Popular Circuits Page 89
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Here we have three choices, with which we can make electronic switches that use our touch or pressing (push button). We thus exploit the very big resistance of entry, that present the gates CMOS. In the fig.1 we have two gates NAND or NOR (IC1), connected as....
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This is my first successful vacuum tube project. The output of this small amplifier in which a 6V6GT output pentode is connected as triode is about 4. 5 watts. This project involves a single ended audio amplifier, which consists of a resistive input network,....
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A class-A audio amplifier is pretty wasteful of power but when plenty of power is available the simplicity is attractive. Here is a simple darlington transistor example intended for use with a 5 volt power supply. This circuit and the following aren`t for....
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555 timer is used as clock to drive RS7490 decimal timer, BCD output to 7 section LED. To adjust R1 can change the clock frequency....
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Here`s a circuit diagram for setting the brightness of the light bulb. You simply use the second battery to make the fruits of this circuit works. Example usage of this circuit is to adjust the brightness of images for close-up photo shoot with a digital....
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RFID is a great technology, has may uses and become very cheap and easy to implement these days. This tutorial describes how to interface a RFID Reader with a common Atmel AVR MCU....
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This is iKHz sine wave generator circuit built based on configuration of inverted Wien bridge (see C1-R3 C2-R4). R5 and R7 used for output amplutide setting. Set R5 to read 1V RMS on an Audio Millivoltmeter connected to the output with R7 ro....
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This is a design for a high impedance DC voltmeter. This circuit is design with built by uA741 IC. This IC is a op-amp non-inverting DC amplifier. The IC have negative feedback that is through a DC meter requiring 1mA for full scale deflection. This is the....
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A Simple Light activated switch This is the circuit diagram of a light activated switch based on National Semiconductors comparator IC LM 311 and a LDR. The circuit is based on a voltage comparator circuit wired around IC 1. The non inverting in put of IC1....
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HI ALL, PLZ LOOK THIS CIRCUIT. I BUILT THIS LAST DAY. BUT THIS IS NOT WORKING. I CHECKED ALL CONNECTIONS AND PARTS. BUT ALL IS OK. WHEN I TURN ON THE....
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When measure video signal with oscilloscope, video line selector is very useful to find a scan line. The line selecter generates trigger pulse at selected line, oscilloscope will display only selected line. This is a very simple video line selector...
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The XSV-300 board is a versatile FPGA development
board providing a 300-Kgate FPGA,
programmable clock oscillators, standard PC interface
components (e.g. a USB-Transceiver),
Flash memory, RAM and 7-segment displays...
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This is simple portable audio amplifier circuit. This circuit built based on IC TEA2025 which is a monolithic integrated audio amplifier in a 16-pin plastic dual in line package manufactured by UTC. Circuit has Internal Thermal Protector. It is designed for....
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The objective of this controller project is to have automatic block and switch control of five separate engines that run on two completely independent loops of track. Part of each loop is outside (public) and part is inside (hidden from public view). The....
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Feedback oscillator circuit inductance shown, transistor 3DG3. Component Parameters Reference values are as follows: 1) transistors 3DG6. 2) Resistance: Rhl 91kfl, RBZ llkfl, R..
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This Guitar Amplifier electronic architecture adopts a able-bodied accustomed ambit cartography for the ability amplifier, application a single-rail accumulation of about 60V and capacitor-coupling for the speaker(s). The advantages for a guitar amplifier....
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This tube tesla coil was built inside a CPU power supply unit. It was first built on a workbench using components and jumpers for connections. The tube used is a 4X150 transmitting tube that used forced air cooling. An old oscilloscope transformer was used....
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This circuit will power a 6 inch 4 Watt fluorescent tube off a 12 volt supply, consuming 300 mA...
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With the aid of an (old) moving coil instrument it is very little effort to make a simple voltmeter that, at a glance, indicates the status of a telephone line. Because the input impedance of this circuit is very high, there is no problem in having it....
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In this circuit the intensity of LED will vary in a ramping fashion. The circuit consists of three ICs: Two 555 timer ICs and one LM393 op-amp. IC1 and IC2 are wired as oscillators to produce 10 KHz and 1 Hz frequencies respectively. These two frequencies....
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FIG SD501E is J tie fan IC, which has the following characteristics a 7 5 ±progressive Timing: round strong, medium. Weak block touch speed; normal, natural wind and sleep wind..
