Mini Radio AM (CB20322E)

In this receiver the is formed by 80 turns of wire 28 or close in a ferrite rod. The handset is low impedance and powered by a standard battery.

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Modulated infrared transmitter (CB7028E)
We found these circuits in a Popular Electronics from the 90s. The circuit has a simple low power...
Simple Diodes Test (CB14700E)
This LED diode test is suggested by the Texas Instruments optoelectronics manual. The transformer current...
RF Monitor (CB21686E)
This RF monitor or field strength meter can use instruments from 100 uA to 1 mA full scale. The...