Popular Circuits Page 182
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This circuit generates a square-wave which is useful as a clock signal or AC drive for the excitation of sensors. this article presents a square-wave...
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C2 can be chosen for the degree of smoothness as its value is effectively multiplied by the combined gains of Q1/Q2, if 100 µF is chosen for C2, assuming minimum hef for Q1 and Q2,..
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This diagram comes from the Progressive Communications Receiver that is in most of the latest ARRL Handbooks. This amplifier is used anywhere an IF amplifier is needed. W6BKY has a receiver article at Hamradio-online that shows how to build this circuit on a....
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The TDA9813T is an integrated circuit for vision IF signal processing and sound dual FM demodulation, with single reference QSS-IF in TV and VCR sets. For negative modulation standards only. ..
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Trying to estimate the pump input energy your circuit needs, let say your average voltage input (waveform D) is around 6V (12Vpp) and let say your average input current (waveform G) is around 1. 5 - 2mA (8mApp) so to maintain the loaded oscillations in L1-L2....
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The headlight flasher is nothing more than a 555 oscillator/timer that`s configured as an astable multivibrator (oscillator). Its input is used to drive the gate of an IRF53IND hexFET, which, in turn, acts like an on/off switch, ..
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Electronic applications such as distortion and communications measurements require pure (distortionless) sine waves as input test signals. Distortion contained in test signals causes two problems. First, the test signal distortion content must be calibrated....
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Use a voltage to frequency conversion chip along with an analog temperature sensor such as LM335 or a thermistor, and then transmit the modulated frequency signal via an RF data link module. Alternatively, we can use a digital temperature sensor and sending....
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The following circuit shows about Electromagnetic Field Sensor Circuit Diagram. This circuit based on the uA741 IC. Features: used to sense ....
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Seems to me it uses at least as much power and at least as many components as a 4 channel balanced amp. it may well sound realy good and its quite clever, but does seem like a lot of trouble to go to `to travel the path less travelled` all the sameit really....
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This AC motor speed controller can handle most universal type (brushed) AC motors and other loads up to about 250W. It works in much the same was a light dimmer circuit; by chopping part of the AC waveform off to effectively control voltage. Because of this....
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The circuit was designed for the purpose of creating a voltmeter with high impedance that would measure Direct Current voltages across any types of circui...
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The SSM22111 is a high performance audio amplifier that delivers 1 W rms of low distortion audio power into a bridge-connected 8 © speaker load (or 1. 5 W rms into a 4 © load). The SSM2211 operates over a wide temperature range and is specified for single-....
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National Semiconductor has been producing and designing ICs for use in switch-mode power supplies for many years. The application of these devices is norm....
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This is a general purpose remote control project with using programmable PIC microcontrollers (PIC16F628, PIC16F630, PIC16F684). Schematics are shown for using infrared (IR) or radio (RF) media. If you are not familiar with microcontroller programming, you....
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A simple light to frequency converter circuit with diagram and schematic.Used as Light intensity measurement circuit.Design using TLC555, a cmos version of NE 555 timer IC....
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The AAT1265 evaluation board provides a platform for the testing and evaluation of the AAT1265 low voltage 2MHz Step-up Regulator The evaluation board demonstrates suggested size and placement of external components to main- tain output voltage regulation....
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You need free power? This schematic transforms the surrounding radio waves to usable current. The levels of power can be stepped up by using more diodes. The critical points in this device are first the type of diodes and second the antenna construction. The....
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The L293 is designed to provide bidirectional drive currents of up to 1 A at voltages from 4. 5 V to 36 V. The L293D is designed to provide bidirectional drive currents of up to 600-mA at voltages from 4. 5 V to 36 V. Each output is a complete totem-pole....
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Solar Cell Charger Schematic. The circuit was built with a single oscillator system (blocking oscillator)....
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1500W power amplifier circuit design diagram by Rod Elliott. The circuit is built using 10 pairs of power transistor MJ15024 and MJ15025 (or MJ21193/MJ21194)..
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Inverter of what this text produces see Fig. 1 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,....
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Acoustic thermometry is used where extremes in operating temperature are encountered, such as in cryogenics and nuclear reactors. The transducer is composed of Polaroid ultrasonic material, mounted at one end of a sealed, 6-in long Invar tube. The medium....
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Here is a simple technique for measuring frequencies over quite a wide frequency range and with acceptable accuracy limits using a PC. It follows the basic technique of measuring low frequencies, i.e. at low frequency, period is measured for a complete wave....