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This fast circuit is compatible with any amplifier that has a line or high-level input (radio, CD) that allows you to mix the
signals from a microphone with the music source of your choice also add sound effects to your voice,
which are adjustable in....
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As we know that all semiconductors have this bad habit of changing its basic characteristics in response to ambient temperature changes. Especially basic electronic components like transistors and diodes are very much prone to their case temperature....
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Any number of normally open switches may be used. Fit the mercury switches so that they close when the steering is moved or when the bike is lifted off its side-stand or pushed forward off its centre-stand. Use micro-switches to protect removable panels and....
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This is the circuit that sparked off all the other Link Telephone Intercom designs. Originally designed back in 1996 with heavy duty relays and their contact banks, it was updated late last year with the addition of IC1 in place of a simpler transistor....
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These two circuits are multi-range timers offering periods of up to 24 hours and beyond. They can be used as repeating timers - or as single-shot timers. Both circuits are essentially the same. The main difference between them is their behaviour in....
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This circuit may be used to replace the single current limiting resistor often found in dirt cheap battery chargers. The alternative shown here will eventually pay off because you no longer have to throw away your NiCds after three months or so of....
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First introduced by the Signetics Corporation as the SE555/NE555 about 1971. Pin connections and functions: (See schematic below for basic circuits) Pin 1 (Ground) - The ground (or common) pin is the most-negative supply potential of the device, which is....
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The circuit is built around popular CMOS oscillator-cum-divider IC 4060 and small audio amplifier LM386. IC 4060 is used as the multitone generator. A 100 H inductor is used at the input of IC 4060. So it oscillates within the range of about 5MHz RF. IC 4060....
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Circuit consists of three parts is light-control section 5: Two foot f light time control section; the third is the implementation part of dry i power supply section. JCz (NE55..
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The circuit functions like a unijunction transistor relaxation oscillator. The base of the lower PNP transistor is biased at roughly half supply. As the 100pF capacitor is charged up through the 1G resistor, the base of the upper NPN transistor reaches a....
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Below shown circuit will be automatically switched ON and OFF during night and morning times respectively. In above circuit R1 can be used to adjust the sensitivity. And the working of the circuit is very simple. The LDR will have very low resistance during....
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Understanding of the concept of "Hysteresis" is very important. When generally considered, this phenomena gives rise to losses seen in the dielectric of a capacitor or lamination of a transformer, these can be seen in the form of heat(emission of infrared....
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This circuit (figure 1) will impose a maximum slew rate on a signal; positive and negative rates can be independently controlled. The circuit is useful in servo applications where the error signal needs to be limited to be within the power rails to ensure....
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Do not drink and drive, I wish you a safe journey home Language Integrated Circuits ..
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Borrowing techniques echo sounder used to measure ocean depth, distance measuring device can be made with an ultra sonic. Gauge this distance using the same circuit with Digital Clock in the last article, coupled with a series of transmitter and receiver....
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The first section of the 555 timer is wires as an astable oscillator with R2 and C1 setting the frequency. The output is available at pin 5. The second section is wired as a phase inverter. That output is available at pin 9. Resistor R3 and R4 keep output....
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This is Circuit MOSQUITO REPELLANT. By High Frequency Sound. Use a electronics part ,easy to find and low cost. To See Circuit, have IC 555, 4017,....
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This circuit based project demonstrates the working of 555 timer in astable mode to generate pulses of time period 0. 5 second. This pulse can be further used for anything where we need a pulse such as to blink a LED or to create fashionable blinking lights.....
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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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Four button RF remote is used to turn ON / OFF four different devices independently. Any of the four outputs can be configured to work independently in either toggle or momentary mode. Outputs are buffered by BC549 NPN transistors and can drive low voltage....
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This circuit gives multiple "stop-action" photographic effects like showing a bouncing ball in up to nine locations in a single photograph. The circuit will automatically fire the bulbs sequentially with the time between each firing variable. The circuit is....
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If your circuits experience frequency overvoltage conditions, continually replacing blown fuses can get pretty expensive. However, this shutdown circuit overcomes that deficiency by replacing the fuse with a relay and a low-current SCR. When the input....
