Popular Circuits Page 114
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Figure A shows the circuit of a direct-trigger timing light. The trigger voltage is -taken from the car's ignition circuit by a direct connection to a spark plug. A circuit using an inductive pickup is shown in Fig. B. A trigger transformer is used to....
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This is a design circuit for temperature to digital converter circuit that is based control by LM35 IC. This LM35 is precision integrated-circuit temperature sensors, whose output voltage is linearly proportional to the Celsius (Centigrade) temperatu ....
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The idea was to show time passing, but instead of a traditional clock face or digits or lights representing binary, to use some kind of tactile feedback. A simple vibrate motor was an obvious choice - used as `force feedback` actuators in video-game console....
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Pure sine wave inverters are best, however they are expensive to buy or build. Modified sine wave inverters will power some equipment square wave inve....
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This timer is based on a simple Monostable Circuit. The length of time the relay remains energized - the ON period - is controlled by the values of R3 & C2. And the length of time the relay remains de-energized - the OFF period - is controlled by the values....
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The circuit is capable of supplying either a trickle (50 mA) or high-current (1-A) charge. You can select either charging method or an automatic mode that will first trickle charge a battery if it is particularly low before switching to
high-current charging...
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A meter is any device built to accurately detect and display an electrical quantity in a form readable by a human being. Usually this "readable form" is visual: motion of a pointer on a scale, a series of lights arranged to form a "bargraph, " or some sort....
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Externally, the chassis looks identical to the 22BD. Exception: the 22BD has the jack for the speaker connection - two female sockets - on the right (antenna) side of the chassis; the 3BTD has a 3" harness (Black and Green wires) exiting the left side (same....
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A simple thermostat circuit that can be used to control a relay and supply power to a small space heater through the relay contacts. The relay contacts should be rated above the current requirements for the heater. Temperature changes are detected by a (1.....
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The IR2156 incorporates a high voltage half-bridge
gate driver with a programmable oscillator and state
diagram to form a complete ballast control IC. The
IR2156 features include programmable preheat and
run frequencies, programmable preheat time,....
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A digital AF (audio frequency) counter can be constructed with only few components by using a single 7226B IC from Intensil as shown in the diagram. The upper frequency limit of this circuit is 9 MHz. The four important functions in the frequency counter....
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This section gives step-by-step instructions along with photos to the construction of IR Proximity Switch. Because this is a very simple circuit, only a schematic for the sensor is shown here: (For the PDF format click here. ) This tutorial`s objective was....
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The program uses the internal 4MHz oscillator PIC16F628 2 Input Alarm Circuit....
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Head lamp schematic of Daewoo Korando shown in the following figure. It shows the connection and wiring between each parts and component of head lamp system of the vehicle such as alternator, ignition switch, buy-off switch, high lamp relay, low lamp relay,....
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The Nizo S156 is a really excellent compact camera with a great range of features. This thing is so small you can slip it into a coat pocket, yet it will give truly superb results. Put it on a long boom, car bonnet or stick it on a helmet for the ultimate P.....
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As shown is composed of a transistor relay delay pull circuit. Just power, 16 F capacitor voltage is zero, two transistors are off, the relay does not operate. With 16 F capaci..
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Lots of consumer electronic equipment like TV sets, VCRs, CD and DVD players employs infrared remote control. In some cases, it is desirable to extend the range of the available control and this circuit fits the bill, receiving the IR signal from your remote....
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The diagram below schemes Two Phase Bipolar Stepper Motor Driver using PBL3717A. It shows two PBL3717A IC that control and drive two bipolar stepper motor..
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A USB port, in practice, is capable of supplying more than 100 mA of continuous electric current at 5V to the peripherals which are hooked up with the bus. So a USB port could be utilized, without having any problems, for powering 5V DC operated tiny....
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Circuit as shown, mainly by the integrated voice chip ISD2560 composition. Winbond ISD2560 is produced by a chip with a strong voice recording function, it is a permanent memor..
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After building my Z-match tuner, I wanted to design a circuit board for a Stockton type swr/pwr meter that I could reproduce easily and see how small I could make it. The result is in the above picture. It is a board that measures a scant 1" x 1. 5" and is....
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The ADUC832 MicroConverter is a fully integrated 12-bit data acquisition system-on-a-chip. Like all of ADI`s MicroConverter products, it features precision A/D & D/A conversion and a Flash Microcontroller on a single chip. The ADUC832 is 100% hardware....
