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.

Lie detector (CB7005E)
This simple lie detector was found in Popular Electronics. Transistors are commonly used. The...
TTL Clock with Active Cycle (CB5997E)
This 50% active cycle TTL clock generates signals from 4 to 20 Hz. Its power must be supplied with 5 V...
5 W Portable Amplifier (CB16736E)
Originally in the 1992 publication, this amplifier was recommended for use with record players....