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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Model Train Control (CB12092E)
This circuit is from an Italian publication from 1988, but it can be assembled today because the...
Wien Bridge Oscillator (CB9039E)
This low frequency sinusoidal oscillator was obtained in documentation from the 1970s. Operational...
Rectangular oscillator (CB10134E)
This conventional astable multivibrator circuit with operational amplifier can be found elsewhere on...