Popular Circuits Page 165
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The liquid level controller circuit consists of the power supply circuit and level detection control circuit, and it is shown as the chart. Power supply circuit consists of the power switch S1, power transformer T, bridge rectifiers UR1, UR2 and filter....
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This transmitter sends an FM signal in the 88-to 108-MHz range, with a tone of 19 kHz. This can be used to activate the FM MPX pilot carrier indicator, which can be interfaced to external devices. L4 is for use with a 15 CM wire antenna. LI is 9 turns of....
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This is a quick DIY electronics project I set for myself so I could brush up on my circuit design and some building techniques. I bought a couple copper lanterns off ebay and fitted them with a circuit similar to the outdoor solar lights you can buy for your....
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Motorola SN54/74LS138 known to be 1-of-8 decoder or demultiplexer which is designed for high speed bar memory chip select address decoding. Below diagram illustrates logic diagram of this SN54/74LS138 demultiplexer. According to the SN54 datasheet, multiple....
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Manual buzzers used for quiz competitions in schools and colleges create a lot of confusion in identifying the first respondent. Although there are circuits using PCs and discrete ICs, they are either too expensive or limited to only a few number of players.....
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A 12V battery full charging circuit with simple diagram for rectifier is given.The lead acid trickle charger circuit is explained with a rectifier....
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The Neumann/Gefell UM 57 was a large-diaphragm tube condenser microphone manufactured by the Neumann company of Gefell, Germany, currently known as Microtech-Gefell. The mic used the Gefell company`s famous M7 capsule. This was a dual-diaphragm,....
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Most darkness activated alarms employ opamps and some logic ICs. Here, a less expensive approach is shown based on the eternal 555, this time in monostable multivibrator mode. Components R2 and C1 represent a one-second network. When the LDR (light dependent....
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The electronic dog repellent circuit diagram below is a high output ultrasonic transmitter which is primarily intended to act as a dog and cat repeller, w....
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The mechanical and electrical schematic in Figure 5 112 in FIG. Chant is a schematic diagram of the channel can be seen from the figure, the entire circuit is very simple. It consists of the following components: (1) electronic crossover section 6 ICl..
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E crystal oscillator circuit composed of several gates Several gates as shown by a crystal oscillator circuit. FIG. (A) to l MHz crystal oscillator circuit, the figure (b) is 2..
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I want to know if I can connect 2 dimmers in series to control more preciselly the light of a bulb. I want to get a medium/high precission of light emission, for a school project. I wonder if you can get a manufacturer to lend you a DC power supply in....
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This is a low cost, antenna-mounted, this UHF TV pre-amplifier circuit can add more than 25db of gain. The first stage of the pre-amplifier is biased from optimum gain. L1, L2 strip line equivalent with Lambda/8 of PC board. An RF power amplifier is a type....
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Amplifier device that accepts a varying input signal and produces an output signal that varies in the same way as the input but has larger amplitude. The input signal may be a current, a voltage, a mechanical motion, or any other signal; the output signal is....
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This article describes how to build a simple inductance meter. The PCB layout is included....
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This TDA2005 car audio amplifier circuit is specially designed to work on devices like : car radios, cd-players and similar devices. This car radio audio amplifier circuit is based on the TDA2005 audio IC which can provide a maximum output power of 20 watts....
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The circuit of the Celsius thermometer in the diagram is based on the well-known Type LM334 from National Semiconductor. This IC is a sensor that provides....
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The Glolab ED4GP microprocessor based Encoder / Decoder is designed for use with wireless modules, infrared remote controls and other devices that operate with serial input and output data. It can be used as either an encoder or a decoder by simply....
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Ul, an FET op amp needs a bipolar voltage atpins 4 and 7 with a common ground for optimum gain. You can calculate the gain by dividing R2 by Rl. Zero-set balance can be had through pins i and 5 through R3. Put a voltmeter between pin 6 and ground and....
