Audio Booster (CB6181E)

This reinforcing stages from a 1960s documentation. No information is given about the transformer and the transistor admits equivalents.

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Bicycle Signaler (CB6758E)
This configuration similar to many of this site was found in 1965 General Electric documentation. Modern...
Fence Electrifier (CB11372E)
This circuit is from an American manual from 1974. It uses a diac (Q1) and the SCR can be the...
Crystal dipper and oscillator (CB23926E)
This circuit works both as a grid-dip (transistorized) and as an oscillator. The circuit is from a...