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A single chip metal detecor with a range of a few inches. This is useful for decting nails or screws in walls and floors, or for locating buried mains cable...
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The cooling is not only a PC using a small fan with an electronic commutator [1]. A special feature of these fans is that their removal is less dependent on the load. Indicators monitoring the DC component of current may therefore be very reliable.....
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Carbon arc beam was used extensively as searchlight during WWII. Fig. 1 shows a basic configuration. Basic beam generator can be modified as shown in Fig. 2 so that high-voltage (HV) electricity rides the beam. This design has never been tested. ..
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The Quad Laser Head ( A2050 ) is a LWDAQ device that drives four laser diodes. The A2050 was designed by Brandeis University for general use with BCAMs. The Weizmann Institute took the A2050 schematic and created their own version of the A2050 for use with....
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The telephone repeater or The call signal peripheral circuit to the loud than the original. It`s a circuit that we design follow the request. One of my friends ..
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This circuit is a circuit diagram of a remote control using DTMF. Actuality we achieve the use of DTMF (dual tone multi-frequency) signals (used the phone to punch in numbers) as the influence of the code. DTMF tones used for the abundance accentuation of....
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This is a fan controller for an audio/video cabinet. It uses a PICAXE 08M and a DS18B20 temperature sensor. The fan is turned on at 30 degrees C (~86 F) and off at 28 degrees C (~82 F). The green LED is the activity indicator and also serves as a "ballpark"....
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This circuit is a simple wire loop alarm that can be used in doorways, hallways, or any other place the tripwire will be broken by intruders. The circuit has a built in siren, but it can be replaced by a relay to drive an external siren, commercial alarm, etc...
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Hi all! I designed this circuit about four months ago, and I had so much fun with it, that I turned it into a kit. I designed the circuit, program, a....
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A laser pulser using the same laser diode LI does. I made the pulser so it could be adjusted from 50 to 20, 000ppm. I tested that on my LIs and rx65, they only alert to pulses from about 100 to 200ppm. I also wonder if my pulsure would work as a jammer if I....
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The timer is used in typical configuration, except that the timing resistor is replaced with the current source based on the op-amp DA1 (741). This solution allowed to obtain a good linearity (better than 3%). With the value of components used in this....
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The remote solar powered LED light takes advantage of the current limited nature of solar photovoltaic cells. If light shines on the solar array, current will flow through the circuit. For a typical size of solar cell, there is a maximum current that can be....
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This little circuit can assist you to get rid of all surplus tiny ac mains adaptors from your desktop. The circuit is nothing, however a sensible dc power box directly powered by the smps of your desktop pc. Regulated, clean and guarded +12VDC is offered at....
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This circuit generates a two-tone effect very much alike the cuckoo sound. It can be used for door-bells or other purposes thanks to a built-in audio amplifier and loudspeaker....
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The relay logic circuit forms an electrical schematic diagram for the control of input and output devices. Component: Resistor, Capacitor, ....
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This circuit was designed to control a 32 channel Christmas light show from the PC serial port. Originally designed with TTL logic, it has been simplified using CMOS circuits to reduce component count. It is a fairly simple, reliable circuit that requires....
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The circuit interfaces a commercial DCF77 receiver (available for about $15) with a PC using the RS232 serial port. By rewriting the program and/or modifying the circuit it`s possible to use also different systems or different I/O ports. The power is driven....
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That circuit will provide an overall gain of one between the output and each input channel. Each input channel includes a single 0.1uf capacitor and 100-Kilohms resistor to provide an output impedance of 100K. The number of input channels to this audio mixer....
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The keypad circuitry is based around a PIC1652 microcontroller that was manufactured by General Instruments. The PIC1652 is an 8-bit microcontroller with RISC-like features and has a 33 single-word instruction set. It supports direct, indirect and relative....
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So to reduce the resonant frequency and get some useful signals, I took some washers slapped them on a bolt and some nuts and experimented. I used aOscilloscopewith FFT and changed the weight on the tip of the film until frequencies of around 40Hz were the....
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I needed a sine wave carrier for a magnetic transponder system I am working on. Various types of crystal based oscillator are available such as the Pierce, but these can be tricky to design and ensure they work correctly. Rich suggested using a square wave....