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Almost any receiver covering 540 kHz to 1600 kHz is suitable for broadcast band DX`ing, and there are a lot of them. But the antenna is another matter. If you are new to the hobby, or if you have been having trouble DX`ing those really difficult stations,....
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The vu-meter is distinguished in two categories, those with the needle instruments and those with the led column. Whether it is a tube amplifier or integrated amplifier, a vu-meter sound level meter is required. Today there are enough chips that do this work....
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Rechargeable lithium-ion (Li-ion) batteries are everywhere these days, powering everything from laptops and tablets to cell phones, MP3 players, digital cameras, and all sorts of portable electronics. But what`s the best way to charge them This app note....
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Make it a habit to check the temperature gauge every 5-10 miles. The temperature gauge can tell you a lot about the car`s health. The needle moving from its usual position in traffic only slightly, for example, is an indicator of a failing thermostat. If you....
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AC negative feedback circuit is composed of R R and islands (Figure 1-30), since the C3 AC can be regarded as a short circuit, the actual results shown in Figure 1-32 o It is a..
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Using a Signetics NE602, this converter tunes the 9.5- to 9.8-MHz range. An AM car radio is used as a..
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This is yet another project born of necessity. It`s a simple circuit, but does exactly what it`s designed to do - dim LED lights or control the speed of 12V DC motors. The circuit uses PWM to regulate the effective or average current through the LED array,....
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An HD44780 Character LCD is a liquid crystal display (LCD) display device designed for interfacing with embedded systems. These screens come in a variety of configurations including 8x1, which is one row of eight characters, 16x2, and 20x4. The most commonly....
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This frequency doubler uses one CMOS quad, two input NAND gate package type 4011. The frequency doubler proper consists of an inverter IC1B, two differentiating networks R1/C1, R2/C2 and NAND gate IC1A, IC1C and IC1D function as input and output buffers. In....
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This program initializes all of the sixteen io lines of the U4x1 to be outputs. The lower four port pins of port A (A. 0 - A. 3) are "channel 1" when it concerns stepper activity, the upper four port pins of port A (A. 4 - A. 7) are "channel 2" when it....
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Astable or free-running multivibrators have been used in home-built amateur radio equipment for many years. The basic circuit is a two stage amplifier with AC-coupled feedback from output to input. One transistor stage is on ( conducting current ) while the....
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This is basically a flasher circuit modified to turn on and off a bulb instead of a LED. It uses a 555 timer IC working as an astable multivibrator. The flashing rate can be varied from very fast to a maximum of once in 1.5 sec by varying the preset VR1...
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This last article on bipolar junction transistors (BJT) is a potpourri of circuits. Some are practical and some are not so practical, but they can be great for experiments. With these circuits you can amplify signals, filter high and low frequencies,....
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The TDA7381 is a class AB audio power amplifier in Flexiwatt25 package designed for car radio applications. You you can also use this circuit for other purposes. Thanks to the fully complementary PNP/NPN output configuration the TDA7381 allows a rail to rail....
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This is a very interesting and simple circuit. This also can be used in quiz events, where two participants hit their button to answer. The participant, who pressed his button first, will get a chance to answer first. This circuit will resolve which....
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A multivibrator is a form of relaxation oscillator which comprises two stages that are coupled so that the input of one is derived from the output of the other. A multivibrator is basically two amplifier circuits arranged with regenerative feedback. One of....
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A simple digital mixer, based on two dual-Schmitt triggers (4583B) and three exclusive-OR gates, uses an RC time-delay circui..
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VUTRAX (pronounced View-Tracks) is the major professional Electronics schematic and PCB (Printed circuit board) design package in the UK. The product was the first EDA package offered for personal computers, having a pedigree back to 1981 when it was created....
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Here is a simple frequency counter designed to monitor the 240VAC mains supply. It as a frequency range of 0-999Hz, so it could also be used with 400Hz eq....
