other countries and a dynamo is, therefore, a rarity in this country. From the point of view of....
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This is a low-current temperature sensors with a single-wire output. The number of pins that needed to interface with a microprocessor is minimized by this....
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The sine input is ac coupled by capacitor C; R1 and R2 bias the input midway between Vn and Vp, the input threshold voltages, to provide a square wave at the output. ..
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This firmware is intended to run on an Atmel ATtiny2313 operating from a 4, 8, 10, 16, or 20 MHz clock or an AT90S2313 operating from a 4 MHz clock. As far as I have been able to determine, the ATtiny2313 and AT90S2313 versions are interchangeable, and the....
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As shown in FIG 75 impedance linear amplifier circuit configured by RF2320. J1 and J2 are 75 F connector. ..
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As shown in Fig having two temperature zones and thermocouple cold-junction compensation diode input circuit. This circuit uses the J-type thermocouple as a temperature sensor,..
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With switch SI in the off position, as shown, battery voltage is applied across timing-capacitor CI, which stays charged while the rest of the circuitry has no power supplied to it. ..
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The emitter is always going to be a few hundred milli volts behind the base voltage (in this type of configuration) and as the base voltage is 5V, depending on how much current is taken by the "switched" circuit" on the emitter, it is more likely to be 4. 5V....
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Old TV tubes are used as cold cathode x-ray emitters in a simple apparatus developed by Bob Templeman of Chicago, Illinois. With selected beam power tubes of the type used in the high voltage section of TV receivers, the intensity is adequate to make x-rays....
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A three-phase squirrel cage induction motor by a prime mover (such as diesel engines, etc.) drag and asynchronous motor stator windings connected to the outlet end and a number..
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The PMR VHF transceiver Motorola Radius M110 (in further text referred as M110) was manufactured by Motorola GmbH therefore being an European radio. Since many professional radio service users has replaced this transceiver with newer gear, a considerable....
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Cellular phone detector circuit schematic using common electronic parts..
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This egg timer, which is both simple and functional, shows once again that it is not essential to use a microcontroller for everything these days. The circuit consists of only two ICs from the standard 4000 logic family, a multi-position rotary switch and a....
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This design is based on the 18 Watt Audio Amplifier, and was developed mainly to satisfy the requests of correspondents unable to locate the TLE2141C chip. It uses the widespread NE5532 Dual IC but, obviously, its power output will be comprised in the 9. 5 -....
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This is Easy and Mini Timer Circuit ( Egg Timer) by IC 555. Alarm by Buzzer. This be mini timer circuit that interesting. I calls that Circuit Egg Timer. By...
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How to generate the signal for contolling a standard (RC) servo motor using a PIC microcontroller....
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This simple counter can be used to count pulses, as the basis for a customer counter (like you see at the doors of some stores), or for anything else that may be counted. The circuit accepts any TTL compatible logic signal, and can be expanded easily ..
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The circuit in Figure 1 is similar in principle to that of a previous Design Idea (Reference 1) but offers improved, more reproducible performance. The output current is almost constant over an input-voltage range of 1.2 to 1.5V and is insensitive to....
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A voltage ranging from 6 V to 15 V is supplied if only one LED per module is used. The increase in the number of LEDs also corresponds to the increase of voltage supply and the connection of additional LEDs should be in series. The maximum allowed voltage is....
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This circuit modulates a light beam with voice or music from the output of an amplifier. If the 10 K pot is adjusted to slightly less than the Vbe of the transistor, the circuit forms a peak detector..
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Hand held computers are rapidly moving to 3V logic to save
power. Yet higher voltage buses are still utilized elsewhere in
the system for display driving and other functions. The
LT1330 is functionally equivalent to the LT1237 but operates
from 5V with a....
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Xbox controller, a rapid fire mod. All it has to do is send a ground signal to one spot really fast. I make this schematic and sell it(an of course use it): What I need is a chip that thinks that that schematic is in it. Dont suggest a 555 timer, because....
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I dont claim circuit can test all bad mosfets or all fault mosfet conditions. If mosfet is working it will operate in the astable multivibrator circuit causing the Led to flash...
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A circuit that lets you operate your home appliances like lights and water pump from your office or any other remote place. So if you forgot to switch off the lights or other appliances while going out, it helps you to turn off the appliance with your....
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With the advent of modern ICs, sophisticated circuits today no longer have to be complex and lengthy. The chips themselves carry most of the complex circuitry built-in and single handedly perform the desired function. Take for example the present battery....
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This audio-video circuit provides you with wireless audio and visual transmission to a TV. The TV acts as a receiver, eliminating the need to buy a separate monitor. You can also hook it up to a VCR or CCD Camera, and even set up a remote CCTV security....
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This project uses the similar technique to these products, however it can write a continuous stream of text using a high speed rotor and a strip of LEDs. The word WhirlyGig is derived from the word whirl meaning to spin, and the acronym GIG which stands for....
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With a rotary encoder we have two square wave outputs (A and B) which are 90 degrees out of phase with each other. The number of pulses or steps generated per complete turn varies. The Sparkfun Rotary Encoder has 12 steps but others may have more or less.....
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A block diagram of the Commodore 64 internal power supply (how the +12V, +9V and TOD clock signals are generated from the 9V AC input). Taken from the SAMS C64 Troubleshooting Guide. Commodore 64 schematic diagram, scanned with 360 DPI, 2 colours. This seems....
