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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Telephone Relay (CB25234E)
This circuit was found in the October 1989 issue of Radio Electronics magazine. It drives an...
Exponential Current to Voltage Converter (CB12173E)
The transistors in this circuit from an English publication in 1980 may be the BC548. Operational...
Metronome (CB21925E)
This is one of many circuits of this type that can be found in this section. This one is taken from...