Field strength meter (CB7358E)

This tuned circuit was found in a 1966 Electronic Circuit Handbook. The transistor can be any modern general-purpose equivalent.

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Solar intercom (CB20503E)
This circuit can be used in demonstrations or science fairs. The circuit uses headphones and can...
Gel Battery Charger (CB6053E)
We found this circuit in an 80's Electronic Design. The circuit uses an integrated of the time....
Code Practice Oscillator (CB4165E)
This unijunction transistor oscillator is intended for Morse code practice. The circuit is from an...