Popular Circuits Page 203
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Here`s a project that could be useful this summer on the beach, to stop anyone touching your things left on your beach towel while you`ve gone swimming; you might equally well use it at the office or workshop when you go back to work. In a very small space,....
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This stroboscope circuit uses 16 high-brightness white LEDs in a torch housing and it provides a signal output to a frequency counter to provide a rev counter display. IC1 is 555 astable multivibrator and it provides a signal to IC2, a 4046 phase lock loop.....
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This includes immunity to power line transients as well as those that may occur during power-on and power-off cycling. The parameters of many electronic components like ICs are rarely specified during periods of changing input power. Special laser diode....
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DTMF Touch Tone Decoder Using Microchip PIC Microprocessor This project contains the details of using a Microchip PIC12F683 8 bit microprocessor to detect....
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This be the circuit sets the time to model is simple,at can fix the time had long ago and have tall good accuracy. By use pillar equipment be IC CA3140 for....
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A company is given to ATMET 89C51 microcontroller core temperature intelligent monitor, monitor with automatic temperature recording a three-phase power before phase, a record ..
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Protect your Locker or Briefcase from theft using this pocket sized gadget. It gives a loud police siren to catch attention. The circuit uses a single IC a....
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A spider is a delay KD-9300 music IC, when you press the button switch SB, electric lamp E lights up, the delay about 20s, lamp E automatically turn off. VD, vs, C., (, And oth..
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A pattern generator is a very useful instrument for the correct alignment of the timing circuits of a television set. The circuit we propose you to build, is a «bar generator» that will produce horizontal and vertical stripes (bars) on the TV screen, that....
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These goals were achieved by using a discrete-components op-amp driving a BJT complementary common-emitter output stage into Class B operation. In this way, for small output currents, the output transistors are turned off, and the op-amp provides all of the....
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This article describes the proposed solution for a 200 W Power Supply using the FSFR2100 Fairchild Power Switch (FPS). The input voltage range is 90 265 VRMS and there are six outputs with...
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How to create a Battery pack for your Apple device that is powered by normal Alkaline batteries. This will be a general overview of building the circuit for the battery pack and the detailed instructions for the case will be given in part 2 of this post.....
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This device consists of a ring detector connected to the telephone line. When the telephone rings, the ring detector impresses high-frequency pulses on the ac power line...
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Usually we see Digital clock on LCD or 7 segmen. But, this AVR Digital Clock which is designed by Ficara Emilio displayed on Oscilloscope. The project use ATtiny 2313 as the main controller. What an interesting microcontroller project. Source code and....
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Blocking material monitoring circuit is shown. When the optical path is blocked by the material, the phototransistor VT1 off, off transistor VT2, VT3, VT4 shoot coupled flip-fl..
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This easy to construct Handy pen torch electronic circuit and low component count, uses two power white LEDs for lighting. Low volt (4. 8V dc) supply available from the built in rechargeable Ni-Cd battery pack is first converted into two channel....
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Any ideas Is this circuit going to be stand alone Any other circuitry around it, perhaps a microcontroller What circuitry does the timing device contain, or does it even contain electronics abdullah kahraman Mar 22 `13 at 18:10 Since you do not want much....
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Attached are 3 captures from my L297/L298 board using the same motor at 500, 750 and 900 steps/sec on a 36v supply, wired bipolar parallel (coil resistance = 3. 2ohm). This shows the A-enable signal (blue) and the sense voltage (red). The sense voltage is....
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The whistle switch allows you to turn on, or off, an appliance by whistling at it. I originally built the whistle switch in 1974. Do not attempt to duplicate it from the schematic below, but instead, understand the functions and duplicate these functions....
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One still designing that it uses in the exit transistor of technology V-mosfet. This transistors to us offer a lot of virtues concerning the simple bipolar transistors, as high speeds, thermic stability, low distortion etc....
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To put the relay in tension the 4 buttons S1 S4 must be pressed. If anyone of the 4 butoons S5 S8 are pushed the relay donts tension ( dont receives supply voltage ).
The supply voltage must be equal to the working voltage of the relay. One transistor....
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The Tesla coil described here can.generate 25,000 V. So, even though the output current is low, be very careful! The main component is a flyback transformer from a discarded TV. A new primary windin_g is needed. Begin by winding 5 turns of #18 wire on the....