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This is a compact three transistor, regenerative receiver with fixed feedback. It is similar in principle to the ZN414 radio IC which is now no longer available. The design is simple and sensitivity and selectivity of the receiver are good. All general....
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Let me begin by saying I built my buffer board with a specific project in mind but I`d like to present it here as more of a general application devic....
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This device is a simple timer, allowing to keep on the headlights of your vehicle for about 1min. and 30sec. , e. g. when accessing some dark place, without the necessity of coming back to switch-off the lights. Pushing on P1 allows C1 charging to full 12V....
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This is a wide input-voltage range high-power LED driver circuit. This circuit based on a buck/boost converter controller regulates current to a white LED....
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AD7710/7715/7730 multifunction digital sensor signal conditioning ICs. They integrate a digital interface with the control port, a clock generator, a digital filter, A/modulati..
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Here I am going to explain you how to make a wireless car. With the advent of IC`s, it has become very simple. Some registers are also required. To make your work simpler I would recommend to go to an Electronics Shop and ask for wireless Car 413 Mhz ASK....
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A very simple to build smoke detector circuit has been discussed here through a schematic diagram, which can be easily built and installed over an area for the necessary detection purposes. The circuit incorporates the versatile FIGARO TGS 813 gas sensor as....
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This microphone preamplifier incorporates automatic gain control, which keeps the output level fairly constant over a wide range of input....
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The fluorescent lamp electronic ballast circuit is composed of the rectifier filter circuit, high-frequency oscillator circuit and output circuit, and it is shown in Figure 3-202. Rectifier filter circuitis composed of the rectifier diodes VDl-VD4 and filter....
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The physical transmission medium for the 429 standard is 78Ω shielded, twisted-pair cable that uses a complementary, differential bipolar RZ (return-to-zero) waveform (Figure 2). The voltages are the net differentials that the biphase drive develops: For....
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Ability to control lights and fans wirelessly has long moved from being an expensive proposition to having commonplace solutions neatly packaged and available for consumers. Even then, coming up with your own custom solution is a lot of fun for hobbyists and....
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The basic idea is that the transmitter sends beeps and you turn the directional antenna until you get maximum signal and that is the direction of the transmitter. It doesn`t work terribly well. The reason being the antenna is quite sensitive, so even though....
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TDA7262 stereo 20 watts audio amplifier circuit design electronic project..
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That circuit allows you to adjust the resistance (with a pot) and adjust the capacitance by opening or closing switches. So, you can have any combination of switches open or closed to get a different effective capacitance. as a side note, if he does crazy....
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The two most common motor-control methods are: DC Chopper control and Phase Angle control. This article explores the differences between the two methods, identifying some of the key trade-offs that can be useful for motor-control designers when determining....
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A dance pad, basically 4 pressure sensors (up, down, left, right). I already made the USB controller as a dance pad and whatnot, now I need to know how to hook up the actual sensors. I want the input to be pulled down to ground, so I figured that I would put....
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The circuit was designed to produce a 500mW output power transmitter whose signal modulated by FM using four transistors. Transmitter an electronic devi....
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Bridge is a low frequency push-pull power amplifier circuit, its structure is very simple, output power up to 1W. Walkman used as an external amplifier, it can serve as phone, ..
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This circuit shows a CA3256 switch/amplifier connected for a direct-coupled output. One of four channels can be selected in parallel with channel 5. The analog switches of channels 1 to 4 are digitally controlled by logic (Fig. 3-35B). A VEE of -5 V is....
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This is the basic interface I used as part of my Computerized Room project. This is the parallel interface only. The 8 bit input card can be found, along with the rest of the project, at Computerize Your Room/House. This interface, as well as the other two....
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The DC-10 MHz amplifier shown below is identical for both scope channels. The input FET should be mounted directly on the adjustable attenuator switch for best frequency response. The vertical position pots, R27 and R51, change the dc level of the traces,....
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MiniVol is my effort at a very simple volume control board based on the excellent TI PGA2320 volume control IC, which offers impressive specs and can operate over a range of -95. 5dB to +31. 5dB. It utilises a small Atmel AVR microcontroller to control the....
