Simple function generator

CMOS analog multiplexers are commonly utilized in electronic circuits for various applications. This document presents a modified circuit based on a design by Dave Jones, aimed at constructing a black burst generator. Sync signals are essential in video systems...

A simple phone automatically displays the recording circuit. In this circuit, after the call, the Ming sound start switch K is activated by the sound of the automatic message HFC5209D. The described circuit functions as an automatic call recording system...

This circuit represents a simple yet accurate 1Hz timebase generator utilizing a standard quartz clock circuit board. The described circuit employs a quartz crystal oscillator, which is known for its precision in generating stable frequencies. The standard quartz clock circuit...

This circuit provides an alert when a door that should remain closed is left open. It is designed to be attached to a fire door, allowing normal passage. If the door remains open for more than 30 seconds, a...

The design features a buffered virtual ground circuit implemented using an LM741, LM318, or similar operational amplifier. This circuit establishes a fixed voltage that is midway between the input voltage and ground. This fixed voltage serves as the virtual...

The application circuit depicted is a complementary sawtooth generator. In the schematic, VT1 is the transistor with a base current limiting resistor, which prevents excessive base current flow through the crystal tube. The resistor R4 acts as a bleeder...