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Control the state (on/off) and direction of two linear actuators that are really just DC motors. It seems easy but the problem is that the linear actuators are each 12VDC and consume 10 amps of current at full load. I bought a 25A external power supply....
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This is the circuit diagram of a simple UPS that can deliver 12V unregulated and 5V regulated DC. The transformer T1 steps down the mains voltage to 12V AC and then the bridge B1 rectifies it. The rectified signal is smoothed by the capacitor C1. When the....
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The bipolar junction transistor is still one of the cornerstone`s of modern solid-state electronics. Learn (or review) the basics of this important active device. The Bipolar Junction Transistor (BJT) triggered the revolution in modern solid-state....
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This panning circuit (short for panoramic control circuit) provides the ability to move the apparent position of one microphone"s input between two output channels. This effect is often required in recording studio mixing consoles..
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This is Infra-Red Remote Control Tester circuit. This circuit is used to test go/no-go of any remote control transmitting infra-red (IR) light. The supply of this circuit is 3V battery. This circuit has some advantages, such as fits in a compact enclosure,....
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Many fire alarm circuit is published in different website. But, here in this website is a simple and inexpensive project of fire alarm using thermistor. where thermistor is used astemperaturesensor of fire alarm. Working principle of thermistor is same as....
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The Allegro ® A8732 is a Xenon photoflash charger IC designed to meet the needs of ultra low power, small form factor cameras, particularly camera phones. By using primary-side voltage sensing, the need for a secondary-side resistive voltage divider is....
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Using this circuit will give Good Charging results to a Sealed Lead Acid Battery, like I use in the Metal Detector. This Circuit is Extremely Small in size and has a low parts count, making it ideal in some situations. It can also be adapted for Charging....
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This circuit is a wireless car alarm system that is built using two circuit modules, namely modules of transmitter and receiver modules. This circuit works on FM radio waves. Car alarms can be used on vehicles that have a 6-12VDC power supply. You can use....
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This circuit switch slowly on and off the internal lights in a car. The delaying time can be adjusted changing the values of the 10k, 4M7 resistors and capacitor. Source: NEXT. GR..
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Build-in charger for instruments powered by single lithium-ion or Li-Pol accumulator. If external power supply not conected to charger, current back from the accu charger is very small. New version improved temperature stability and Not Needed NTC....
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We introduce an inverter today mainly by the MOS field effect tube, the ordinary power transformer forms. Its output power depends on the power of MOS field effect tube and power transformer, avoid the convoluted voltage transformer to wind, suit electronic....
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This circuit has been very useful in filling a header tank for a reticulated water supply on a farm. Eight troughs are supplied in different paddocks where a lack of water would have serious consequences for the stock. In the past, the tank had been filled....
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A minimum number of parts yields a compact switching converter that can provide sufficient voltage to drive white LEDs. The resulting lamp is much more efficient, in terms of lumen hours per pound of battery, than incandescent bulbs, and because the color of....
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As shown in FIG receiver may help patients avoid missing voice in the daytime, only the receiver itself is working, lights will automatically cut off part. At night the lightin..
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The 2N5457 JFET and PN2222 bipolar have inherently high output impedance. Using Rl as a current sensing resistor to provide feedback to the LM101 op amp provides a large amount of loop gain for negative feedback to enhance the true current sink nature of....
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This circuit can control a small DC motor, like the one in a tape recorder. When both the points A & B are "HIGH" Q1 and Q2 are in saturation. Hence the bases of Q3 to Q6 are grounded. Hence Q3,Q5 are OFF and Q4,Q6 are ON . The voltages at both the motor....
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All the naturally occurring phenomena like sound, temperature and pressure etc, are analog in nature. Therefore to make an micro-controller read analog signal for analog-to-digital conversion process, through built-in analog-to-digital converter (ADC), it is....
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This circuit uses LEDs to display logic states for high, low, rising pulse, and falling pulse, it is generally useful for debugging logic circuitry...
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My beacon is using now a simple CW keying QRSS3 10140. 020 khz, power is 20 milliwatt. I`m using a PIC program PicBeacon di Ik2pcb. Click here for the reception report The idea of making this beacon start from two project, one is the Hans G0GPL QRSS Junkbox....
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This bug can be attached to anything from a glider to a pot plant and you can track it with a radio.
Why track a pot plant?
The Beeper is the result of many requests for a mini tracking device and introduces a new world of tracking.
The circuit is very....