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BoardMaker3 is an integrated environment for the design of Printed circuit boards, offering a comprehensive set of tools that allow schematic entry, Spice simulation, 3D viewing and an Autorouter Interface. With a Customised graphics engine and a user....
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The following circuit shows about Circuit an Infrared Toy Car Motor Controller. This circuit based on the 4047 and4017 IC. Features: 16V Capacitor, 100k Resistor, Double IC. Component: IC, Switch, Diode, LED, Resistor, Capacitor, Motor, Transistor.....
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A 12 Volt solar power system can provide power to a wide variety of devices. Some examples include: lighting systems, cellular phones, CB and Ham radios, car stereos, televisions, recording equipment, fans, water pumps, and other low voltage DC loads. With....
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Human reaction speed test circuit as shown in FIG. NAND gate D25, D26 and other components multivibrator output clock pulse period is about 50ms. IC1 composition 8 right register, D1 composed of boot delay circuit output signal as its serial input data. Just..
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Circuit shown in Figure 3-123. When you press the stop button SBz, contact KMi release, cut off the power to the motor, at the same time, KMz pull, turn the electromagnetic bra..
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BA328 with Dual preamplifier circuit having fewer external components, easy installation features, single 8-pin DIP package. Circuit characteristics are as follows: wide operat..
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As shown in FIG TOPSwitch FZ chip switching power supply circuit diagram is controlled by the MCUs. The microcontroller can use inkjet printers, laser printers and other comput..
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This was a quick experimental prototype I put together based on an elegantly simple design by Doug Forbes, which uses common vacuum tubes. (Since Mr. Forbes`s original site is no longer available I have taken the liberty of reproducing his schematic and text....
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The circuit arrangement consists of a photo-amplifier which feeds a voltage derived from varying light levels in an enlarger to a pair of peak detectors. One follows the peak positive voltage and the other the peak negative voltage. The capacitors used for....
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The phototransistor and photodarlington couplers act as de relays in saturated switching at currents up to 5 mA and 50 mA, respectively. When higher currents or higher voltage capabilities are required, additional devices are required to buffer or amplify....
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LED light chaser circuit typically refers to an electronic configuration able to generate or illuminate a group of LEDs in somepredeterminedsequence. One popular IC 4017 is very commonly employed for making this type LED sequencer circuit. The IC basically....
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An introductory post on how to use serial communication in PIC Micrcontrollers to send data to PC. What comes first in your mind when you listen serial communication ? Yes, how to send data in series. All this time you have been working single bits, turning....
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The LED blinks as intended, then stops for an arbitrary time, flashes again a different number of times, off again etc. There doesn`t seem to be any cyclic behaviour to it. It starts working without any external input (i. e. nudging it) so doesn`t seem like....
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Here is an ultra sensitive earthquake detector circuit that can sense seismic vibrations. It can be used to detect vibrations in the Earth. So it is an ide....
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This circuit is designed to drive the 1W LEDs that are now commonly available. Their non-linear voltage to current relationship and variation in forward voltage with temperature necessitates the use of a 350mA, constant-current power source as provided by....
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This projects will describe a simple Servo Reverser that can be cheaply built using a CD4001 NOR gate, 4 resistors, 3 capacitors and one variable potentiometer (see schematic below)...
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This logic probe uses a single CMOS IC and shows three logic conditions, High, Low and Pulsing. In addition if the probe input is neither hi or low (the high impedance state of tri-output logic ic`s) then no LED`s will light. Power from the logic probe is....
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A simple count-down LED timer that counts in minutes and seconds. Three buttons below the LED provide control of the unit, allowing you set the desired countdown time in minutes and seconds and a start/stop button.
Completion of the countdown is indicated....
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A basic Wien Bridge Oscillator using a filament lamp with an op amp. It is a property of filament lamps that the resistance of the tungsten filament increases in a non-linear manner as the filament heats up. The lamp in Fig. 3. 4. 1 is connected in the....
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Project to control single phase ac induction motor in which I planned to use two IGBTs, one for switching the PWM to the motor (for AC chopping, PWM frequency is fixed @16khz) and one for freewheeling the motor. A symbolic circuit is included here: I know....
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Q1 and Q2 form an ALL-ON ALL-OFF circuit that in the off state draws no significant current. P1 starts the circuit, the relay is turned on and the two ICs are powered. The lamp is powered by the relay switch, and IC2 is reset with a positive voltage at pin....
