Popular Circuits Page 178
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Here is the latest and abundantly bigger TX200 VFO/VCO FM transmitter. The best able transmitter to date that can be angry into aerial allegiance stereo PLL based 200mW FM transmitter. It is a absolute ambit for transmitting your music about the abode and....
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To avoid distortion of the image, when receiving data through the UART, for VGA, it is recommended to make the data exchange with the terminal in approximately 300-600 us after a signal of vertical synchronization (VSYNC)...
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LED sequencer: follows the rhythm of music or speech, 9V Battery-operated portable unit The basic circuit illuminates up to ten LEDs in sequence, followin....
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This circuit uses the popular and easy to find LM3914 IC. This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator) and can be powered from almost every source. Electronics project....
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The overall task of the optical receiver is to extract the information that has been placed on the modulated light carrier by the distant transmitter and restores the information to its original form. The typical through-the-air communications receiver can....
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With the values shown, this circuit has a ±0. 025 °C accuracy over 0 ° to 100 °C. The input offset voltage of the LT-1001, and its drift with temperature, are permanently trimmed at wafer test to a low level. However, if further adjustment of VOS is....
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The name of our game, LED Zeppelin, is a play on words. It comes not from the pop group of the same name but from Graf Von Zeppelin, a German who invented the first rigid air ship in 1900.
The association fits perfectly. The game consists of six LEDs and an....
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The cause may be dry solder joints, defective LEDs etc. , but also a flat battery (perhaps due to stuck key). The human eye is unable to perceive infra-red light. By contrast, an ordinary photo transistor like the BP103 has no problems working in the....
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This project Microcontroller based college automation system , aims to eliminate this problem especially in case of colleges and schools. In this project conventional notice board is replace by a well automated device. The circuit enables the user to hear....
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The IR detector (IC3) controls an LM 7555 CMOS timer (IC2) which operates in mono stable mode. When the beam is broken, IC2 is triggered and its pin 3 output goes high for about half a second. This extinguishes LED1 and turns on transistor Q1 to drive a 5V....
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Circuit car wipers speed controller is shown in Fig. It can easily shake wiper speed between every second to ten times per second for any change, flexible and energy saving...
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This has a stable trigger 100 m V sensitivity at 50 MHz. The FETs comprise a simple high-speed buffer and the LT1016 compares the buffer"s output to the potential at tbe trigger level potentiometer, which can be of either polarity. The 10-KO resistor....
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Pulse size and width are independent of the pulse energy or other properties of the event. Geiger-Mueller tubes are less sensitive to non-gamma-ray radiation, and their dose-rate calibration accuracy is poor. They are widely used because they offer a good....
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RF Cafe visitor Jim L. requested that I post this Build Your Own Vibrato article from the December 1957 edition of Popular Electronics. "Make like Elvis with an `electronic` throbbing guitar, " is the pitch line. Vibrato, for the non-musically inclined, is....
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The transmitter offers a optical link (infrared) for headphones. Three infrared leds (ir) are polirised by T1 current, P1 is used to adjust the current level. Current consumption of this headphones infrared transmitter is about 60mA at 9V....
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Automatic Humidifier can be used to control humidity control family, it can also be used hatchery poultry farms or juvenile poultry house climate control. When the humidity is ..
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The heart of the circuit is the two transistor flasher with frequency modulation applied to the base of the first transistor. When the pushbutton is depressed, the frequency of oscillation climbs to a peak and when the button is released, the frequency....
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A touch switch is a switch that is turned on and off by touching a wire contact, instead of flicking a lever like a regular switch. Touch switches have no mechanical parts to wear out, so they last a lot longer than regular switches. Touch switches can be....
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The TDA1029 is a dual operational amplifier (connected as an impedance converter) each amplifier having 4 mutually switchable inputs which are protected by clamping diodes. Signal-sources switch can be made in various mods : Electronic parts required by this....
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Using this low-cost project one can reproduce audio from TV without disturbing others. It does not use any wire connection between TV and Loud Speaker. In place of a pair of wires, it uses invisible infra-red light to transmit audio signals from TV to Loud....
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LED flasher circuit can be built based on 555 IC. Using 555 IC, the flashing rate can be more flexible to adjust. This LED flasher circuit is similar to our....
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In this Arduino-based project, we will build a lamp with multiple light displays: color sequencer, dimming light, color chaser, firelight all selected by a touch bar on the circuit board. We will be going the minimalist way for this project, filling the....
