Popular Circuits Page 56
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This project is a digital Automatic Gain Control (AGC”) system using a PIC16F876 MCU. The ability to set the gain level in a circuit and have it control itself is a very useful function. This circuit is a building block of another project I am working on. A....
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The following circuit shows about DTMF Remote Domestic System Control Circuit Diagram. Features: DTMF signals can be transmitted over a radio to ....
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Audio-taper pot, R1, adjusts input level into two LM386 amplifier chips. The LM386 is a low-voltage audio power amplifier, designed to operate on 4V to 12V. It has an internal 15K feedback resistor between pins 1 and 5 which would set the gain at 20 (26dB)...
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This is one of my favorites. The LM386 is a low voltage audio power amplifier. It can provide 125mW to 750mW, enough for any project that uses audio. This circuit can work with batteries, requieres minimum external parts and works from 4 to 18 Volts (contact....
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The LTC®1440 series comparators are true micropower
devices. They eliminate current peaking during switching,
resulting in greatly reduced power consumption versus
frequency, or when the inputs are nearly balanced. Figure
2s plot contrasts the LTC1440s....
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The resistance of loudspeakers is characterized in a frequency depending on the destination and their press. Loudspeakers are distinguished, as for the destination, in loudspeakers of low frequencies, woofer intermediate, mid-range and high tweeter. Their....
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It is important yet to mention that the 74HC240 can drive directly an IRF510 FET transistor being able to give until 10W. Another application is using it to drive a balanced diode mixer, which needs a considerable power drive, easily supplied by a 74HC240....
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This project uses just one tube. However, the tube chosen (13EM7) actually contains two separate triode structures. One is physically quite small, and is capable of a large signal gain but little power. It therefore makes an ideal preamplifier stage. The....
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To reach low channel ON resistance (<30 Ohm) and low OFF current leakage, 4-channel commutator uses the 2N4091. The DM7800 voltage translator is a monolithic device. This device give us 10V to -20V gate drive to the JFETs while at the same time giving....
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This is a simple circuit diagram of 5-LED audio VU meter using IC KA2284/KA2285. The KA2284, KA2285 are monolithic integrated circuit. It is a logarithmic display driver IC. And it is Bar type display driver using 5-Dot LED. The KA2284/KA2285 has a wide....
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An electrocardiogram or ECG (also known as EKG ” abbreviated from the German word Elektro-Kardiographie), is an electrical recording of the heart and is used in the investigation of heart disease. This application makes use of a DrDAQ Data Logger to read and....
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A homebrew 2M transceiver I wanted to use it mobile so I wouldn`t have been able to use a fist mike. I had the bright idea of using one of those cheap personal hands free kits you can buy for mobile phones, however once installed reality struck home - hardly....
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The TC4422 chip is in place of the BD140/BD139 totem pole. Unfortunately I do not have a multisim model for this chip so I can add it to the circuit....
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Note that Tl and T2 are TOKO, including part numbers for the coils Tl and T2. The direct-con-version receiver shown uses a double-tuned input network made from readily available TOKO coils. IC1, an NE602, acts as a VFO and mixer, with the output being an IF....
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It will be effective to use simple half wave motor speed control with small universal? ac/dc motors. Two amps RMS is the maximum current capability. The...
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Using a flywheel-driven permanent magnet DC generator to charge up a bank of supercapacitors, 35 farad rated to 25V. For safety I limit the max charge to 22V via a comparator and a zener reference. Because I have no stable reference voltage at all in in this....
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After the unexpectedly big success of my JFET bass preamp I decided to build an onboard version. For a Jazz Bass-like instrument, I had to get along with three controls, maybe some switches if I used push-pull pots. Further, I wanted the functions of the....
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You won`t be disappointed with the performance of this sensitive ultrasonic receiver. It can let you listen to bugs, bats, engines, and virtually any other source of ultrasonic sounds. This circuit uses a piezo tweeter as an ultrasonic microphone, amplifier....
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A blog about new developments in 3D printing, RepRap and Open Hardware A blog about new developments in 3D printing, RepRap and Open Hardware...
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A voltage comparator is a device that compares the voltage at the two inputs and develops an output based on the inputs. A high output when the plus input is greater than the minus input or a low output when the plus input is less than the minus input. A....
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This is a very simple cable TV amplifier using two transistors. This amplifier circuit is most suitable for cable TV systems using 75 Ohm coaxial cables and works fine up to 150MHz. Transistor T1 performs the job of amplification. Up to 20dB gain can be....
