Simple 1-tube receiver (T960E)

This 1V heater tube circuit was found on a Radio Craft from 1945. The circuit is for medium wave and can be used as a tuner.

Side Tone for SSB (CB19978E)
This circuit was found in a documentation for radio amateurs from the year 70. Its purpose is to...
Astable with voltage limitation (CB21826E)
Found in a 1974 Ferranti manual, this circuit uses diodes to limit the voltage on the transistors. The...
Shield TTL and CMOS Low Level C (CB11409E)
The circuit shown can drive loads from 500 mA to 2 A, depending on the transistor with the TTL or...