Popular Circuits Page 230
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This circuit can extract harmonics from various waveforms. With a sloped input waveform, the comparator produces a pulse..
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While I would have liked a 4 channel chip with about 20 Watt per channel, the local parts store didn't have any yet, so I opted for two TA8215AH stereo chips, selected by their low price in this particular store. The design? Oh well, there isn't much to it.....
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The circuit consists of ICM7208 seven-decade counter U1, ICM7207A oscillator controller U2, and CA3130 biFET op amp U3. IC UI counts input signals, decodes them to 7-segment format, and outputs signals that are used to drive a 7-digit display. IC U2 provides....
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Welcome to the weblog where we discuss about electronic circuits schematics, PCB design, diy kits and electronic projects diagrams. The following is a small audio amplifier comparable to what you may come across a small transistor radio medium size. The....
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The LME49830 EF125WT1 amplifier PCB module showcases National Semiconductor s LME ultra-high fidelity power amplifier input stage ICs (drivers). The LME49830 is a fully complementary bipolar 200V input stage IC with 56mA (typical) of output current that has....
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Drive the light emitting diode is shown in the digital display circuit, the count signal to ICM7217 feet in the chip by the count and after the coding process to drive the digi..
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When the output is high, R3 and R4 are in parallel, and CI charges via Rl until the current in R2 equals that a..
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220V AC power via VD1 ~ VD4 bridge rectifier and voltage regulator circuit through R1, R2, VD5 cl composition and output..
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the sound system, the massive de-sensitized, and they defeated a maximum range. This can be increased if desired, you can have two tone controls, the lifting of 10 dB and a cut and the other with a little help and very subtle 3dB cut - it is quite....
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The Circuit Diagram shows a voltage regulator meeting these requirements that is built from discrete components. The two sets of component values are for a voltage of 6. 3 V (upper) and 12. 6 V (lower). Component: BC547 and BC557 Transistor, Diode, Preset,....
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The current source in the diagram, which react very fast to changes in the input signal, may be used, for instance, in certain measurements. Differential amplifier IC1 ensures that the potential across R2 is equal to the input voltage: Iout =Uin/R2. The....
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This project builds a Christmas lights controller for the GE Color Effects lights allowing programmed control of up to 8 sets of Christmas lights. Furthermore, it provides a function specific language for programming patterns for these lights and an....
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Flash analog-to-digital converters, also known as parallel ADCs, are the fastest way to convert an analog signal to a digital signal. Flash ADCs are ideal for applications requiring very large bandwidth, however, they typically consume more power than other....
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DC booster circuit shown in Figure flooded. Which is a step-up transformer circuit diagram, step-up transformer T can receive a small transistor radios changed rattan..
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Timing resistor R may be adjusted to any value between 10 K and 50 M to obtain a frequency range from 400 kHz to 100 Hz. Returning the timing resistor to the collector of Q1 ensures that Q1 draws its base current only from the timing capacitor Ct. The timing....
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This LM12 audio amplifier circuit will provide a high output power on a 8 ohms or 4 ohms load impedance. The maximum output power delivered by this LM12 audio amplifier is around 60 watts on a 4 ohms load and 100 watts on a 4 ohms load on each channel. A....
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To get the usual BPM range for music of between 40 and 240 BPM, that corresponds to periods of 1500 ms and 200 ms respectively. A BPM of 120 is exactly 500 ms. As it is, the circuit would require an R4 of 14. 5 Mohm to yield a period of 500 ms (120 BPM). I....
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Filter Regulators, solenoid valves, Quick Exhaust Valves, Flowline Pilots - Welcome to Bifold Fluidpower Ltd....
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The white feedthroughs are for the attachment of the RF high voltage to the D`s (not shown). The copper pipe normal to the pipe is the vacuum line. The D`s have screw posts on the side for attachment to the RF power supply leads (curled copper wire). You can....
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Circuit is shown at the same time produce a square wave, triangle wave, sine wave and outputs, especially for electronics enthusiasts and students do with an oscilloscope to ob..
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As shown for the voltage-controlled gain amplifier. Use FET gate voltage and the drain - source resistance between RSD to approximate logarithmic relationship may constitute a ..
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This unit can be useful as a short-range, single-channel remote-control. When the pushbutton in the transmitter circuit is briefly activated, the LED D1 in the receiver illuminates and an optional beeper or relay can be operated. Circuit operation is based....