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In many µC applications, a signal conditioner modifies an analog input signal from a sensor and passes it to the µC for processing. The last stage of the signal conditioner is always a device that transforms the signal level to a value acceptable for the....
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CMOS clock circuit can drive a multi-digit gas discharge display, simple circuit does not include an alarm, which can be flashing colon morning and afternoon show. The circuit ..
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The 7915 (at least the "made in Morocco" I used) needs a small load (some mA) to work correctly. If you get funny voltages (-18.4V or so), put a resistor from the 7915 output to ground (2k2 works good). Or it might be a good idea to put the "power on" LED....
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This is a 16X2 switcher so it gives me plenty of room for expansion. While the cameras are nice, what I really wanted was the ability to pan and tilt selected cameras to change the view if necessary. I did quite a bit of searching and most of the pan and....
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Security is a prime concern in our day-today life. Everyone wants to be as much secure as possible. An access control for doors forms a vital link in a security chain. The Microcontroller based Home Security System can be adopted at Home it has various type....
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This circuit is xenon lamp flash detector. It has a very low standby current requirement yet has very high sensitivity toward the light flashes from a xenon lamp. When connected to a flip/flop it can serve as an on on/off controller...
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Here`s a simple schematic of one of the parts, the idea is that if the probed voltage is below half point, one LED will be on, otherwise second one will be on. Also, now I think I`ll need to oompff the power on this thing, proper dc motor with some gearbox....
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Flash-back to the 60's with this 5 channel unit with up to 100 watts per channel. This unit uses a PIC16F84 with an 8 bit A/D. The signal from both stereo channels is combined and digitized. Each of 5 frequency bands is processed using a 16 point FFT.....
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The following circuit shows about Solar Tracker Circuit Diagram. This circuit based on the LM339 IC.Features: 10n ceramic capacitor (103z), 1meg ....
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A switch is an electrical component that can break an electrical circuit, interrupting the current or diverting it from one conductor to another. A switch may be directly manipulated by a human as a control signal to a system, or to control power flow in a....
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The circuit takes its input from the "zero-crossing detector", which provides it with a 0-to-1-to-0 pulse to "set" the R-S flip-flop and release the ramp circuit (A to Ramp) for it to start the ascent of the timing ramp...
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Well, it's pretty much a PAiA preamp - usual input circuity followed by one half of dual op-amp rigged in fixed 20dB amplification circuity, followed by second stage which is adjustable for up to 40dB amplification, for up to 60dB total. The power supply is....
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All miniature electronic devices operate off batteries. Some of them need higher than the standard battery voltages to operate efficiently. If the battery of that specific voltage is unavailable, we are forced to connect additional cells in series to step up....
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No setup is required: if correct values are used for resistors R3 to R7, LED D1 will illuminate at 0dB input (0. 775V RMS), LED D2 at +5dB input (1. 378V RMS) and LED D3 at +10dB (2. 451V RMS). The circuit was optimized for low current consumption as it was....
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Simple, two-wire, remote monitoring unit, Three-LED level display, 9V battery powered The whole project was developed on a friend s request. Its purpose w....
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As shown in the frequency of electronic locks by the PLL audio decoder LM567 composition, the electronic lock circuit uses the LM567 audio decoding characteristic, that is, whe..
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Recent innovations in process and circuit design have
enabled the release of three new RS485 transceivers: the
LTC®1481, LTC1483 and LTC1487. These devices share
an improved receiver circuit which features 80mA quiescent
current operation (driver....
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One problem I faced when starting to tinker with my Arduino was just how was I going to go about drawing circuit diagrams for my creations. There seemed to be a huge choice of packages out there that allow you to draw a schematic diagram, some free, some....
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This circuit calls more Free Running Multivibrator work resemble Flip Flop. Which encourage itself repeatedly. The Q1 and Q2 be Transistor PNP be usable general (2N3906, 2N2907, etc. ) The R1 and R2 limit current that flow through LED the bilateral. If....
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This circuit is a simple form of the commercial UPS, the circuit provides a constant regulated 5 Volt output and an unregulated 12 Volt supply. In the event of electrical supply line failure the battery takes over, with no spikes on the regulated supply.....
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This is another design generated at the request of my father. It is designed to be a dimmer for a 12V reading lamp, but could also be used as a motor speed controller (for a drill). The circuit pulse the voltage seen by the load an the pulse width is....
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This software was written for this hardware. Therefore the pin allocation of the Atmel Attiny2313 in this curciut corresponds to the orginal of So the software will run on both hardware platforms. Important note: The processor AT90S2313 requires an external....
