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Variable astable frequency oscillator – Circuit Schematic
Variable astable frequency oscillator
This is a very simple circuit utilising a 555 timer IC to generate square wave of frequency that can be adjusted by a potentiometer. With values given the fr...
Ultrasonic Pest Repeller schematic – Circuit Schematic
Ultrasonic Pest Repeller schematic
It is well know that pests like rats, mice etc are repelled by ultrasonic frequency in the range of 30 kHz to 50 kHz. Human beings can't hear these high-frequen...
38KHz or 40KHz signal generator – Circuit Schematic
38KHz or 40KHz signal generator
The small 8-pin PIC12C508 is pre-programmed to generate our 38KHz carrier frequency by simply pulsing I/O-pin GP1 (shown above). The PIC will generate either 38...
Zener Oscillator circuits – Circuit Schematic
Zener Oscillator circuits
These two circuits are interesting from an academic point of view. Their practical implementation is rather critical and it is not easy to get steady operation....
Simple SCR oscillator – Circuit Schematic
Simple SCR oscillator
Silicon controlled rectifiers (SCR) can easily oscillate if there is an inductor (a speaker coil in this case) which gives just enough extra voltage to complete...
Oscillators for Buzzers and telephone Earpieces – Circuit Schematic
Oscillators for Buzzers and telephone Earpieces
In order to generate a single note you may try these simple circuits. With only three components you may implement some basic buzzers. You need a telephone earp...
CMOS PLL circuit – Circuit Schematic
CMOS PLL circuit
One of the most interesting projects to work with is that of a synthesizer that can accurately gnerate desired frequencies. This synthesizer uses just three CMO...
Clock pulse generator for CMOS – Circuit Schematic
Clock pulse generator for CMOS
Excellent clock generator to drive 4017 type cmos circuits. R1 = 10K to 10M, C1 = 100pF to 47uF. Fo is ±1Kz when R1=100K and C1=10nF. Input voltage can be from...
variable Hartley oscillator – Circuit Schematic
variable Hartley oscillator
Hand and body motions in proximity to the sensing antennas produce frequency changes in a Hartley oscillator operating at approximately 750kHz. The signal from ...
555 Flasher II – Circuit Schematic
555 Flasher II
Here is a Simple Circuit to give a Flashing LED, With a "Rising and Falling" Brightness. It Uses the Sawtooth waveform from pins 2 and 6 to create the rise and ...
Morse Code astable Oscillator – Circuit Schematic
Morse Code astable Oscillator
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-c...
7 MHz VFO – Circuit Schematic
7 MHz VFO
A 7 MHz oscillator with a variable crystal oscillator (VXO) operates very stably, but it allows only a small frequency variation (approx. 5 kHz). In contrast, a...
VCO with NE567 – Circuit Schematic
VCO with NE567
Who would like to build a sidetone oscillator with a minimum amount of parts should try the NE567 integrated circuit. The NE567 is a PLL circuit with an interna...
8 stages LFO analogue sequencer – Circuit Schematic
8 stages LFO analogue sequencer
The CD4060 is a CMOS 14-stage binary counter with an internal oscillator on chip. The oscillator is controlled by the resistors and capacitor tied to the timing...
Function Oscillator using 8083 – Circuit Schematic
Function Oscillator using 8083
Built around a single 8038 waveform generator IC, this circuit produces sine, square or triangle waves from 20Hz to 200kHz in four switched ranges. There are bo...
Mini Organ using timer 555 – Circuit Schematic
Mini Organ using timer 555
This circuit operates as a astabiele multivibrator. With switch S9 can 'octave' chosen. The tones are set by P1 to P8. Pressing S1 to S8 displays the correspond...
Crystal Clock Generators – Circuit Schematic
Crystal Clock Generators
Here exist a small collection from three generators, what using crystal for basic production of oscillations. Each generator uses different topology of circuit ...
Frequency Generator circuit – Circuit Schematic
Frequency Generator circuit
This is a useful instrument for works hops. The standard of the produced frequencies is 10 to 1. The basic frequency is produced by a crystal with high accurac...
10MHZ to 1MHz converter – Circuit Schematic
10MHZ to 1MHz converter
This circuit is an oscillator at frequency 10MHZ, using IC 1A and IC1B and a frequency divider. Using the IC2 it divides the pulses to 10. IC1C is a buffer. Th...
Square wave oscillator – Circuit Schematic
Square wave oscillator
The generators of square pulses, are used in a lot of applications, between which the adjustment of conditions of entry in the digital circuits and the control ...