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100KHz Crystal Oscillator – Circuit Schematic
100KHz Crystal Oscillator
There is a great deal of old amateur gear which many amateurs have decided to restore and bring back to life. While much of the early amateur transceivers work ...
How to make an Astable or Free running Multi vibrator using 741 Op-Amp – Circuit Schematic
How to make an Astable or Free running Multi vibrator using 741 Op-Amp
The non-sinusoidal waveform generators are also called relaxation oscillators. The op-amp relaxation oscillator shown in figure is a square wave generator. In g...
Build A Low-Cost Function Generator – Circuit Schematic
Build A Low-Cost Function Generator
This low-cost function generator, based on the Maxim MAX038 high-frequency waveform generator, produces sine, triangle, and square waves from under 1 Hz to over...
Analysis of a Digitally Controlled Wien Bridge Oscillator – Circuit Schematic
Analysis of a Digitally Controlled Wien Bridge Oscillator
It uses standard components, gives a good sine wave and is fairly immune to the type of op ampit is designed around. It can, however, be misunderstood, and over...
Low-voltage oscillator features increased spectral purity – Circuit Schematic
Low-voltage oscillator features increased spectral purity
A common problem in crystal sinusoidal oscillators is the excitation of unwanted modes of the quartz crystal that degrade the spectral purity of the oscillator....
Digital Sine-Wave Generator Produces 0?° To 360?° Phase-Shifts – Circuit Schematic
Digital Sine-Wave Generator Produces 0?° To 360?° Phase-Shifts
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Triangle/Square-Wave Oscillator Serves Dual Purpose – Circuit Schematic
Triangle/Square-Wave Oscillator Serves Dual Purpose
In conventional triangular-wave oscillators, hysteresis from positive feedback in the Schmitt trigger determines the voltage levels and amplitude of the triangu...
Swept sine oscillator has quadrature output – Circuit Schematic
Swept sine oscillator has quadrature output
Signals with a know frequency but unknown phase may be detected using an in-phase and a 90 ° shifted reference signal, as frequently used in lock-in amplifiers...
Simple sine-wave generator has no low- or high-pass filters – Circuit Schematic
Simple sine-wave generator has no low- or high-pass filters
Generating sine waves with controlled frequencies over a wide range is difficult when using RC or LC sinusoidal oscillators. However, this performance can be si...
A new stable RC pulse generator – Circuit Schematic
A new stable RC pulse generator
This familiar circuit can be implemented with any rail-to-rail-output comparator or the venerable LMC555. The output period is given by 2log(2)RC = 1. 386RC, an...
Battery-Powered Sine Generator Covers 100 Hz To 10 kHz – Circuit Schematic
Battery-Powered Sine Generator Covers 100 Hz To 10 kHz
This circuit, a modification of a function-generator circuit, comprises a battery-powered sinewave generator that is continuously adjustable from 100 Hz to 10 k...
Symmetry Feedback Maximizes Function Generators Linear Sweep Range – Circuit Schematic
Symmetry Feedback Maximizes Function Generators Linear Sweep Range
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...
Standalone Circuit Converts Square Waves To Sine Waves – Circuit Schematic
Standalone Circuit Converts Square Waves To Sine Waves
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 l...
Servo Circuit Controls Sine-Wave Amplitude – Circuit Schematic
Servo Circuit Controls Sine-Wave Amplitude
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 pea...
µP-Controlled Oscillator Delivers Rock-Bottom Distortion – Circuit Schematic
µP-Controlled Oscillator Delivers Rock-Bottom Distortion
Function generators often play a critical role in the design, testing, and operation of encoders, modulators, demodulators, and measurement instruments. Here`s ...
Crystal Oscillator Features Low Current Low Startup Voltage – Circuit Schematic
Crystal Oscillator Features Low Current Low Startup Voltage
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...
ultrasonic transmitter circuit – Circuit Schematic
ultrasonic transmitter circuit
The circuit uses a 555 timer IC configured as an astable multivibrator, i. e. , it generates a continuous signal of a set frequency as long as its reset pin (pi...
sine wave generator circuit – Circuit Schematic
sine wave generator circuit
This is a circuit for generating a sine wave from a single operational amplifier. The feedback loop of the op amp in this circuit (741) consists of a twin-T fil...
Electronic mosquito repeller circuit diagram – Circuit Schematic
Electronic mosquito repeller circuit diagram
The circuit is based on the theory that insects like mosquito can be repelled by using sound frequencies in the ultrasonic (above 20KHz) range. The circuit is n...
Wide Frequency Range 555 VCO – Circuit Schematic
Wide Frequency Range 555 VCO
The 555 frequency can be varied via adjusting the voltage at pin 5. However, the range and linearity of frequency adjustment is very limited. This is a way to g...