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The AN7147 Dual 5. 3-watt Audio Power Amplifier from Panasonic is listed as a replacement type` so hopefully will be around for some time to come. Together with some extra components, it can represent a simple surround-sound system requiring no opamps or a....
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Shaping block has the role to provide fixed length impulses (2 mS) at each breaker-points opening. In this way are eliminated the false impulses which appear due contacts vibrations. As shown in drawing, shaped impulse triggers directly the EID and act as....
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I have recently stumbled upon some LED strip at my local electronics shop and decided to give them a try. I bought some which I used to replace the spot lights in the kitchen. It is cold white, which is surprisingly good, especially for night time....
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As shown in Figure 555 constituting the DC capacitor tester. The tester from the pulse generator, single-shot, and the head indicating DC amplifier circuit. It measures NpF ~ 1..
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This little circuit will help you to remove all surplus small ac mains adaptors from your desktop. The circuit is nothing, but a smart dc power box direct....
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Hello. im going to make this mixer circuit.Im not sure if it work fine or not.Can you please check it for me ? Thank! In this schematic, i use R1=R2....
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Here is a simple yet very useful circuit which can be used to eavesdrop on a telephone conversation. The circuit can also be used as a wireless telephone amplifier.
One important feature of this circuit is that the circuit derives its power directly from....
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This circuit generates inaudible ultrasound to make a barrier across the entry. At the moment the circuit detects a break in the sound barrier, it generates a loud alarm indicating the entry of a person. This can be used to protects the entry passages and....
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The receiver is an audio amplifier fed by SPKR1, a piezo speaker that is used as a microphone. A scope or headphone..
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Crossing various sawtooth voltage generator, the common denominator is the use of a capacitor charge. Discharge effect to generate a sawtooth voltage of the forward and inverse..
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As a Nissan Panasonic rechargeable emergency fluorescent lamp circuit. Built-in 6V, 4A. h high-energy batteries can be directly charged. It allows the two 6W fluorescent lamps...
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This article is of interest only to readers whose bicycle lights are powered by a dynamo. The laws on bicycle lights in the United Kingdom are stricter tha...
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The following circuit shows about LME49810 IC For Power Amplifier Circuit Diagram. Features: better drive 4 ? impedance of the speakers, for the ....
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Hello everyone, I need help to modify this light dimmer circuit which is connected to PIC12C508 microcontroller. This circuit is designed for the....
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Cl, C2, and C3 are miniature ceramic or plastic trimmers- Tl (main winding) is 0.34 µ,. Use of 11 turns of no. 24 enameled wire on a T37-10 toroid core. The antenna winding has one turn, and Ql the source winding has three turns. T2 primary consists of 11....
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A novel supply voltage monitor which uses a LED to show the status of a power supply. This simple and slightly odd circuit can clearly show the level of the supply voltage (in a larger device): as long as the indicator has good 12 volts at its input, LED1....
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The ATMEL AVR programmer works with the Windows program ""Ponyprog"" which works under 95, 98, XP...
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The integrated chip LM386 is a low power audio frequency amplifier requiring a low level power supply (most often batteries). It comes in an 8-pin mini-DIP package. The IC is designed to deliver a voltage amplification of 20 without external add-on parts.....
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Constituted by a circuit block diagram MAX1463 precision pressure detection system as shown in FIG. Bridge pressure sensor output voltage connected to the MAX1463 IN1 +, IN1- e..
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This novel buzzer circuit uses a relay in series with a small audio transformer and speaker. When the switch is pressed, the relay will operate via the transformer primary and closed relay contact. As soon as the relay operates the normally closed contact....
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The following circuits are presented in a logical order (unlike the way they were designed) from initial power-up to the frills tacked onto the end of the project. A less organized and more stream of consciousness version of the Mark II design can be found....
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You have mentioned 89S51/52.But in the picture I see 89C51. Which one do I use for the given .hex file(without the need to change the .hex file)?2....
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When an input voltage is positive, the output of ICA is negative and diode D does not conduct; hence the outp..
