Oscillator circuits

It had been a little over a decade since the invention of the transistor when this article appeared in the August 1959 edition of Popular Electronics. Transistors were still a mystery to many, including engineers, technicians, and hobbyists. Author...

In conventional triangular-wave oscillators, hysteresis from positive feedback in the Schmitt trigger determines the voltage levels and amplitude of the triangular waves. With this topology, it is difficult to independently vary the voltage levels and amplitude of the output...

Invert a signal to drive FETs with rapid rise and fall times. It was suggested to use an inverter (not a chip) instead of logic chips, which are designed to be either fully ON or OFF. The individual has...

A field strength meter utilizing a biased Schottky detector employs a temperature-compensated Schottky diode within an amplified, untuned field strength indicator powered by two AA cells. This device indicates the relative field strength of RF fields ranging from a...

This CMOS square-wave oscillator utilizes the 4047 multivibrator circuit, suitable for both monostable (one-shot) and astable applications. In the provided configuration, the 4047 operates as an astable multivibrator. The circuit features three outputs from the 4047, with the first...

This page shows some methods of track routing control for Stall-Motor type switch machines. The principle method uses a 2 Pole - Multi Position rotary switch while an alternate uses optoisolators and transistors to select the routes. The last...