Medium Wave Transmitter (CB21736E)

Found in Popular Electronics of January/February 1969, this transmitter has a few meters range and can be used as a wireless microphone.

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Fast logarithmic converter (CB9613E)
Found in old documentation, this circuit makes use of amplifiers of the time, uncommon today. Next...
Doorphone and Doorbell (CB18111E)
Although quite simple, the usefulness of this circuit is great. It can even mean gains for those...
Direct Read Inductance Meter (CB12437E)
This circuit converts inductances on two scales into voltages. The circuit was obtained from a...