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With the phasing out of game, serial and parallel ports from modern computers and the ever increasing popularity of USB, it makes sense that hobbyists start getting to grips working with USB. Unfortunately, USB is not a simple protocol and can be daunting to....
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Analog electronic clock the whole point of the trigger signal to obtain ..
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For other input structures see Figures 6 to 11; shown here with PC-filter (Figure ß). The micropoco capacitor has a temperature coefficient of 125.10"6i 60.10" k"1. In simplified circuits a fixed resistor (e.g. 620k) can be used for a guaranteed switching....
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Using this wireless IR Headphones circuit electronic project you can transmit audio signal using an infrared connection .This wireless IR Headphones circuit diagram electronic project is composed by two parts : transmitter and receiver . This is not an RF....
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A multimeter can be used to test the health of a triac. First put the multimeter selector switch in a high resistance mode (say 100K), then connect the positive lead of multimeter to the MT1 terminal of triac and negative lead to the MT2 terminal of triac....
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This is a status panel driver circuit. This circuit is used to turn on lamps or LEDs in a graphic panel that represent faults, action, and status of an....
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This circuit is for a QRP (low power) antenna tuner, a.k.a. a transmatch, for use in the short wave amateur radio bands from 3-30 Mhz. It allows a wide variety of antennas to be connected to a low power transmitter. When the circuit is properly tuned, the....
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This is a circuit for antenna UHF TV that can be give 15dB preamp. This circuit is built by transistor and low components. This is the figure of the circuit. The circuit above is formed based on BF180 UHF Transistor. The first stage is a band pass filter....
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The SI4704 SI4705 enhanced FM receiver is the most advanced portable solution available today offering embedded Antenna support, digital Audio out, worldwide FM band support, and highly flexible, mature, and proven FM functionality in a simple API. The....
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The amplifier operates across the 2 -30 MHz band with relatively flat gaio response and reaches gain saturation at approximately 210 W of output power. Both input and output transformers are 4:1 turns ratio (16:1 impedance ratio) to achieve low input....
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An innovative current detection method, eliminating the power loss of the sense resistor in series with the motor, a 4-digit - analog converter (DAC), provides a digital contro..
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I want the final package to be as invisible as possible, and without any wires / adapters / etc. Obviously that requires me to run this project from a small battery. To preserve power, I`m thinking about putting the ATMega (eventually probably the ATTiny)....
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VisISP-52 is a Windows application that will run on all modern versions of Windows (Win95, Win98, Win2000, WinME, and WinXP) and which will allow supported microcontrollers to be programmed "in-system". It was developed specifically to program the Atmel....
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A simple touch switch circuit using CD4011 is given here. The IC CD4011 is wires as a flip flop here. The 9, 13 pins of the IC works as the set and reset contacts respectively. CMOS ICs like 4011 require requires a very low current for controlling its gates.....
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Shows 8 digital tube display driver circuit, driven by the two ICM7211A, BCD / = binary data signal is sent to the BO-B3 ICM7211A end, select the digital signal divided into two groups were sent sentenced Dl ~ D4 end...
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If you are a newbie and having the similar experience, here I suggest a general purpose I/O board that will not only reduce your prototyping time but also free up plenty of space on the breadboard for your project. The construction of this board is very....
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Part of this circuit is turning the analog signal coming from the reversed LED (sensing mode) and amplified by the op amp into a digital (on/off) signal. I got rid of all that. This is the modified simplified version of the schematics: Another possibility is....
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As shown in the circuit in order to stabilize the lamp brightness L, using thyristor AC automatic voltage regulator circuit. Access to this end a diagonal line from the thyrist..
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This detector is useful in sine wave squaring circuits and A/D converters. The positive input may either be grounded or con-output nected a nulling voltage which cancels input offsets and enables accuracy to within microvolts of ground..
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Attached to the wall is a high-rise building construction elevator indispensable vertical transportation machinery. Its drive motor usually wound wire induction motor. Using th..
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As shown in FIG Hitachi np8c switching power supply circuit, Hitachi NP8C power models are: Hitachi CTP236, CEP320D, CRP350D, 450D, Furi HFC-236,450, Venus C37-401, C46-1, C563..
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This project based on Atmel AT89C52 and Dallas real-timeclock (RTC) chip DS12887 can be used to control and remotely program the switching operation of 24 electrically operated devices. The devices can be switched on/off at precise times repeatedly every....
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Binary Coded Decimal is a number system that only counts from 0 to 9 and then repeats. The table below shows the conversion between the different numbering systems and BCD code. BCD is also called 8421 because the binary LSB counts as a 1, the next bit adds....