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This 3 band equalizer circuit is an active filter network for bass, mid and high audio ranges. It is designed around the LM833 opamp from National Semiconductors. The output of this 3 way graphic equalizer is designed to be DC coupled, however due to slight....
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The battery charger pictured here is a real beast. It will dump 60 amps into a 12 volt battery bank that is low, and will taper down to about 10 amps charging current as the batteries fill. Total cost, $20! The basis of this charger is dead 1000 watt....
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Rechargeable lithium-ion batteries are rapidly becoming
the battery of choice for many battery-powered products.
These products include notebook computers, PDAs, video
camcorders, digital cameras, cellular phones, portable
test equipment and others.....
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The circuit uses a Signetics NE565 PLL (Phase-Locked Loop) as a detector to recover the SCA signal. The input to the SCA decoder circuit is connected to an FM receiver at a point between the FM discriminator and the de-emphasis filter network. The PLL, IC1,....
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WinBode traces automatically true and asymptotic Bode diagrams of any F(s) function of the complex pulsation...
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This circuit puts out a pulse when an object on the conveyor belt blocks the light source. The light source keeps the phototran-sistor turned on. This produces a high-logic-level voltage at the Schmitt-trigger inverter and a TTL-compatible low logic level at....
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This page features basic, visible light photo-detector circuits that can be used to detect trains. These methods would normally be used with the photo sensor mounted between the rails...
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Switched mode power supply units (SMPSUs) are popular but difficult to build oneself as well problematic when it comes to understanding their design princ....
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A very simple TV audio video transmitter circuit can be designed using this schematic diagram. This TV audio video transmitter circuit can be used to transmit video signals from VCR ( or some other device ) to a TV without using any cable. Video signals....
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A wide-range voltmeter circuit. This inverting amplifier has a gain varying from -30 for the 10-mV full-scale range to -0. 003 for the 100-V full-scale range. Diodes D1 and D2 provide com-plete amplifier protection for input overvoltages as high as 500V on....
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The IR transmitter connects to a telephone cir cuit, and transmits both sides of all telephone conversations to any line-of"sight location, within 40 feet. No !fOWer is taken from the central office, as long as all phones remain on-hook. The current....
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This circuit uses a 0. 1O 1W resistor connected in series with the output of a power amplifier. When the amplifier is delivering 100W into an 8O load, the resistor will be dissipating 1. 25W. The resulting temperature rise is sensed by a thermistor which is....
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This circuit, instead of dividing by an integer, divides the input signal by +1/2. With the feedback connections ..
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Various embodiments of the BB metal detector have been published, and it has been widely described in the press as a new genre. Instead of using a search and a reference oscillator as with BFO, or Tx and Rx coils as with IB, it uses two transmitters or....
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The circuit uses a 555 timer IC configured as an astable multivibrator, i. e. , it generates a continuous signal of a set frequency as long as its reset pin (pin 4) is held high. Since the ultrasonic transducer used in this circuit is one designed to vibrate....
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Afroman goes over the basics of how to use an operational amplifier to amplify tiny voltages, and builds a circuit to listen to very faint sounds with a microphone. For more information about amplifiers, Google inverting amplifier non-inverting amplifier ....
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The decoder`s operation is more complicated than that of the encoder. A behavioral simulation (Figure 2) shows the internal signals that are involved in the decoding process. Note that the spike on the "cd" signal is not a true spike; it appears only in the....
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Circuit schematic as shown below, using the MC2830 voice circuit is formed. Traditional voice circuit can not distinguish between speech and noise of the input signal. In a noi..
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The circuit uses 50 BUZ23 field effect transistors connected in parallel, tube blocking voltage of 100V. Required control power is extremely small, and there will be no second breakdown and conduction zone positive temperature coefficient phenomenon...
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The test circuit gives an indication of the capacity remaining in a battery. By noting the time in seconds that the LED remains on after you depress the test switch Sl. The circuit has proven reliable in testing NiCad-, carbon-, and alkaline-type....
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This is a simple single-zone burglar alarm. The basic design includes automatic Exit and Entry delays. It doesn`t include a siren cut-off timer. But with A Small Modification - you can add one to the circuit. The alarm will accept the usual types of....