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The circuit is powered by the receiver's pack, the current drain is low, specially if compared to drain of servos.
U1a VZ2 and Q1 are the CURRENT source of the sensor VZ2 is temperature compensated, use the listed component except for Q1 there you can use....
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As the name implies,emergency light is a source of light available during an emergency.It is an automatic system in which a rechargeable battery operated l....
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This little tester is useful for checking vehicle electrical circuits. Two LEDs indicate whether one of the cl..
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This project is based almost directly on the typical application circuit in the National Semiconductor specification sheet. You can also use the TDA2050 (from SGS-Thompson), which has almost identical performance and (remarkably) the same pinouts! As it....
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This power factor controller accept voltage from 90 to 268 Vac, that`s why we call it power factor controller with universal input, since any standards of mains supply in almost any country would fall within that range. This power factor controller is....
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An Icom PCR-1000 listening to various MF, HF and VHF radio stations. However, there is a slight problem. Very slight, almost too small to even mention, more of an inconvenience than a problem. Still, if I am being inconvenienced, than others are too. This....
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The circuit consists of two stages. The first stage is a "switch" or cut-off device. It detects a voltage above 0.7v from the solar panel and the resistance between its collector-emitter terminals reduces to a very small value.
The 10k resistor allows the....
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The PB1009K is a silicon monolithic IC developed for GPs receivers. This IC integrates a full VCO second IF Filter 4-bit ADC and digital control Interface to reduce cost and mounting space. In addition, its power consumption is low. Moreover, use of a TCXO....
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Neither term describes a regulator, only its placement within a circuit or system. Any voltage regulator could meet the requirements, depending on its placement. A listing of Analog Voltage Regulator IC manufacturers. The types of products or devices they....
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the circuit has two-stage circuit structures, the timing time is about 0. 5~12s, and in figure (b), the range of the timing time is 1~160s. The parameters of transformer: iron chip: M42/15. 7 silicon steel sheet; winding: 0. 18mm, enameled copper wire....
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This simple circuit using a single transistor turns ON the relay when light falls on the LDR.
The potentiometer is adjusted for the required sensitivity.
The power supply is 6V.
Be careful about the impedance of the relay. Its impedance should not be less....
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For those are not into electronics, you must know that an oscilloscope has basically only one timebase to move the spot horizontally from left to right with the same intensity. The vertical deviation is function to the input voltage. You understand....
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Some machines need to run for long periods and therefore may finish their work in the middle of the night or during the weekend. For the time remaining, until the operator returns, the machines stay idle, uselessly consuming power. This Design Idea allows a....
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This is an AC powered LED flasher that can drive two High bright LEDs directly from the power obtained from the AC lines. The high bright LED flasher can b....
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This circuit isn`t easy to built but you will get a great audio quality from this circuit. This circuit will give u a high quality preamplifier, capable to drive high quality power amplifiers with good sound. ..
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This is an Infrared based Broken beam alarm to protect doors and entry passages. It gives a loud alarm when somebody crosses the Invisible Infrared barrier....
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You can use the parallel port of your PC and a few additional components to generate a powerful, easy-to-use arbitrary-waveform generator. By using a Visual Basic program with the circuit in Figure 1, you can generate any waveform (for example, sinusoid,....
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This circuit allows you to record audio from a telephone line into a tape recorder or computer soundcard. Most of the parts for this circuit can be scrounged from an old modem, with some work, it is possible to rewire the modem circuitry and use the old....
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This solid-state push-pull single-ended Class A circuit is capable of providing a sound comparable to those valve amplifiers, delivering more output power (6.9W measured across a 8 Ohm loudspeaker cabinet load), less THD, higher input sensitivity and better....
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Circuit is shown, it is used in the power supply circuit can occur in the case of over-voltage grid on or off phase, promptly cut off the power supply to protect power capacito..
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Capacitive proximity controller usually consists of a radio frequency oscillation circuit and a detection plate. Figure 6-56 is produced with discrete components capacitive pro..
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A shot of direct current will instantly stop any ac power tool motor. Switch Si is a center-off, one side spring return. With Si on, ac will be fed to the motor and the motor will run. To brake the motor, simply press Si down and a quick shot of dc will....
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This circuit will give provide a Good Strobe Effect for a variety of Portable Uses. Nominal current draw is "up to about" 1 amp at 12 volts. Depending on value of capacitor on pin 2 of the 555 and the particular choke that is used...
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Two 741 operational amplifiers are used for the active element in this Wien bridge oscillator. (The 1458 is the dual version of the 741.) Frequencies of the two oscillators were chosen to fit standard component values. Other frequencies between 500 and 2000....
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This is the schematic diagram of LPG gas leakage sensor alarm. The circuit operates off a 9V PP3 battery. Zener diode ZD1 is applied to convert 9V into 5V DC to drive the gas sensor module. The SEN-1327 gas sensor module from RhydoLABZ is applied in this....
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A basic full wave rectified power supply is shown below. The transformer is chosen according to the desired load. For example, if the load requires 12V at 1amp current, then a 12V, 1 amp rated transformer would do. However, when designing power supplies or....
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A few old N64 controllers lying around and figured that it would be pretty cool to use them to control other things. In this article I will describe in detail every step I took to achieve this. I`ve used a PIC microcontroller, but it should not be too hard....