Repository-circuits
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It's based on a Philips class-H audio amplifier IC and can deliver 36W RMS OR 70W music power, all from a 13.8V supply. Our new Mighty Midget Amplifier can really pack a punch - around 36W RMS continuous into a 4-ohm load when using a 13.8V supply..... -
An H bridge is a kind of circuit you use to control the direction (and sometimes speed) of an electric motor, using only a single polarity voltage (you need to reverse the way current flows in order to reverse the way the motor rolls). You have 4.... -
Designing a power supply that meets the demands of Power over Ethernet (PoE) and Voice over Internet Protocol (VoIP) applications can be challenging. The low component-count power supply depicted in the figure meets these specifications without the need for.... -
Three devices in a quad Schmitt Trigger and a Flip-Flop make a simple but sensitive proximity sensor.. -
A Pierce (crystal) oscillator intended to provide a reliable clock signal for at least 1 year when powered by battery voltages as low as 2.4 V.. -
Cypress` Dave Van Ess cautions circuit designers about the sloppy overuse of op amps with examples and circuit theory.. -
The transition from diodes to synchronous-rectification (SR) MOSFETs in secondary circuits of flyback converters increases with each new generation of MOSFETs, improving performance at little or no cost penalty. SR MOSFETs can be more efficient than diodes,.... -
This design idea overcomes a significant problem with using photodiodes in fast applications like barcode scanners, CD-ROMs, and DVDs--high output capacitance of the diode. The key part in the circuit is the Analog Devices AD8014..
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analog-to-digital converters (ADCs) | printed-circuit board (PCB) | microcontroller or digital signal processor (DSP) | total-harmonic-distortion (THD) | ignal-to-noise ratio (SNR)... -
Author Jim Walker describes a very low cost analog delay line circuit using parts such as the LM311 comparator and 74HC74 D flip-flop...
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The video circuit illustrated in Figure 1 combines an audio-subcarrier notch filter and group-delay equalization as required by the ITU-470 standard. It also includes an amplitude-adjustment capability for driving an RF video modulator in NTSC applications.....
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A simple linear voltage-controlled amplifier can be constructed with one op amp and two JFETs (see the figure). The amplifier can achieve an 80-dB dynamic control range with less than ±0.2% linearity error for 0 V ...
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Over-Temperature Alarm Circuit Uses Common, Inexpensive Components | Negative-temperature-coefficient (NTC) thermistor, ICs...
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Function generators often play a critical role in the design, testing, and operation of encoders, modulators, demodulators, and measurement instruments. Here`s an inexpensive way to build a bus-controlled sinewave oscillator that has downright low....
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A simple yet effective circuit to generate a POTS-compatible ringing voltage can be made from National Semiconductor`s LM4871 audio-amplifier IC and a dozen passive components ( see the figure ). This circuit delivers 1 W of sine-wave output at about 70 V....
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Small inductance changes on the order of 0. 01% can easily be sensed over a wide range with a simple circuit connected to a serial port ( see the figure ). Using a classic Colpitts oscillator interfaced to an eight-pin Atmel ATtiny12-8 microprocessor, the....
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The figure shows a schematic for an oscillator amplitude-control servo system. The circuit creates a closed-loop system that supplies a fixed and adjustable peak-to-peak amplitude ac signal centered around 0 V. A 1-kHz sine wave, labeled AC_INPUT, is.... -
Temperature-indicator and temperature-based products have generated wide interest. There are numerous applications for such devices with many possible solutions, each with its own advantages and disadvantages. This idea discusses a sensor interface that.... -
Incremental-rotation or linear encoders are very common, but normally they do not provide a direction signal. This design shows an easy way to detect forward or reverse direction. Incremental encoders normally provide two output signals, usually named.... -
TI`s Dafydd Roche completes his 4-part series on sound-bar design with a detailed explanation of clock design for the digital portion of the circuit.. -
Many microcontrollers or PICs will have uncommitted digital-to-analog converter (DAC) outputs that can be used to generate sine waves. But these are generally low resolution (8 to 10 bits), yielding a total harmonic distortion (THD) in the 1% range. Or,....
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This basic VCO/waveform generator IC circuit includes a voltage follower loop (formed with IC1) and symmetry feedback loop (IC3) to eliminate an asymmetric duty cycle, which would cause distortion at low frequencies. Fig 2. The VCO used in this circuit.... -
This version of the trigger circuit for the stop-motion camera system uses an electret microphone for a sonic input, but the designer can substitute an LED and photodiode pair to create an optical trigger. For a recent home-brew project, I built a.... -
By adding only a few components, you can turn a temperature- and beta-compensated current sink into a common-emitter (CE) amplifier that maintains a stable biased operating point. This Idea for Design will show you how.. -
At the time, I wanted to build The Ultimate Continuity Tester, and I established a wish list of all the features I required: A real continuity tester. Too many multimeters and sounders react at resistances as high as hundreds or even thousands of ohms,.... -
Capacitive sensors are found in a wide range of equipment, from consumer electronics to industrial/process control. Touch buttons are increasingly found in lamps and dimmers. Motion detectors can detect miniscule changes in deflection. Hygrometers indicate.... -
Author Mazi Hosseini describes a simple, low-cost, voltage-controlled current source using two op amps that provides a good range of current and maximum load..
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Below 10 MHz, the realization of engineering models is fairly straightforward and not critically dependent on pc-board layout. At VHF, parasitic circuit elements and spurious coupling can wreak havoc with attempts to achieve performance at low cost without....
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The R-C twin-tee passive circuit supplies band-reject (notch) filtering to portable applications. It has a circuit Q (loaded) of 0. 25. Satisfactory rejection can be achieved when the bridge is balanced (close tolerances of adjustable components) and the....
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When supply voltage drops below a minimum threshold, it`s often good practice to disconnect the supply from the system to prevent poor performance or erratic operation. The circuit shown accomplishes this with minimal cost, board space, and complexity ( see....
New Circuits
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This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of.... -
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is.... -
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to.... -
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This.... -
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the.... -
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,.... -
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the.... -
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power.... -
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
Popular Circuits
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