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The tool is based on a NE555 (or LM555) timer i.c., wired as an astable multivibrator. The frequency of the multivibrator is determined by the value of the unknown capacitor Cx. The circuit can be fed by a small battery. I use myself a 9 V block battery....
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The easiest solution would be to take a cheap wireless toy car take out its receiver module along with its remote and use them in your robot. The other way round is this to make your own RF remote We will be using ASK (Amplitude Shift Keying) based Tx/Rx....
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CD4017B input signal is applied where CP triggering end, I lost A ~ 3HCD4017B pulse signal is liter inline J. IC Icl a straight-through output signal hill, iq is through Nortel..
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The schematic diagram come from circuit: The Voltage Regulator With a Field Effect Transistor power supply. Go to that page to read the explanation about above power supply related circuit diagram. Feature of this transistor compensation voltage (see....
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miRover. This pages details how to use a PIC microcontroller and an H-bridge or a L298 to drive a Bipolar stepper motor..
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Here is a `beeper` circuit employing two 555 ICs. It can be used in various circuits (having supply voltage of 5 to-15V DC) that require an alarm or a `beeping` signal. IC1 is connected in astable mode in the circuit in such a way that squarewave output at....
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The LM1812 is a complete ultrasonic transceiver on a chip designed for use in a variety of pulse-echo ranging applications. The chip operates by transmitting a burst of oscillations with a transducer, then using the same transducer to listen for a return....
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Reverse engineered circuit diagram of an expensive commercial variable lab power supply. This unit is designed around an ordinary op-amp and easy to obtain parts. Although the unit uses a single transformer with two output windings the circuit works equally....
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The basic VFC (voltage-to-frequency converter) in Figure 1 comprises an integrator (IC1) and a Schmitt-trigger circuit (IC2). The integrator converts the dc input voltage, VIN, to a linear voltage ramp, and the Schmitt trigger sets the limits of the....
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This circuit controls the switching of the street light or porch light and it will be automated. This circuit of automatic lamp controller using 7806 regulator IC can be used to automate street lights, tube lights or any other house electrical lightning....
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Here`s the new flasher circuit schematic. It consists of a 555 timer circuit and a power transistor. The power transistor is probably way overkill, (it is rated at 10A) but it`s what I had available. You can vary C1, R1 and R2 for to vary the flash rate and....
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AMIS-49200-XTP is a sub package of AMIS-492X0, If you need see the description, please click AMIS-492X0. If you need AMIS-49200-XTP`s datasheet, please download it from below. By ON Semiconductor ..
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Most homes today have at least a few infrared remote controls, whether they be for the television, the video recorder, the stereo, etc. Despite that fact, who among us has not cursed the light that remained lit after we just sat down in a comfortable chair....
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The wiring schematic played a big roll on the robot. This diagram is used to graphically display all the wiring of the motor controlling micro-components that gave the robot the ability to physically move forward, backward, left, right, and stop. (This....
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8 shows a typical D/A conversion circuit, which uses DAC0830/DAC0832 chip, the microprocessor will output 8 -bit digital signal into an analog signal. ..
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A front-end circuit has been developed for the D0 upgrade for reading out visible light photon counters (VLPC`s) associated with the fiber tracker and the preshower detectors. This custom chip, called SIFT, will be used to collect low-level charge signals....
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A 2m ham radio transceiver that includes all the necessary circuitry, in particular the voltage-controlled oscillator ( VCO ) + phase-locked loop ( PLL ) for frequency synthesis, low noise amplifier ( LNA ) for the receiver front-end, power amplifer (PA) for....
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Here is the schematic of a water level alarm circuit. The circuit will work as a water level sensor and will give a melodious alarm sound when the two probes in the circuit will detect water. You can use this water level indicator circuit to detect the level....
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As shown in the Colpitts oscillator based on the deformed oscillator basis is formed by an oscillator Clapp, Colpitts oscillator with the fundamental differences between the re..
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Circuit shown in Figure 3-104. in graph. SB2 is running at low speed button, SBi as the high-speed operation button. ..
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This dc-to-ac inverter is based on the popular 555. A 555 oscillator circuit drives a buffer amplifier consisting of Ql, Q2, and Q3. The circuit operates at 150 to 160 Hz. Tl can be a 6.3-V or 12.6-V filament transformer as applicable...