Tone-controlled microphone amplifier (CB20806E)

This circuit was found in American documentation from the 1980s. The integrated circuit used is still common today, but equivalents can be used.

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Spark Gap Transmitter C (CB25005E)
Found in an old publication, this is a transmitter with a spark coil. The high frequency...
Receiver monitor (CB8632E)
This circuit was found in a 90s Hands-On Electronics. When a signal appears at the headphone...
Power Stage for CMOS Circuits (CB12727E)
In the figure we give a suggestion of a high-power stage to excite a speaker with the 2N3055. The...