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The area that I live in has been in a drought for a year or more. As such we now have water restrictions on washing the car, watering the garden etc....
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Some 20 years ago it was common to see small key-holders emitting an intermittent beep for a couple of seconds after its owner whistled. These devices contained a special purpose IC and therefore were not suited to home construction. The present circuit is....
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Capacitor Cl is charged to +28 V through Rl and stores energy for firing the squib. A positive pulse of 1 mA applied to the gate of SCR1 will cause it to conduct, discharging Cl into the squib load XI. With the load in the cathode circuit, the cathode rises....
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The device uses a microammeter with full scale deflection of 50 uA and with the resistance of 2 kilohms. The upper limit of the measuring range of the voltmeter is 1 V, and in the range of 0. 2. 1 V the measurement error due to the nonlinearity of the scale....
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This TV transmitter transmits audio and video signal from Camcoder Camera, DVD, VHS, Satellite, video game, etc. Playing them in a channel free from the strip of VHF. These signal can be radiated with a common antenna and captured in an it distances of until....
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This MOT`s LSI is very suitable for designing ham rigs` VFO, which has 4 digit BCD preset counters from 3 to 3999. And also there is standard Xtal frequency oscillator and preset dividers. This LSI`s input nodes are pull down in the LSI. You should supply 5V....
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This circuit has been designed to provide a clearly visible light, formed by 13 high efficiency flashing LEDs arranged in a pseudo-rotating order. Due to low voltage, low drain battery operation and small size, the device is suitable for mounting on bicycles....
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This circuit can be used to operate an electric strike or an electromagnetic lock on a door. It is not the door being opened/closed, but a small electromagnetic strike which unlocks the door. The opener has the following features currently programmed in....
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A very good 1 watt fm transmitter circuit, very easy to build circuit. It has 4 transistors, one is a very stable oscillator, followed by a buffer stage to prevent frequency variation when you adjust the transmitter. Next is a resonance stage and the final....
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The circuit in Figure 1 provides a simple and inexpensive way to protect one of the most valuable components in portable applications: the battery. Applications include all portable equipment that requires a limited time of operation, such as test....
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The laser light detector utilizes a sensitive photo transistor (Q5) placed at the focal point of a lens (LE2). The output of Q5 is fed to a sensitive amplifier consisting of array (Al) and is biased via the voltage divider consisting of R14 and Rl. The base....
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AC to DC circuit is a sinusoidal alternating current into direct current crossing the circuit, if the input signal is not sinusoidal but triangular wave or sine..
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One problem this causes is that the lovely USB port that I have been using to communicate with hyperterminal will no longer be available. So I need an alternative. This lead me to the FT232RL chip. I picked this mainly because it is already in Eagle and....
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This display driver circuit shows how a Seven Segment Display is driving with the help of the 5 stage Johnson decade counter IC CD4033.The IC has counter a....
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The metal detector circuit is composed of the power circuit, sine wave oscillator, PLL phase-locked loop circuit and hybrid amplifying circuit, and the circuit is shown as the chart. Power circuit is composed of the batteries GBI, GB2, filter capacitors C1,....
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A simple logic-analyzer design is compatible with all versions of Windows and pushes the PIC 18C252 chip to its speed limit to achieve a 1-MHz sampling rate (Figure 1). The circuit can examine three channels of relatively low-speed logic signals that have....
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Most small internal-combustion engines commonly used in the model-building world use glow plugs for starting. Unfortunately, glow plugs have an operating voltage of 1. 5 V, while fuel pumps, starter motors, chargers and the like generally run on 12 V. This....
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The plumbing is done and the fuel system is done. Final checks on the electrical system are under way. More tidying up and testing of the bike loom. Nearly there. I`ve got onequery though. My 2003 loom has two unused connectors for an alarm system. To me,....
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For the absolute measurement of temperatures, a thermometer is indispensable. However, in many situations, an ..
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Surround Sound Decoder circuit diagram. The circuit`s operation starts as the stereo sound signal transports surround sound information on the master volume part of the circuit. This will drive the Left channel Lch attached to Model TL072 IC1A and IC1b in....
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This is a design circuit for measure inductance of the inductor labeled LX which is the inductance to be measured. The o/p of the circuit is a TTL square wave whose frequency relates to the inductance being measured. The inductance meter adapter output is....
