35 W Amplifier (T359E)

This class AB2 amplifier was obtained in a 1937 RCA tube manual. The circuit includes the dual high voltage power supply.

12 V Regulated Source for Tube Filament (CB20286E)
Originally created to feed the filaments of a 12AX7 as an audio preamplifier to eliminate the...
LM3914 20-LED Voltmeter (CB25457E)
This circuit has a scale of 0 to 2.56 V, but it can be changed by changing the values of the...
Electronic Doorbell (CB12331E)
I found this circuit in an old documentation from 1982. The circuit can be assembled with the...