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I had the prototype working on the breadboard, I built another unit on a piece of Radio Shack Protoboard for use in the field. It came together in only a couple of hours, and again, worked the first time (I must be living right lately). This more rugged....
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Hi, I bought two small servo motors last month. I was thinking what I can do with this two servo, since it is only two in number. Then I asked this to my friend Achu Wilson and he suggested me to try a four legged two servo walker and he shown a youtube....
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Small and interesting circuit that flashes your head lights. Automotive, head lights, circuit diagram. Built around famous NE555 timer circuit....
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Elements and internal function diagram shown in Figure 9-50, c, i, C2 is the feedback capacitance t change in capacity - low frequency change within a certain range of the cuto..
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Here`s an another project, which makes an Scrolling LED display. Here 64 leds which are connected to an Matrix display. The Anodes are drived through an Driver...
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It can detect what`s being typed on it. It can be used to send text to and/or receive text from a computer via USB. It was designed as a platform for playing interactive fiction games, in particular to play custom software being developed for it by Jim....
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Before you begin a project like this remember: mains voltage is dangerous so if you are not 100% sure of what you ’re doing consult a friend who has the skills or, don ’t do it at all ! If you own a motorcycle, a motor home, a caravan, a lawn mover, a day....
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This circuit diagram for a logic tutor kit was made from MS Word graphics...
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Low Voltage Monitor circuit is highly desirable for security and protection against everyday damage your equipment, especially for your favorite car. This circuit may be very simple / very simple to make because only by using ic LM339. The workings of this....
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Electronics Tutorial about Bistable Multivibrator also known as the Bistable Flip-Flop or Two-shot Multivibrator constructed from Transistors or Logic Gates....
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The supply receives + 20 Vdc from the rectifier/filter section. This is applied to pins 11 and 12 of the uA723, as well as to the collector of the 2N3055 series-pass transistor. The output voltage is sampled through R1 and R2, providing about 7 V with....
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There are also other methods of coupling signals from one stage to another. Transformer coupling is the most common method used to couple rf amplifiers. Transformer coupling has many advantages over RC coupling for rf amplifiers; for example, transformer....
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The drawings and photos below are for an operating incline railway that was built by the London Model Railroad Group for its `O` scale model railway club located at London, Ontario, Canada. This is a single car model loosely based on a double car incline....
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Because switching power supply energy-conservation also brings the huge economic benefits, cause the attention of the various circles of society to be popularized rapidly. With the technical development at full speed of power, high frequency, becoming the....
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Door Buzzer by use, IC 555. Perform sound electric bell origin. When press S1 as a result have a voice fair loud. This circuit almost must not do anything. Because divisible Amen! should use 25-80ohm size loudspeakers. will make good sound use force against....
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This stereo noise blanker or suppressor attenuate the noise with 45dB when the music signal is low or null, is just a noise limiter. The noise blanker sens....
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The circuit has negative feedback only for positive signals. The inverting input can only get some feedback when diode Dl is forward biased and only occurs when the input is positive. With a positive input signal, the output of the op amp rises until the....
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The CCD camera sensor is device that have very useful. This project has small size. But quality is a lot good. We can install with Television easily through the video in terminals. and connects to the video signal modulated to To send a broadcast RF signal....
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The TDA7294 is a Hi-Fi amplifier and can give 100W RMS but with 10% distortion. Supplying 30 Volts you can have 50 Watts RMS with 1% distortion. Frequency range start at 16Hz and can reach 100KHz. Make sure you are using good heatsink. The chip supports mute....
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The operation control circuit mainly by the button switch SB21. Contactor KM1 composed contactor KM1 main contact directly control the operation of the main motor Ml. Main motor Ml as the prime mover of the motor slip, the slip clutch can to drag the..
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This is pressure sensor signal conditioning circuit. It is simple and inexpensive circuit because it has small geometry and simple pressure sensor. It just uses...
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This sign I designed uses no microprocessor. It has an eprom and multiple counters. As in most electric signs, the LEDs are matrixed, and strobed very quickly to make it possible for all 70 LEDs to appear lit. This sign is strobed horizontally, unlike most....
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Common base transistor amplifier circuit of a unit Common base amplifier basic structure of the circuit as shown, one of the key components primarily biasing resistor, capacito..
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Be sure to mark clearly on the circuit diagram of a part of each type and size! Thank you! Satisfied with the answer, and additional! Do not tell me there are very general site, so I am looking for. Thank you, brothers and sisters, brothers and sisters,....