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Description:The following circuit shows about Basic Monostable Multivibrator. This circuit based on the 555 Timer IC. Features: Pin 4 is the RESET, t=R1xC1, ....
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The history of a pioneering tube that was developed by Philips Research and that was, next to the magnetron, The most important tube from World War II The radio valve factory of Philips in Eindhoven was the scene of unusual tension and activity in the....
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Wireless stepper motor speed control project using laser and IC555. Read to know about basics and circuit construction using a wireless stepper motor which has speed control through laser and IC 555 ..
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MIDI, or Musical Instrument Digital Interface, is a specification for a communications protocol between digital synthesizers and other digital music devices. It was developed to be as simple and general as possible, to give synthesizer manufacturers as much....
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Here's a way to get a short range bidirectional RF (Radio Frequency) channel on a microcontroller, using the controller's tristatable I/O pins and on-chip comparator with a few passive components. The range with the firmware and simple I came up with for....
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The principle of operation is counting the pulse number derived from a constant frequency oscillator during a fixed time interval produced by another lower frequency oscillator. This oscillator uses the capacitor being measured as the timing. The capacitance....
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The following circuit diagram is the battery charger for your 12V car battery. Unlike other battery chargers, this circuit featured overcharging protection which automatically disconnect the charging circuit. Most car battery chargers are simple devices that....
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This circuit shows about 4017 IC For Flip-Flop Timer Circuit DIagram. Features: Push-button S1 will discharge capacitor C1 through R2. Component: ....
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In this circuit, using a photoelectric coupler can reach 100G? isolation between TTL and relay circuit, it avoids relay noise and peak voltage influencing TTL circuit. When the TTL input singal is high, Q1 turns on, there is no current in LED, and there is....
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Environmental noise monitor circuit is shown. It mainly consists of high gain mu Specification for Zinc composition. Measured noise signal is indicated by the ammeter. ICl oper..
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Main matched LG26 one inch of screens of FSP107-2PS01 two-in-one electrical power package, direct drive CCFL modulator tube, its material object is shown as in Fig. 1. If cooperate with other producers For instance Samsung, AU, etc. Screen at, it is only at....
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A two transistor electronic siren breadboard circuit that produces an audible rising pitch on a loudspeaker. Tutorial and circuit for beginners in electronics....
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The IC8211 presents the voltage reference and regulator amplifier, although Q1 will probably be the series pass transistor. R1 defines the output current of the IC8211, although C1 and C2 present loop stability and as well act to suppress feedthrough of....
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This amplifier circuit is used to amplify TV signals in UHF range. It uses a low-noise transistor and gives 10 to 15 dB amplification in the frequency range from 400 MHz to 850 MHz. The transistor must be shielded from the input components and in....
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Used Zener Diodes to derive the stabilized voltage for the Hartley oscillator (although I did find a couple of suitable voltage stabiliser valves (CV287) whilst sorting through a box of valves this morning). Whilst sniffing around in that box of valves....
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SMPS design and analysis requires an understanding of many different areas of study. This article is intended to help the reader become familiar with the several different SMPS topologies, and their general performance characteristics. The major information....
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This Chip from TI is simple to accommodate into your designs and this band-aid is acceptable for assembly of lighting gadgets, actuality a constant affection and anticipated achievement is calmly obtained. The absolute ambit consists of the ascendancy IC,....
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The circuit described here is of an economical smooth variable power supply which offers 0V to 24V. It provides all controls and short circuit protection with acceptable regulation and a ripple free supply and yet uses very few components. The circuit....
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As shown, the circuit uses the Zener diode D1 limits the surge voltage, use four diode rectifier bridge to prevent reverse voltage. Zener diode D1 is 36V, optional 1N4753A or P..
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There`s not much to this circuit. The two RJ-11 jacks are set up to feed the telephone circuit through from the wall to the phone. The active signal for a single phone is on the red and green wires. Yellow and black are usually used for a second phone line.....
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We can use this circuit diagram to adjust the speed of a low-power induction motor, such as those which can be found in fan application. The function of...
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This Home Alarm System is simple, secure, fast and cheap. It`s only few components with maximum security with Rolling Code TX and Shock Sensor with variable sensitivity. The alarm module can be assembled in only 2 hours and it don`t need manual preset. Home....