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A new high-performance regenerative receiver is available as a kit. Using a new regenerative detector circuit allows a good performance regarding sensitivity....
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MLX90614 is a very useful infrared thermometer (no contact needed) that gives you the average temperature reading of all objects in the view range. In addition to it`s principal temperature reading function, it can be used for movement or even presence....
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Built around an LM380, this amplifier includes tone controls and electronic “soft switchingâ€. The soft switching circuitry ensures power is b....
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For this led driver electronic project you will need a DC power supply circuit that provide an output voltage between 2. 7V and 5. 5 volts ( supply voltage must be applied between Vin and GND. The T/F jumper connects the T post to the middle post of the....
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This is a TMP01 Temperature Sensor Transmitter circuit. This circuit is used in industrial environments to transmit the signal differentially on a wire pair....
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Intended as a replacement for generally poorly regulated "wall-type" ac/dc adapters, this circuit offers superior p..
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Thyristor zero trigger circuit output waveform is a sine wave, it will not produce as phase-shift trigger circuit as electromagnetic interference...
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An R/C electric motor that has a 10K thermistor sensor built into it, which is connected to a speed control that has basic thermal protection. I would like to build a secondary sensor board that displays the temperature on a segment display, but I still want....
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What is a servo? A servo is a small motor that you can position at any angle very accurately. It contains internal circuits that will automatically maintain....
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In order to start the timining you have 2 possibilities: you either connect the START point to ground GND and in this case the timer starts when you connect it to the voltage supply or you can place a switch to start it...
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This Lazy Old Geek is also an Arduino Geek. If you are an Arduino Geek, one of the common microcontrollers used by Arduinos is the Atmega328 chip. In order to use Arduino software, the Atmega must have bootloader software on it. I didn`t realize there was a....
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Figure 1-44 is dedicated BTL amplifier circuit, containing two single amplifier, and has integrated the relevant elements in the circuit, so the connection is very simple...
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As shown, this simple circuit using a LM311 in the level detector, and with a CMOS analog switches to release capacitance. A major feature of this counter is the number can be ..
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Build a digital multimeter that can measure dc/ac voltages up to 100V and dc/ac currents up to 1A. The circuit will be powered by 9v battery. I have decided to use the voltmeter from and modify it according to my needs. The problem is that after implementing....
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In contrast to an ordinary voltmeter, the input of an oscilloscope generally has one side (GND) connected to ground via the mains lead. In certain situations this can be very problematic. When the measuring probe is connected to a circuit that is also....
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Potentially, headphone listening can be technically superior since room reflections are eliminated and the intimate contact between transducer and ear mean that only tiny amounts of power are required. The small power requirement means that transducers can....
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This is a symmetrical amplification unit circuit, more composed, modified by a construction which was proposed some years ago by Lisley Hood. The most important reason is to get the right transistor FET at differential amplifier at input. In spite of all....
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This circuit is similar to the LED clock using 12 neon indicator lamps instead of LEDs. It operates from 2 high capacity ni-cad cells (2.5 volts) which keep it going for a couple weeks. High voltage (70 volts) for the neon lamps is obtained from a small....
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This is a new design of a tutorial board based on the popular PIC16F84A microcontroller. It features eight single leds, a 7-segment display, an LCD display and five push buttons. It is an ideal solution for the beginner to take his/her first programming....
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The core of this project (play a sound when a sensor is activated) is applicable to all sorts of areas (Halloween, art installations, scaring your little brother, Burning Man, etc. ), so read this with an eye to applications you`d like to see. My first....
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The circuit provides a windshield wiper delay, dynamic braking and windshield wipers when they reach the rest position. This prevents the blades passing, which could lead them to stop at a point where they interfere with the vision of drivers. With the....
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This simple electronics timing light uses RC circuit as a delay OFF timer to control an incandescent lamp by using a relay ..
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This audio processor circuit features the SSM2045 IC which was developed specially for electronic music applications and the 741 opamp IC. The circuit is c....