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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Locator transmitter (CB8729E)
This circuit was found in a 1993 Electronics Hobbyst Handbook. The circuit operates in the FM...
Three-phase tester (CB8297E)
Found in a 90’s Electronic Engineering, this circuit tests the three phases of such a supply. The...
MW Wireless Microphone (CB4516E)
The microphone of this short-range MW transmitter should be low impedance magnetic (a small...