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This circuit is mainly intended to provide common home stereo amplifiers with a microphone input. The battery supply is a good compromise: in this manner the input circuit is free from mains low frequency hum pick-up and connection to the amplifier is more....
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Ammeter is a great addition to any Laboratory Power Supply as it will measure the current consumption and help you determine if there are any problems with the circuit that you are building or testing. This amper meter is capable of measuring the current....
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This is a project of a simple metal detector circuit. The circuit is easy to build using only one transistor and few other components. The circuit is a colpitts oscillator which boradcast on AM band. Take a good quality am receiver and place it near this....
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The LCD display is represented by the connector X1. It has a HD44780 compatible LCD controller and I'm using the 4-bit interface to send data to the LCD controller. The LED's are multiplexed. I've seen the circuit somewhere in the web. It is possible to....
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This project can measure the clock pulses fed to the Timer input of the AVR microcontroller. The Bascom code counts the clock pulses for 1 second and display it...
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Here is a high performance radio receiver antenna amplifier for the entire VHF broadcast and PMR band (100-175 MHz) which can be successfully built without....
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Explanation: This is a simple and low-cost broad-band high-frequency electric field strength meters. Field strength of the radio signal into a DC measurement, it is measured. R..
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An isolation transformer and a variable auto transformer, very much like a Variac. Fuse 1 protects against gross overload. Lamp 1, across the Fuse 1, is a red incandescent pilot lamp and it lights up in the event of a blown fuse. Imagine how much time this....
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This circuit shows a typical multiplex system intended to carry one of 8 inputs into a remote location. A 5-V pulse train is sent down a separate channel to perform timing and synchronizing functions. A 15-V reset pulse is superimposed on the 5-V clock,....
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A circuit design, based on a C-mos chip to Drive a Car Ignition Coil. This is a Very Simple and Efficient Design for an Electric Fence. It puts out a Very high Voltage Current pulse, yet it draws a very small average Current from the battery or supply. As....
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This is a low-input impedance conversion circuit with reference resistor RS being connected to the amplifier`s feedback loop and input impedance in approximately zero, and the input current flows into Al`s output end through Rs. The maximum switching current....
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A simple audio amplifier application a TL431 blow regulator. The amplifier will accommodate room-filling aggregate from an accustomed clear radio outfitted with a long-wire antenna and acceptable ground. The chip is agnate in complication to a simple....
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The amplifier is based on the commonly used class-AB complementary power amplifier with compound pair output transistors. The system uses a TL074 quad opamp to drive the output transistors. As can be seen from figure 1, A2 is used to set the voltage gain of....
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A typical two high-pass filter circuit ..
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The circuit for the Digital Tachometer/RPM Counter consists of only a few devices. Wire them up according to the following circuit diagram. The PIC I`m using is on a demonstration board, which means the clock, power and ground pins are already wired up so I....
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On this diagram, you can easilily locate test points related to Applied Voltage and Potential Voltage. For example, isolating one of the heating elements, we can see that there is an N. O. (Normally Open) switch shown wired in series with it, and the....
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A Fence charger or energizer is an equipment which is used for charging(electrifying) a fence or a boundary in order to protect the inside premise from human or animal interventions. Since these boundaries are mostly of large fields and parks, are normally....
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Nowadays, just about every house has an outside lamp with a motion sensor. Such a device eliminates the need to feel your way to the front door, and it apparently also scares away intruders. The only problem is that free-running dogs and cats in the....
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The following circuit shows about USB Powered Audio Power Amplifier Circuit Diagram. Features: multimedia speakers for PCs, has single-chip-based ....
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As shown by the 12kHz 12kHz IF oscillator quartz oscillator, the output level adjustment, level-up circuit and alarm circuit components. It uses a novel single-tuned variable f..
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Develop a self contained unit that can automatically control up to four DCC equipped engines, starting and stopping them based on their position on a loop of track The control PIC interacts with the MiniDCC controller through the MiniDCC`s keypad. Six pins....
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This IC chip was designed specifically for use in power boosting applications in automobiles. It is self protecting against short circuits and thermal problems. In the bridge configuration shown it will deliver 20 watts of power into a 2 ohm speaker....
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Atmega 8535 Color Conversion to Frequency, the technology of instrumentation that can recognize of colors or also known as color sensor, is very urgently needed in the field of industry. This sensor has a lot of its usefulness as for the paint industry until....