Popular Circuits Page 74
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As shown in FIG MC14541 constituted by a simple timing circuit. The circuit uses IC MC14541 constitute a simple timing circuit. Press the parameter map, the timing for 3 hours,..
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And normally tuning is not easy: you`ll fire the system up and try to notice the spark length, shut it off (and pull the plug!), re-tune (move the tap on the primary), fire it up again and try to remember the spark length of the run before, and do it all....
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The circuit is based on an LM3914N bar graph display driver device (IC1), which can be used to drive up to ten LEDs. This is connected so that with OV12 at the input only the first LED indicator switches on. This simple peak reading VU meter circuit uses six....
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JYC-22F type cooker low voltage power supply circuit is shown. AC 220 V power supply voltage is applied to low-voltage transformer ..
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The modern mechanic switches are improved concerning of old technology. We need however many times to replacement some old switch or to check currents bigger than the durability of certain switches or simple we need something with modern appearance. For he....
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Laser based projects used to be expensive, until the development of solid state lasers. This project is designed for the entry level laser experimenter. The circuit allows any two computers with serial (RS-232) communication capability to communicate over....
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This circuit controls resistive and inductive loads up to 2,500W. Its main functional device is an integrated phase control circuit - Siemens TLE3103. It contains its own power supply, a zero voltage crossing detector circuit and a logic driver. An....
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This simple telephone switching system is designed by Dr. Mustafa Kemal PEKER for training purposes. All responsibility is belong to user. Schematic and c....
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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 from the....
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The circuit provides illumination when darkness comes. By using the gain available in darlington transistors, this circuit is simplified to use just a photodarlington sensor, a darlington amplifier, and three resistors. ..
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The SX 28 internal oscillator Is not that fast so an external oscillator can be hooked up to the processor as shown in the diagram to increase the operation cycles per second...
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555 Timer TV Remote Controlled Home Appliance Circuit Diagram. Features: 555 timer IC to avoid fast switching. you can only switch the circuit ....
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The given circuit, when connected in parallel to a telephone, dis- plays the number dialled from the telephone set using the DTMF mode. This circuit can also show the number dialled from the phone of the called party. This is particularly helpful for....
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The solid-state, unity-gain power buffer is easy to imagine, as many already exist. But what about corresponding tube equivalents Have they been made Could one be made Actually, super cathode followers (complex-and-augmented cathode followers with a gain of....
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The Car shows the distance a train travels on a 5 digit LCD display. The distance is indicated down to 1/100th of a mile (about the length of a 50 foot car) with an accuracy of approximately plus 2 percent using a standard 33 inch freight car wheel.....
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This is a low cost circuit that adds precise current limit functionality to a voltage regulator...
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A step motor controller based on the schematics found on the Arduino Web site. First I try the 2 pins one for bipolar stepper motor. I wont be able to make it work, even less with the library available on the site. Maybe I`m dumb and I really dont understand....
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MOSFET Power Amplifier Circuit diagrams Two complementary MOSFETs are used to deliver 20W into 8?. PARTS....
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This simple temperature relay circuit can be used to signal a fire or setpoint for temperature monitoring function. You need to adjust P1 so that T1`s base....
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This unusual, simple multi-vibrator has only five components and uses neither vacuum tubes nor semiconductors but two miniature NE2 type neon lamps. This circuit interfaces best with vacuum tube or FET type high-impedance circuits. Almost any type of neon....
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The picture below is of my prototype combination card reader and cloner. The unit is self contained and does not require the use of a PC or other external equipment to operate. Operation is simple and straightforward. Simply hold a card near the antenna and....
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This is a handy, easy to build general purpose 50 watt amp. The amp has an input for a radio, TV, stereo or other line level device...
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Here is a circuit that uses a mosfet amplifier as the main booster, or the basis of this booster Amplifier. Circuit which uses MOSFET Power Amplifier is powered by the output more than 200W Speaker 8 Ohm impedance. We also include a suitable power supply....
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This is a simple - easy to build - transistor based motorcycle alarm. It`s designed to work at 12-volts. But - if you change the relay for one with a 6-volt coil - it`ll protect your "Classic Bike". The standby current is virtually zero - so it won`t drain....
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i had a problem while designing a circuit in which BT 136TRIAC has to be triggered from a half rectified current of 30 mA at about 6V. Its not getting triggered. Even for this supply my trigger circuit is consuming power as the 4. 7k 10W resistor is getting....
