Two-Tone Audio Generator (T326E)

This 1965 circuit generates 250 to 2,000 Hz tones with quality sine waveform. The power supply is not given and the tubes are of well known types.

High Gain Amplifier (CB4250E)
This high gain small signal amplifier circuit was found in an old publication on transistors....
Third Brake Light (CB4783E)
This circuit was found in a Popular Electronics of the 90s. It operates a third brake light that...
APR345 Rectification Synchro Controller (COM114E)
September 2016 - It can be purchased from Mouser Electronics the new rectification controllers...