4093 Sine Square Converter (CB26335E)

Found in a Popular Electronics from the 90s, this circuit operates up to about 5 MHz input.

Assembling a Darlington (CB23855E)
An article in Radio Electronics magazine from November 1962 taught how to connect two common...
Schmitt trigger (CB21475E)
In the figure we have the way to use the transistors of an old-paired pair as a trigger circuit. The...
500 mW Amplifier Powered by the Grid (CB20039E)
This amplifier is from Motorola documentation from the 70s. The circuit uses transistors from the...