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This is a really good project for anyone wanting a good old fashioned tremelo pedal using the original optical coupling technology employed in such things as the Reslytone RT-18. I reckon it`s pretty unique with what`s around. There are any number of tremelo....
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This small FM transmitter with a range of about 50 meters designed for connection to the USB port. With lots of mini-transmitters then you have a comprehensive, action-packed radio program. Due to the power supply via the USB port of a high frequency....
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In this circuit, an NE592 acts as an IF amplifier. DC coupling between mixer and amplifier is practical beacuse different + 6 V and + 12 V supply voltages are used. The voltage at the differential input is about 4.5 V. A narrow bandpass filter for the....
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The LA7051 is a video, Audio signal processor IC for UHF band RF Modulator It performs the functions of Audio FM Modulator video clamp circuit, white clip circuit....
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This circuit provides a short circuit protected power supply from PC 12V supply voltage. This is particularly handy when working with PC interfacing projects. Fig-1 shows the circuit diagram of the complete power supply. The necessary 12V supply voltage is....
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The circuit shown is a simple digital frequency meter, which indicates the frequency in hertz of an astable 555 timer. It could, perhaps, be adapted for other uses. An NPN transistor, TR2, is connected to the 555 astable to be measured, as shown in the....
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This circuit generates a low power test signal and should not be used as a transmitter. Make sure you are within the law in the locality in which you operate this. As this was built from parts laying on the bench, it isn't optimized, but it does demonstrate....
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As environmental awareness increases, the electric car has been poured into our family, become an indispensable part of peoples transport. How to prevent the electric car theft..
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This easy as well as cheap but effective device is mainly intended for your ease to leave your fish autofed. You need no longer worry your fish would starve as this autofeeder would replace your job. This autofeeder device will expell pellets byquantityas....
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The TDA7294 amplifier module is a monolithic integrated circuit. It is intended for use as an audio class AB amplifier in hi-fi applications. It has a wide voltage range and output current capability, enabling it to supply the highest power into both 4 ohm....
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In this laboratory experiment, we need to design the frequency determining network for a 1k Hz sinusoidal oscillator. Therefore, we should set:
Capacitance = 100nF
Resistance = 1520 ohm ..
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Each time the switch closes, the voltage on Cl causes inverter A to change state, with positive feedback from inverter B. Resistor Rl delays the charging and discharging of Cl, making the circuit virtually immune to contact bounce. The circuit works....
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I am interested in creating an interactive LED gameboard of some kind (or even a sort of "Stargate" DHD-type sci-fi prop!), where each square or tile is lit up from below by either a single white LED or an RGB combo. It always occurred to me that I`d love it....
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For checking resonances, tuned circuits, antennas, etc., this circuit covers the 2-to 20-MHz range. Ql serves a..
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This blog shows project documentations of various projects done by members of association of experimental electronics. Some projects are very easy and suitable for beginners, some are only for more advanced solderers. The core parts of this sequencer were....
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The circuits and wiring diagrams below have been tested on several hi-fi stereo systems with no damage to the systems. However, I cannot be responsible for some hair-brained engineer who may have used a radical design that might be damaged by an unorthodox....
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These two headlight reminder circuits are easy to install and operate on the KISS (Keep It Simple Stupid) principle. The simple circuit involves adding just a 12V piezo buzzer between the lights circuit and a door switch. The buzzer sounds if the lights are....
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The 100k potentiometers set the voltage level reaching the Op Amps. A dual ganged 100K-Ohm audio-taper potentiometer should be used over a linear taper or potentiometer. In some cases the component may be called a ganged stereo taper. The schematic does not....
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When doing DC analysis, all AC voltage sources are taken out of the circuit because they`re AC sources. DC analysis is concerned only with DC sources. We also take out all capacitors because in DC, capacitors function as open circuits. For this reason,....
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Industrial control systems continue to employ standard analog signals for transmitting data between the process and the control equipment. Robust, 4-to-20mA current-loop signals that are easily transmitted over several thousand feet, ±5 and ±10V signals are....
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This circuit is describes about sensing air flow using microcontroller PIC16C781. In this circuit is using Programmable Switch Mode Controllers (PSMC) that combination between the Integrated Operational Amplifier, Digital-to-Analog Converter (DAC), and gated....