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These circuits are based on TEA2025 is a monolithic integrated audio amplifier in a 16-pin plastic dual in line package manufactured by UTC .Circuit has an Internal Thermal Protector. It is designed for portable cassette players and radios. You can also use....
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The circuit may be used as a sensitive current detector or as a voltage detector having high input impedance. Rl is set so that the voltage at point (A) is V2 to % volts below the level that fires the 2N494C. A small input current (Iin) of only 40....
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This is danger beep circuit. It use 555 integrated number circuits build to are a stable mutivibrator that be valuable duty cycle 5% driver loudspeaker....
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By means of a Relay, employed to drive a water pump, this circuit provides automatic level control of a water reservoir or well. The shorter steel rod is the "water high" sensor, whereas the longer is the "water low" sensor. When the water level is below....
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This is simple logic probe circuit. Logic probe is used to determine if a point in a circuit has high or low state when the circuit is in operation.? Here is...
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The circuit shown here is a simple Static 0-9 Display can be used in many applications. The circuit is based on 7490 asynchronous decade counter (IC2), a 7-segment display (D1), and a seven-segment decoder / driver IC 7446 (IC1). The seven-segment display....
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Place the transciever and the chip antenna very close, then there is no need for a 50 ohm transmission line right If so, can I somehow merge those two matching circuits into one and thus reducing component count..
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There are not many AM transmitters that are easier to build than this one because the inductor is not tapped and has a single winding. There is no need to wind the inductor as it is a readily available RF choke (eg, Jaycar Cat LF-1536). To make the circuit....
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Servos became valuable products for any variety of plans, like robotics, automation or only remotely controlling some thing, for example model vehicle steering. They`re reasonably low-priced and also simple to have hold of, however controlling them can be a....
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This simple aerial booster circuit design might be an alternate or a hobby project for making such an aerial booster device for the Citizen Band (CB) radio..
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Do you drive an older car without an automatic "lights-on" warning circuit If so, you`ve probably accidentally left the lights on and flattened the battery on one or more occasions. This headlights reminder circuit will prevent that. It`s more complicated....
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The metal detector circuit is composed of the probe oscillator, reference oscillator, oscillation signal processor, mixing amplifier and ammeter PA and other components, and the circuit is shown as the chart. Probe oscillator is composed of the oscillating....
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As shown in the circuit is a state of the flash output can change the speed of lighting control circuit according to the strength of eight timing of the audio signal. Circuit p..
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GPIO, as may have been explained in other tutorials, stands for General Purpose Input/Output and a GPIO pin can be set high (taking the value 1) by connecting it to a voltage supply, or set low (taking the value 0) by connecting it to ground. The Raspberry....
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If the battery voltage exceeds about 11 V, current flows through R1, D1, and R2. The voltage produced as a result of current flow through R2 is sufficient to bias transistor Q1 into conduction. That places the collector voltage of Q1 virtually at....
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Will be examined the digitization of temperature to reveal not enough yet its course of change of complete response and change the law in some detection fields, and it is one of the effective methods to draw out the curve of trend. A solution to sample the....
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LM555 timer circuit is similar to the one above but employs two stages so that both the pulse width and delay can be controlled..
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This circuit produces a tone according to the button being pressed. Only 1 button can be pressed at a time, that`s why it is called a monophonic organ. You can change the 1k resistors to produce a more-accurate scale...
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I have completed this above mentioned project. People have had SMS contl on Siemens/Ericsson/and other phones but they have a modem on them, and comapratively simpler coding is needed. Older nokia fones use FBUS protocol which is their (nokia) own difficulkt....
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Army Radio Sales Co. specialises in military communications equipment for the ham radio operator or collector. Military Radios From Many Countries For Sale, We Buy and Swap Military Radios and Accessories....
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The following schematic has been taken from buildcircuit. com. The following circuit can work as a music generator, Infrared transmitter and LED blinker depending upon the values of R1, R2 and C1. Making a minor modification in the previous circuit makes it....
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The following circuit is a schematic of mains surge suppressor circuit manufactured by StrG¶mfors and sold undel model name "Ahstrom Transienttisuoja 23 386". It is designed for protecting sensitive electronic devices agains overvoltage transients in normal....
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As shown in the diagram above, it is a radio remote control dimmer circuit. The radio remote control dimmer circuit adopts micro radio transmit/receive module and light modulation ASIC. So the circuit is concise and easy to produce. It works reliably. And....
