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Square Wave Oscillator II – Circuit Schematic
Square Wave Oscillator II
Using two gates from a CMOS 4011 NAND chip, a simple aquarewave oscillator can br made. Alternatively a CMOS 4001 chip can also be used, or a TTL equivalent. In...
Metronome with CA741 – Circuit Schematic
Metronome with CA741
This circuit uses a couple of Op-amps to produce an interesting sound effect. The left hand CA741 is wired as a standard astable and produces the timing pulses,...
Insect Repellant – Circuit Schematic
Insect Repellant
Repell those repugnent insects from your Garden this Summer with this insect repellant circuit. Designed by Graham Maynard the circuitry consists of a phase loc...
Arc Welder Simulator – Circuit Schematic
Arc Welder Simulator
The arc welder simulator is made up from several functional blocks: five oscillators, two gates and the output driver. IC1A, IC1B and IC1C are all wired as squ...
Gate Deep Oscillator – Circuit Schematic
Gate Deep Oscillator
It`s just a variable oscillator based on a bf245 or k 161 fet. By changing the coil it can generate frequency between 0.5 and 300 MHZ. this circuit is useful ...
10MHz DDS Sine/Square Function Generator AD9835 – Circuit Schematic
10MHz DDS Sine/Square Function Generator AD9835
An extremely simple and low cost Sine/Square wave generator based on the Analog Devices AD9835 Direct Digital Synthesis (DDS) Generator chip. The frequency can ...
DPP adds versatility to VFC – Circuit Schematic
DPP adds versatility to VFC
The basic VFC (voltage-to-frequency converter) in Figure 1 comprises an integrator (IC1) and a Schmitt-trigger circuit (IC2). The integrator converts the dc inp...
Multilayer capacitor doubles as varactor – Circuit Schematic
Multilayer capacitor doubles as varactor
The circuit is also an inexpensive VCO (voltage-controlled oscillator) with only five components. Many types of ceramic capacitors for surface-mount placement a...
Inverters form three-phase VCO – Circuit Schematic
Inverters form three-phase VCO
The inspiration for the VCO in Figure 1 came from Texas Instruments application notes of years ago, detailing the use of unbuffered U-type inverters for use...
Sine to Square wave Converter – Circuit Schematic
Sine to Square wave Converter
This circuit is intended to provide good square waves converting a sine wave picked-up from an existing generator. Its main feature consists in the fact that no...
Pierce-gate oscillator – Circuit Schematic
Pierce-gate oscillator
The Pierce-gate oscillator of Figure 1 is well recognized by most designers, but few understand how to specify the crystal correctly. The crystal used in the to...
Test Signal Generator – Circuit Schematic
Test Signal Generator
This signal generator uses a three channel DAC to generate Composite video signal (CVBS) and S video signal (Y/C separated) at the same time, left one channel i...
Test Signal Generator – Circuit Schematic
Test Signal Generator
This signal generator uses a three channel DAC to generate Composite video signal (CVBS) and S video signal (Y/C separated) at the same time, left one channel i...
Programmable Clock Oscillator – Circuit Schematic
Programmable Clock Oscillator
This is a voltage controller oscillator that was designed as a wide range oscillator to generate clock pulses for a stepper motor drive system. It does however ...
Programmable Clock Oscillator – Circuit Schematic
Programmable Clock Oscillator
This is a voltage controller oscillator that was designed as a wide range oscillator to generate clock pulses for a stepper motor drive system. It does however ...
Replacement For The LM3909 LED Flasher / Oscillator – Circuit Schematic
Replacement For The LM3909 LED Flasher / Oscillator
This page features a replacement circuit for the LM3909 LED Flasher / Oscillator using discrete components. The circuit is functionally the same as the integrat...
Replacement For The LM3909 LED Flasher / Oscillator – Circuit Schematic
Replacement For The LM3909 LED Flasher / Oscillator
This page features a replacement circuit for the LM3909 LED Flasher / Oscillator using discrete components. The circuit is functionally the same as the integrat...
Self Oscillating Amplifier for Distortion Testing – Circuit Schematic
Self Oscillating Amplifier for Distortion Testing
The circuit is based on a simple inductor-capacitor filter circuit, and needs only a pot and a small light bulb to set and stabilise the oscillation. The frequ...
Self Oscillating Amplifier for Distortion Testing – Circuit Schematic
Self Oscillating Amplifier for Distortion Testing
The circuit is based on a simple inductor-capacitor filter circuit, and needs only a pot and a small light bulb to set and stabilise the oscillation. The frequ...
Pulse-Generator & Signal-Tracer – Circuit Schematic
Pulse-Generator & Signal-Tracer
This simple circuit generates narrow pulses at about 700-800Hz frequency. The pulses, containing harmonics up to the MHz region, can be injected into audio or r...