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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 proportional to the measured temperature. The output frequency bursts are conveyed into the mains supply....
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With many audio systems consisting of separate units, you`ll oftennd that due to economic reasons only the amplifier has a remote control receiver module. The control signals are then sent to the other units using patch cables. The tuner and CD player, for....
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The AMU2481 Audio Mixer is a digital realtime signal processor in NMOS technology, housed in a 24pin Dil plastic package or in a 44pin PLCC package. It is de- signed to perform digital processing of both TV Audio in- formation and digital Audio data supplied....
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Fm/am Radio - Sony Corporation, CXA1619BM CXA1619BS is a one-chip FM/AM Radio IC designed for radio-cassette tape recorders and Headphone tape recorders, and has the following functions. By Sony Electronics ..
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The lower schematic is a pretty standard bidirectional rectifier together with capacitors and a 7805 as a fixed 5V source which supplies all the electronic in the frequency counter. For "security reasons" a fuse is used. The upper diagram shows the main....
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I made this project as a test to improve a technic to read analog values without analog-to-digital converter. (ADC) I ended with this "sound meter". It may not work perfectly, it needs some improvement but works anyway. It have the feature of....
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Three 2nd order filters are shown, low pass, high pass, and bandpass. Each of these filters will attenuate frequencies outside their passband at a rate of 12dB per octave or 1/4 the voltage amplitude for each octave of frequency increase or decrease outside....
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CPI is 100w DC super power amplifier circuit composed by the AP500. FIG VTs, Vr7 and VT6, VTs parallel push-pull amplifier output stage the composition, to increase the output ..
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This heatsink temperature monitor circuit signals via 3 LEDs when the temperature exceeds 2 boundary levels. When the heatsink temperature is below 50....
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Circuit uses two features: one is the integrated electronic tuner with AV output (commonly known as the tuner) which can be received CATV full channel TV signal into a final vi..
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This simple and economical IR model train detector circuit is intended especially for those hobbyists who wish to add a smart sensor to detect trains on their model railway track. As can be seen in the schematic diagram, it comprises of a simple infrared....
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I've always wanted to build an electronic led dice, but something different from what we see on the internet. Making it motion controlled... now that's new! Many new cell phones that have accelerometers built in also have dice games. These dice move when....
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A 12V supply is connected to the 12V positive wire, the current flows through a protection diode and a capacitor, in order to filter the voltage into a smoother flow. The zener resistor (R5) limits the current flowing to the zener diode, which regulates the....
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Protect your home appliances from voltage spikes with this simple time delay circuit. Whenever power to the appliances is switched on or resumes after mains failure, the oscillator starts oscillating and D5 blinks. This continues for three minutes. After....
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The circuit uses the very popular Sharp IR module (Vishay module can also be used). The pin nos. shown in the circuit are for the Sharp & VIshay modules. For other modules please refer to their respective datasheets. The receiver consists of a 555 timer IC....
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According electronic schematic of DC driver motor using L293D in figure 2, we can use it to control two DC motor continuously. We can control DC motor one to rotate clock wise and DC motor two to rotate anti clock wise. We also can control all motor to....
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Below is a rough schematic of the layout of the accelerometer PC board looking from the component side. The microcontroller is an Atmel AT89S8252, an 8051 clone. This microcontroller is in-circuit programmable using an SPI interface. The SPI pins are also....
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DC motor reverse brake circuit is shown. Braking, press the stop button SB2, disconnect move off contact so KM1 loss of power release, then turned on the brake contactor KM2 ci..
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Thermostat LM56 Project Circuit Diagram LM56 Thermostat Project Circuit Diagram values of R1, R2 and R3 for the required trip points VT1 and VT2 can be determined using the subsequent equations. VT1 = 1.250V x (R1)/ (R1 + R2 + R3) VT2 = 1.2....
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A bubble vial with external aluminum-foil electrodes is the sensing element for a simple indicating tiltmeter. To measure bubble displacement, a bridge circuit detects the difference in capacitance between the two sensing electrodes and the reference....
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Electrical properties of the tube with good quality output transformer has a great relationship, it is well known thing. Overseas equipment commodities have simply cancel the s..