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This motor speed controller uses a single IC LM1014 to control the speed of a DC motor. It senses the increase in the motor-current when the rotation of th....
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This circuit uses two quad op-amps to form an eight LED audio level meter. The op-amp used in this particular circuit is the LM324. It is a popular IC and should be available from many parts stores. The 1K resistors in the circuit are essential so that the....
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A very high quality intercom, which may also be used for room monitoring....
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A function generator is a signal source that has the capability of producing different types of waveforms as its output signal. The most common output waveforms are sine-waves, triangular waves, square waves, and sawtooth waves. The frequencies of such....
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The following circuit shows about Simple Light Sensor Circuit Diagram. Features: Crocodile Technology for simulate circuits working, LDR is high ....
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The circuit was designed to work with an audio power amplifier which operated off 18v-0v-18v power rails. The actual voltage used is not too critical except that the feedback is referred to the LED chain which itself is anchored to a 12v rail, hence the....
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A Battery-status Indicator circuit can be useful, mainly to monitor portable Test-gear instruments and similar devices. LED D1 flashes to attire the user`s attention, signaling that the circuit is running, so it will not be left on by mistake. The circuit....
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The Proximity Camera Head (A2047) is a Long-Wire Data Acquisition ( LWDAQ ) Device that reads out a TC255P image sensor. It is a radiation-tolerant descendent of the Inplane Sensor Head ( A2036 ). We use the A2036 and A2033 most often with the LWDAQ....
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The circuit diagram of this programmable sequencer could be applied in a number of timing uses. Prior to the start of each interval, an audible tone is generated, and a seven-segment LED display shows the interval number. Prior to the end of that inerval,....
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This project is used to communicate or transmit a text message from one place to another place through wireless. The text message is encrypted by using the Microcontroller and the encrypted message was transmitted through wireless. At the receiver end the....
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This mini-VOX voice operated relay is based on a circuit published in Silicon Chip, 9/1994, p31. The off delay time may be adjusted by varying R3 and R4. Reducing R3 will result in a longer release time. You could change the release time constant (C2 & R5)....
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The inverter is suitable for battery powering of mains appliances. It is a switching converter, which contains no bulky, heavy and expensive iron transformer. The advantage of small size and weight, precise output voltage stabilization and among other....
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This circuit produces a sound similar to the police siren. It makes use of two 555 timer ICs used as astable multivibrators. The frequency is controlled by the pin 5 of the IC. The first IC (left) is wired to work around 1Hz. The 47uF capacitor is charged....
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This project has not been called a GOLD! detector as this name has been left for the more complex detectors that actually discriminate been gold and other metals. There is an enormous difference between detecting gold and ordinary metals (called base....
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This mains AC Relay module uses a 5V relays that can run straight off the Arduino and switch 230V, following the circuit on the arduino website here: relays. pdf I`ve built my own (very simple) evergy monitoring and control system (using Arduino 2009), using....
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Switch-mode power supplies are used in electronic circuits to increase (step up) or reduce (step down) voltage levels in the most efficient manner possible. Compared to linear voltage regulators, switch-mode supplies convert relatively little energy into....
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Manufacturers of cordless drills generally recommend a battery charging time of three hours. Once the charging time is up the battery must be disconnected from the charger: if you forget to do this there is a danger of overcharging the battery. This circuit,....
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The following segment will provide the enhanced Motorola schematic for any typical application for the MRF141G (which includes parasitic stabilization features), a broadband power RF MOSFET which will place out a conservatively-rated 300 watts across the FM....
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Hope someone can help me. I want to build a square generator. I want it to have control for frequency variable 1hz to 200hz, a switchable voltage....
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Composed of discrete components, also known as FM front end circuit FM receiver circuit, since components and more difficult to debug, easy miniaturization and other shortcomin..
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This is a very basic infrared detector/emitter circuit. One major downside of this circuit, is that ambient infrared light will interfere with its detecting obstacles...
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The detector will sense static charges and free ions in the air. It can be used to indicate the presence of ion emission, high voltage, static electricity, and electrostatic fields. The ground can be an earth ground or a touching metal by your hand...
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For the outband decoder shown here to work, the cable company must provide at least a 1 millivolt signal. Values for C1-C5 and L1-L4 ore found In Table 1. This circuit consists of an amplifier for the synch channel and a video detector which controls an....
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The excitation device for light duty synchronous motor 625kW initiated. Triggering the device circuit consists of three ..