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Here the complete electrical circuit diagram of line follower robot which built based on ATmega16. There are three modules of line follower robot circuit that are sensor module, microcontroller module and DC motor module. ..
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On the circuit diagram below show us a schematic which is used to set the speed of a low-power induction motor, such as those which can be found in fan....
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Smart Valentine`s Day gift - a movement-sensing box of chocolates with an LED message! Circuit diagram and How to build the project on ATtiny13 and Arduino...
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With this circuit you can make the amplifier volume control without having to use a potentiometer, but using a circuit with IC DS1669. For working voltage of the IC of this type was not 5 volts, but 4. 5 VOLTS to 8 Volt, but used in this circuit at 5 V....
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Here is a simple circuit using IC NE555 that can be used to generate metronomes. Such a circuit is very useful to those who learns music. The circuit is nothing but an astable multivibrator wired around NE555. The components R1, R2&C1 determines the output....
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For example, once the motion sensor picks up motion, we can program the arduino to turn on an LED, turn on a motor so that it spins, sound a buzzer off, etc. In this circuit we are doing here, for simplicity, we will simply turn on an LED once the motion....
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The circuit can be easily built to a small plastic box with telephone connectors in both ends. The circuit takes about 10-20 mA current, so if the circuit is not in use all the time it is best to use batteries. You can also use small wall transformer to....
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Bidirectional thyristor control, control the very trigger voltage output from the step-down transformer T 12V (when the water is turned on electrodes). It belongs to the withdr..
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Control electrical appliances using PC. Here is a circuit for using the printer port of a PC, for control application using software and some interface hardware. The interface circuit along with the...
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Tank circuit C2 and L1 is used to tune the transmitter. The antenna is coupled to the transmitter through C3 and must be a telescopic antenna or a length of hookup wire. At the receiver, the incoming signal is tuned by C4 and L2 before being passed on to the....
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RCA made some of the first commercially available CCD chips. A CCD (Charge Couple Device) is a silicon solid state imaging device that replaces the vidicon tubes of the past. CCD`s are made up a two dimensional array of photo detectors coupled to an array of....
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As shown by INA321/322 input current protection circuit shown. INA321/322 has the input end of the inner electrostatic discharge (ESD) protection diodes when the input voltage ..
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This project is based on ISD2560P IC which allows you to record 60 seconds voice and then playback it with very high quality. As shown in the schematic, the input soruce is an electret microphone. If a dynamic microphone is used, R2, R3, R4 resistors and C3,....
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Datagoo is built around the ATMEGA328P, the same processor used by many hobbyists for a variety of Arduino designs. When coupled with an FTDI FT232RL USB-Serial circuit, the board can be programmed with any computer with a USB port. Other design decisions....
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I built my own Lo-fi Arduino Guitar Pedal. I`m even using a similar enclosure work tossed out a couple of thinwire->twisted pair converters that I snapped up. I think the only major deviation is that mine only has one output at present- I could add a second....
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The circuit in Figure 1 shows a method of meeting this challenge with 100% margin. In other words, it presents approximately 10-M leakage resistance across the line. The basic relaxation oscillator has the LED of an optoisolator in the discharge path of the....
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This emergency LED light is simple, inexpensive and easy to build. The circuit to the battery and when the main source is not available, such as brownouts, white LEDs turns on automatically. Initially, the output voltage from 220V to 12V converter is fed to....
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In this circuit, an HA-4900 series comparator is used in conjunction with a D/A converter to form a simple, vers..
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An ultra-low-noise, low-distortion op ampthe AD797is combined with the ADS 11 op amp, which offers a high bandwidth and a 100-mA output drive capability. The composite-amplifier circuit serves quite well when driving high resolution ADC`s and ATE systems.....
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Next to the CLOCK input shows that it is edge-triggered, that is, it responds to sudden changes in voltage, but not to slow changes or to steady logic levels. The CLOCK input of the 4013 D-type bistable is rising-edge triggered, meaning that it responds only....
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Electronic thermometers as shown in the circuit. RT is the thermistor, A is an integrated operational amplifier. VD1 ~ VD4 composition marked by the scribe mushroom flow channe..
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Hi all,So I will be running with a high voltage pack in both the eCRX and the electric race bike. Both ....
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This fatigue testing circuit is very simple and easy to build and will determine how tired a person is. It has been discovered that the highest light frequ....