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This audio mixer circuit doesn`t use a low impedance input to mix no ideal sources, but use many amplifiers to provide ideal sources before mixed through simple resistors. Ideal source means a sources with low impedances, make the interaction between signals....
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This tutorial is about mp3 mode of WTV020SD-16P module. With this simple circuit, you can play AD4 format music files. At the end of the article, you can see a video output of this simple and easy project. I used a 5V and a 3. 3V regulators for this project.....
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The circuit uses three CA3130 BiMOS op amps in an application sensitive to sub-picoampere input currents. The circuit provides a ground-referenced output voltage proportional to input current flowing through the photodiode. ..
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A very simple and useful antenna amplifier can be constructed using this circuit diagram. This antenna amplifier is very useful for 35kHz-150Mhz frequency band. This antenna amplifier circuit is based on transistors and has a low 3 dB non-linearity and a....
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The function for automatically control the speed of your fan according to the temperature.? Component: BT136 Triac, Capacitor, Resistor, Relay, Fan Motor, ...
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The cheap flashlight had a rather small (0. 22 Farad) capacitor for energy storage - not very much energy, really, approximately 6. 6 Joules maximum or less than 1/1000th of what a single AA alkaline cell contains! Being a standard "super cap" its internal....
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The LOEWE F875 SENSOTRONIC CHASSIS 543/490 is realized with the F800 LOEWE Chassis serie and in the Line / Horizontal deflection output like a COLOR TELEVISION CHASSIS with EHT output with Tripler and Horizontal output with thyristor tech. LOEWE-OPTA....
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This post describes the key changes introduced in the new board revision. Note that although we have not yet exercised our option to add additional signals to the expansion connector, developers of expansion boards should continue to treat pins 4, 9, 14, 17,....
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A 'TV modulator' is really no more than a transmitter. It is a very small transmitter, admittedly, but none the less that is what it is. What does a modulator actually do? In general -and this design is no exception to the rule - it is a simple oscillator....
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The basic design of this project will use a Atmel AT89S8252-24PC Microcontroller, since this micro has 2KB of EEPROM that can be used to store data during runtime. A ADC0838CCN analog to digital will be used to receive up to 8 inputs from sensor devices,....
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By removing harmonics from a square wave, this circuit generates an accurate and adjustable sine-wave output....
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This article describes how to build a general purpose DTMF decoder with a low-price chip from MITEL. The circuit supports DTMF squelch based on 3 digits station ID (full 999 combination). It also supports decoding of 4 additional commands - station ID plus....
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Today I has 12V to 5V 3A DC converter step down Regulator circuit come to deposit. In sometimes friends have power supply 12V 3A, but want Voltage 5V 3A for digital Circuit. This circuit can meet the demand of friends get, by it uses normal electronic part....
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This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor`s output voltage, which is proportional to the measured temperature. The output frequency bursts are conveyed into the....
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The ubiquitous 555 has yet another airing with this bistable using a simple push-button to provide a push-on, push-off action. It uses the same principle of the stored charge in a capacitor taking a Schmitt trigger through its dead-band. Whereas the Schmitt....
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This is a motor speed control circuit that allows safe and easy control of 115VAC "universal motors" like drill motors, blender motors, other power tools, etc. The motor is controlled directly by a triac-diac component that is found in variable-speed....
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This is a simple microphone preamplifer circuit which you can use between your microphone and stereo amplifier. This circuit amplifier microphone suitable for use with normal home stereo amplifier line/CD/aux/tape inputs. This mic preamp can take both....
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FET used as a silencer tube headphone circuit Field-effect transistor is shown as a headphone circuit silencer tube. L from the digital signal processing circuit, R audio signa..
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Bored of playing around with capacitors Then its time for you to move on to super-capacitors. These have huge storage capabilities. In this article you will find out how to build a small LED flashlight using supercapacitors. The main disadvantage of....
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Hello. You seem like people who know their stuff. I`d appreciate you looking at op amp - Humming and Transmission issues - Electrical Engineering and....
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This is the automatically search schematic diagram of FM radio. Its core component is a TDA7088 integrated circuit which includes FM radio receiver, antenna, oscillator, mixer, AFC ( frequency automatic control) circuit, intermediate frequency amplifier ( IF....
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By the photosensitive resistor of this circuit is a circuit diagram of the automatic lighting for hospitals, dormitories corridor and public places. It automatically lights off..