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The Motherboard, or Mobo v4. 3. 4 BETA, is an addon board to plug onto the Softrock v6. 3 RxTx, to transform it into an all band (160-10m) HF transceiver electronically controlled via USB. Mobo v4. 3. 4 BETA is developed by a team of radio amateurs. The....
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An on-board oscillator and a 17-stage divider compose IC1. By connecting a standard 3.58-MHz, television color-burst crystal as shown, an accurate source of 60-Hz squarewaves is generated at the IC"s output, pin 1. Those pulses are then fed to IC2, a 4024....
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When the magnet approaches, N flux inside the bifilar coil increases. An opposing flux is produced by the coil and an EMF is generated across L1 and L2. The EMF across L1 applies + voltage to B-E terminals of Q1 and turns it ON. Q1 saturates rapidly and a....
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Hi-fi 100W mosfet power amplifier circuit . Operates from 45v dual supply. 100W to 8 ohm speaker, 160W to 4 ohm speaker, low distortion....
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High Current Variable Power supply Circuit Diagram. The popular Variable voltage regulator IC LM317 can handle only up to 1 ampere current and hence it is not suitable for making a high current variable power supply ..
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Build this circuit in any way you want, keep in mind that there is high voltage involved, make sure that everything is properly insulated and that bare conductors are not closer to eachother than 2mm to prevent any arcing. This circuit is basically a voltage....
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When switching loads with the aid of a thyristor, a large amount of RFI can be generated unless some form of zero crossing switch is used. The circuit shows a simple single transistor zero crossing switch. Rl and R2 act as a potential divider. The potential....
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A very simple motion transducer can be constructed using the circuit shown. The output is biased to one-half the supply voltage. This requires special interface circuitry for the signal readout. One simple method is to use a zero center meter in a bridge....
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A calculating resonance capacity from formula (1) and NFC Tag LSI are set to antenna circuit board, and measured resonance frequency, after that, adjusting resonance capacity..
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This circuit is from Tomi Engdahl's page. It describes a nifty little TDR that, when combined with a regular oscilloscope, can be used to find discontinuities on long runs of cables...
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This circuit is intended to signal, through a flashing LED, the exceeding of a fixed threshold in room noise, chosen from three fixed levels, namely 50, 70 & 85 dB. Two Op-amps provide the necessary circuit gain for sounds picked-up by a miniature electret....
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This is a battery powered IR Link which may be used in more than one room. The standby current is extremely low - so battery life is excellent. And by shutting down in the presence of extraneous IR radiation - it copes with the problem of excessive output....
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This is a well designed basic FM transmitter that you can easily recive the signals transmitted from this transmitter in a 1-2km range with using a normal FM reciever. Another property of this circuit is that the bobin is placed on the printed circuit board.....
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Power a rs232-TTL converter circuit using the serial port so i dont have to have an external power supply to do the job. I read somewhere that the DTS, RTS and TD pins are able to do this. As I am already using the TD pin to send out data, is there any other....
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There is not much to this circuit. Above are all the graphics and pictures. After you gather all your materials, take your transistor and wire it up....
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Flip-flop circuit having a memory function pulse signal. It has two stable states: the transistor VTi deadline, VTZ conduction;..
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The figure shows the use of a CD4016 analog multiplex to multiplex the digital outputs back to the FUNCTION input. Since the CD4016 is a digitally controlled analog transmission gate, no level shifting of the digit output is required. The CD4051's or....
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Here is a deluxe version of the simple charge rate limiter, using the same idea but with the ability to charge two packs simultaneously from a single wall charger. For circuit description and parts list, see the simple charger page. Since wall chargers....
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The circuitis a simple one transistor amplifier with amplification of about 30-40 dB (depends on transitor, temperature and voltage). The dynamic mic input is just a simple one transistor amplifier circuit with nothing special in it. LED D1 is inthe....
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The schematic diagram is quite straight forward. SW1 is a pushbutton used for starting the timer. The oputputs are set logic level 0 when the timer is not triggered, and to logic level 1 when the timer triggers. The relay driver transistor TR1, which....
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The circuit exploits the fact that when fed from a constant current source, the forward voltage of a silicon diode varies with temperature in a reasonably linear way. Diode Dl and resistor R2 form a potential divider fed from the constant current source. As....
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After we published the original Li`l 7 AM Transmitter plans, fellow experimenter Scott Todd sent us information about his design for a similar portable, battery-powered transmitter. -Original Message- From: Scott Todd Sent: Wednesday, April 12, 2000 8:58 AM....