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This unity-gain follower amplifier has a CMOS p-channel input, an npn second-gain stage, and a CMOS inverter output. The IC building blocks are two CA3600E"s (CMOS transistor pairs) and a CA3046 npn transistor array. A zener-regulated leg provides bias for....
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This circuit will transmit a continuous audio tone on the FM broadcast band (88-108 MHz) which could used for remote control or security purposes. Circuit draws about 30 mA from a 6-9 volt battery and can be received to about 100 yards. A 555 timer is used....
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This amplifier is useful for applications where a 10- to 15-W peak-envelope-power (PEP) signal is needed i..
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The circuit consists of two parts: The LM335 and its adjustment. The output of the LM335 is 10 millivolts per degree C, with 25 degrees C corresponding to 2.982 VDC. A reference circuit provides a zero reference voltage. It is adjusted to (2.982 volts - (25....
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Here is the circuit diagram of a simple 3 channel audio splitter based on the IC NE5532. NE5532 is a dual internally compensated low noise opamp from Fairchild semiconductors. It has a high small signal and power bandwidth, making it well suitable for high....
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Control the two digits representing minutes; this circuit includes two shift registers, 30 resistors, and 30 LEDs. (All told, a particularly simplecircuit, really. ) Here`s the schematic: As I came closer to completing the circuit design, it occurred to me....
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The device serves to quickly establish the status of an indicative power cells. I built it for his children, so they can determine the degree of self-discharge batteries in a variety of toys. WAS tester designed to test the fast primary (zinc, alcaline)....
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This device has long battery life and low power strain. Another features that this device has are protecting the battery and LED from overloading, trouble free operation such as overtemperature, over voltage, time-out function, undervoltage lockout, and....
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Lead acid batteries often fail prematurely due to over-charging, under-charging, deep discharging and low electrolyte level. All of these can lead to sulphation of the plates which leads to high internal resistance and eventual failure. Normally, this....
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This project is an older design and has most likely been superceded by a newer one. However, it is still a viable design and useful for your home-brew synth. Sorry but most of these do not have circuit descriptions, parts lists or PC board layouts (They....
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The circuit can be selectively tuned in two very close in tone. Selective frequency is determined by the value of the feedback circuit collector and the base of Q1 between the capacitors and resistors..
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As this controller has been designed primarily for controlling model trains, it is designed to deliver around 12-15 Volts, although this system should work with as low a voltage as 3V (indeed it also works on a 6V supply to control some accessories I have).....
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Transistor is a semiconductor device used for switching and amplification of weak signals. This article explains how a transistor work and the working of transistor as a switch. At present, transistors are applied in most of the electronic equipments for....
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The board is rather simple and is based on a PCF8574 providing to the I2C the output of a CD 4040 counter. A dip switch is provided to select the PCF8574 address and some leds for power on and wind activity. The DIP switch was not soldered thus the circuit....
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The continuity tester is for tracing wiring on printed circuit boards. It only consumes any appreciable power when the test leads are shorted, so no On/Off switch is used or required. The applied voltage at the test terminals is insufficient to turn on....
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This digital volume control has no pot to wear out and introduces almost no noise in the circuit. Instead, the volume is controlled by pressing UP and DOWN buttons. This simple circuit would be a great touch to any home audio project...
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This is a simple single-zone burglar alarm circuit. Its features include automatic Exit and Entry delays and a timed Bell/Siren Cut-Off. It`s easy to use. First check that the building is secure and that the green LED is lit. Then move SW1 to the "set"....
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This is a fm radio receiver circuit which can be used with PC.PC radio REGULATIONSA) With the P1 we regulate the intensity of sound.B) With the P2 we regulate the frequency of reception.C) Optionally: If you want to check the frequency with your PC it will....
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Pure A class is the most simple topology for designing an amplifier! The tube or the power transistor is loaded directly by the speaker (often thru a transformer, fro impedance matching!), and is biaised at the current necessary for full modulation (that....
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This article presents a description of a 70cm wideband transceiver for duplex operation. The modules are designed for operation in a 200 kHz wide duplex channel, freely selectable from 430-440 MHz with a 100 kHz channel spacing. First prototypes were....
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This versatile circuit provides a selection of different switching modes. It can be used as two entirely separate toggle switches - with each push button successively energizing and de-energizing its own relay. Or the two switches can be interlinked with....