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A radio camera on a model railway should transmit constantly while the train is moving and continue transmitting for a few minutes after the train stops ..
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Here is our robotic project; Robotrex. A robotic dinosaur. Its name comes from the words "Robot" and "tyrosaurus-Rex". Inspired from our older projects "Bigfoot" and "the Goggles", this project was built specially for our endtas. com fair stand in 2004 Izmir....
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It is illegal in most countries to operate radio transmitters without a license so take care with transmitter circuits. This FM low power circuit may be tuned to operate over the range 87-108 MHz band II, with a range of 20 or 30 metres. Active components in....
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Hello how can find the output of capacitor microphone in theory or augur it without test in? for example in these circuits what is the output of each....
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This temperature monitor alarm circuit continuosly monitors the room temperature and beeps when the temperature drops below 20 degrees centigrade. This capability to constantly monitor the room temperature can help lower your air-conditioning costs by....
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A timing and counting circuit using integrated circuit chips with seven-segment LED displays is used to display current lap time, the previous lap time, and also the total number of laps completed on an assembled 1/64th-scale slot car racetrack. A switch....
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Make Z3801A GPS-disciplined oscillators more useful by making 1 PPS and additional 10MHz signals available on the rear panel, and providing a 1 PPS signal on the DCD line of the serial connector so the unit could serve as a reference clock for an NTP server.....
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Perhaps the trickiest part in building a solid state tesla coil is the bridge or switching circuit. The bridge switching circuit is the heart of t....
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The oscillator circuit uses a center-tapped transistor output transformer to serve as a load for the collector of Q1, supply a feedback signal for the base, and serve as the output winding for driving the speaker. R1 supplies dc bias and C1 completes the ac....
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The 1996 Suzuki Esteem Cooling Fan system consists of control relay for: radiator fan (located in relay box), air conditioning fan motor, radiator fan motor, condenser fan motor, junction box, fuse and relay box, engine control module. The following circuit....
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In this file is a schematic for a simple wiretap & instructions for hooking up a small tape recorder control relay to the phone line. First, I will discuss taps a little. There are many different types of taps. There are transmitters, wired taps, and....
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This infrared detector can be used to detect the presence of modulated infrared signals in its vicinity from any electronic source, for instance, an IR han....
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They are op-amp based filters and are most useful in the audio frequency range. These parts calculators are based on formulas and tables from the book " Electronic Filter Design Handbook " by Arthur B. Williams. Bandpass filters pass a contiguous range of....
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The inverter chops the 12 Volt DC Battery voltage into a square wave voltage of 50 cycles per second and duty cycle of 25%, transformed by transformer Tr1 to 230 Volt rms. IC1 forms the oscillator with 100 cycles per second (120 cycles per second for 60....
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Power for the circuit is provided by B1, a 9-V battery. Total battery current is 14. 5 mA, so an alkaline battery should last about 250 hours. Audio signals are picked up by microphone MIC1. The output of MIC1 is buffered by Q1 to maintain the 3000- © load....
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PulsePar turns a PC into a multi-channel pulse generator utilizing the parallel port. The period, duty and phase of each channel are adjustable so as to be used in PWM systems as well as in testing servo and stepper (stepping) motors. If you have an old PC,....
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After adding the negative feedback circuit, since the adjustment object and inertial measurement feedback link, prone to oscillation. To this end the use of electric voltage di..
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We can say in simple words that AFC will lock the receiver to any valid RF signal. Below, we can see a basic block diagram of an receiver. The VCO is mixed with...
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Developing a transmitter small enough to be implanted in the body of a rat, fast enough to transmit four hundred sixteen-bit data samples per second, powerful enough to be detected at a range of three meters, and efficient enough to operate for three months....
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This is one of abounding accessible variations for a Symmetrical SRPP Preamplifier based about the 6DJ8 / ECC88 ancestors of tubes. The SRPP ambit has additionally been referred to as a SEPP, Totem Pole, Mu Follower, Mu amplifier and Cascoded Cathode....
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The amplification of this circuit is about 12000 times, the bandwidth is 0.5~14MHz, the input resistance is 700?, the output resistance is 35?(measured with 5MHz), the output noise level is 0.6~0.8V. In figure, T1, T2 are direct coupling amplifier, they are....