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Voltage regulator is connected across solar-cell away as shown to prevent damage to storage battery by overcharging. Series diode prevents array from discharging battery during hours of darkness. Regulator does not draw power from battery, except for very....
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In recent years, following CD`s introduction, vinyl recordings are almost disappeared. Nevertheless, a phono preamplifier is still useful for listening old vinyl discs from a well preserved collection. This simple but efficient circuit devised for cheap....
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Telephone Ringer using 556 dual timers. Using modulated rectangular waves of different time periods, The circuit presented here produces ringing tones similar to those produced by a telephone. The...
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A simple timer that can be used to turn on/off a load after user specified time. The prototype was developed using xBoard MINI, a low cost easy to use ATmega8 development board. The program was burned to the MCU`s flash memory using eXtreme Burner - AVR....
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Many modern motherboards are equipped with an infrared data interface compliant with the IrDA standard, but this interface not very often used. However, it is not difficult to build a data transmission module and connect it to the corresponding header. As....
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The 4046 PPL is used as the heart of a tunable ultrasonic receiver that can be used to locate unheard ultrasonic sounds. The receiver might also be used, along with a simple ultrasonic generator, to send and receive Morse code. The incoming ultrasonic signal....
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Fade fades the lighting circuit switch shown in Figure 1-12. The figure for the light switch S, H is accused of lighting. Transistor VT1, VT2 and RC components fade dimming con..
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The schematic diagram come from circuit: Car Lamp Charger power supply. Go to that page to read the explanation about above power supply related circuit diagram. Scheme of the Car lamp charger is shown in above. A distinctive feature of the scheme is that....
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As an alternative to bipolar transistor, a lamp flasher can be built by using two power FETs. Like other flasher circuit, this circuit alternately switch the....
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Powered from two alkaline cells, the circuit in Figure 2 can
illuminate a 1W LXHL-BW02 LumiledsTM white LED with a
constant 320mA current at 85% efficiency. The forward
voltage of the 1W LED, 3.6V typical, requires a boosted
voltage from the 2-cell....
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This voltage to current converter uses three op amps to drive a pair of power transistors. The current output is calculated as: IOUT=Vin/R6 Output resistance is over 50 M?. IOUT can range from 1 mA to the current ratings of T1 and T2....
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If possible, try to obtain TIP41 and TIP42 transistors, which are closely matched NPN and PNP power transistors with dissipation ratings of 65 watts each. If you cannot get a TIP41 NPN transistor, the TIP3055 (available from Radio Shack) is a good....
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A multiple automatic brightness control for a television receiver including a first automatic brightness limiter (ABL) circuit responsive only to relatively long duration changes in brightness-producing current and a second ABL circuit responsive to....
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This new loop antenna by Graham Maynard is his best design yet and I am proud to be the first to present his work. It uses one, six foot square, six turn loop, and is aperiodic in nature, covering the frequency range 50KHz - 5000KHz...
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The transformer has a 240V primary and has a secondary rated 24V at 2A. The bridge rectifier contains 4 diodes, their current rating needs to be high with respect to the transformers output current; if not the current may damage the diodes. I used MR751....
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STK4038 bassed 60 watt audio amplifier circuit project and explanation Using the STK4038X audio amplifier IC, can be designed a very simple high power and efficiency audio power amplifier. This circuit is manufactured by Sanyo Corporation and will provide a....
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L1 is 0.112uH (this tunes to the middle of the FM band, 98 MHz, with VC1 at its centre value of 33pF). L1 is 5 turns of 22 swg enamelled copper wire close-wound on a 5mm (3/16") diameter former. Alternatively, you can have a fixed 33pF cap instead of VC1 and....
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FIG. 284 is a practical power emergency lights, which is characterized only when lights turn on in case of a sudden stop electricity. Fluorescent lights will alternate power fo..
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The time base is first selected with Sl set for seconds or minutes, then units 0-99 are selected on the two thumbwheel switches S4 and S5. Finally, switch S2 is depressed to start the timer. Simultaneously, the quartz crystal-controlled divider circuits....
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CXA1019 FM RADIO CXA1019 is a one-chip FM/AM radio IC designed for radio-cassette tape recorders and headphone tape recorders, and CXA1019S has the....
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After the power is turned on, 220V AC by the step-down transformer T, VDI ~ VD4 bridge rectifier and Cl filtered output of about 10V DC voltage for the Darlington circuit and s..