Paraphase amplifier (T389E)

This 6C5 tube circuit was found in a modern tube design manual. The circuit applies to other equivalent triodes.

Digital Motor Control (CB25629E)
This circuit uses a switch to select the direction of rotation of a DC motor. It was found in the...
Audio Switch (CB13687E)
The transistors on this 1975 circuit can be BC548 and BC558. The circuit uses a symmetrical source...
Thermostat with Triac (CB25081E)
We found this circuit in the October 1987 Radio Electronics magazine. The triac must be controlled...