Schmitt trigger crystal oscillator

A stable variable crystal oscillator (VXO) utilizing 6- or 8-MHz crystals employs a capacitor and an inductor to facilitate frequency pulling on either side of series resonance. The described circuit operates as a variable crystal oscillator, which is crucial in...

Transistor Q1, a 2N3563, and its associated components form an oscillator circuit that will oscillate if, and only if, a good crystal is connected to the test clips. The output from the oscillator is then rectified by the 1N4148...

A variable Wien bridge provides frequency tuning from 20 Hz to 20 kHz. Gain control comes from the positive temperature coefficient of the lamp. When power is applied, the lamp has a low resistance value, resulting in high gain...

This free-running square-wave oscillator utilizes two NPN transistors. The output frequency is approximately 300 Hz with the specified component values. The circuit operates as a basic oscillator, generating a square wave output through the interaction of two NPN transistors. The...

The drain of the JFET Miller oscillator is tuned to the resonant frequency of the crystal by an LC tank circuit. The JFET (Junction Field-Effect Transistor) Miller oscillator is a type of oscillator circuit that utilizes the properties of a...

There is a significant amount of vintage amateur equipment that many enthusiasts have chosen to restore and rejuvenate. Although many early amateur transceivers operate effectively, they typically lack a digital readout and depend on analog dials for tuning. The...