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The µCurrent is in many cases also able to improve upon your meters current range accuracy by using your meters more accurate mVDC or mVAC voltage ranges instead to display the DC or AC current. With AC the frequency response extends flat up to 10KHz, but....
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This flashing light circuit uses triacs to generate an intermittent light with patchy frequency. extra components are the D1 diode and semi modifiable potentiometer R2. The trigger capacitor C1 is increased from 0. 1 µF to 220 µF so to the triacs can be real....
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BA5417 is a stereo amplifier IC with a lot of good features like thermal shut down, standby function, soft clipping, wide operating voltage range etc. The IC can deliver 5W per channel into 4 ohm loud speakers at 12V DC supply voltage. The BA5417 has....
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The LT1007 is capable of providing excitation current directly to bias the 350-0 bridge at 5 V. With only 5 V across the bridge, as opposed to the usuallO V, total power dissipation and bridge warm-up drift is reduced. ..
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If I disconnect the ground of the Arduino from the negative terminal of the power supply, current flows through the MOSFET, even when the switch isn`t closed!..
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This FETVM replaces the function of the VTVM while at the same time ridding the in-strument of the usual line cord. In addition, drift rates are far superior to vacuum tube circuits allowing a 0. 5 volt full scale range which is impractical with most vacuum....
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It can be adjusted to give the desired speed for the display. The output of the 555 is directly connected to the input of a CD 4017. The input of the counter is called the CLOCK line (555). The 10 outputs become active, one at a time, on the rising edge of....
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KIA7042AF is a sub package of KIA7019AF, If you need see the description, please click KIA7019AF. If you need KIA7042AF`s datasheet, please download it from below. By Korea Electronics (KEC) ..
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Lamp Electrical Circuit Diagram Manual PDF Download...
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A stereo power amp designed for use in portable players and radios. A 3V supply can be used to drive headphones providing 20mW in..
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As shown by INA321/322 constitute a low-cost, medium accuracy ECG machine ECG amplifier circuit shown. INA321 input signal from the patients arm around/322, the INA321/322 ampl..
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Simple Electronic Multimeter High cost deters many hobbyists from buying a conventional multimeter. Since it is difficult to obtain cheap 50 uAor 100uA meters which are essential for a highly sensitive multimeter, an electronic alternative device is....
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Build as simple a circuit as possible that will pull a logic line low every time an automotive ignition coil `fires`. My first inclination is to simply attach the `negative` terminal of the coil to the base of of an NPN BJT through a current-limiting....
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Inverters Ula and Ulb are connected in a simple RC oscillator circuit. The frequency is determined by the values of Rl, Cl, C2; and the internal characteristics of the integrated circuit. As long as the circuit is oscillating, a positive dc voltage is....
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The following instructions will allow you to build a practical test tool for troubleshooting and analyzing digital and microcontroller circuits. The complete Assembly and Instruction Manual can be downloaded from the the following web link: Don`s Projects....
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As many or as few channels as are required can be added to the mixer. Do this by just duplicating the input "sections" which are clearly shown on the schematic. One version of this mixer I saw had 25 inputs!..
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The ATV exciter described here uses a pair of Hamtronics model TA451 2-watt narrow-band FM voice transmitters to develop video and audio carriers on 439.250 MHz and 443.750 MHz. The TA451 is a single board, phase modulated exciter designed for amateur radio....
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Ambient light is increasingly being used as a source of energy. To help designers of such systems, this circuit accurately measures ambient light intensity over four decades of measurement. The design is highly cost effective and, with the sensor mounted in....
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All of the above would be internal hardware issuesa. Still, there is a possible fix; though not quick-n-easy and neither is there a workaround. The unit would have to be opened up for visual inspection, voltage measurements, confirm fault and effect repairs.....
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The indicator described here is specifically designed for adjusting the dynamic limiter described elsewhere in this edition and checking whether the maximum level of the reference voltage (P1) needs to be modified. Her e we use a 4 -to -16 decoder IC (type....
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This is a simple type remote control by using RF communication without microcontroller. In this project a remote has been designed for various home appliances like television, fan, lights, etc. It gives lot of comfort to the user since we can operate it by....
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How can we rotate a DC motor in clockwise and anti clockwise directions Or how can we rotate a motor in forward and reverse direction These are the popular question asked by many of the robotic beginners. DC Motor (control) driver circuits are the essential....