Field strength meter (CB8220E)

This passive tuned circuit was found in a 90s Popular Electronics. The coils must be according to the monitored waveband.

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Signal Injector (CB14464E)
This traditional configuration of astable was found in a 1965 documentation. Transistors can be...
Fixed Frequency VFO and Variable Cyclic Ratio 555 (CB17247E)
This variable frequency oscillator generates signals that have a recurrence frequency determined by...
Function Generator (CB18889E)
This is an old circuit, using operating equipment of the time, modern operational amplifiers can...