Wall transmitter (CB21876E)

This circuit sends its signals through a wall acting as an FM spy. The circuit is from an Australian publication from 1991.

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741 Fast Low Impedance Amplifier (CB13538E)
This circuit, from a 1973 publication, shows how to obtain a fast, low impedance output for a 741....
Home Alarm (CB17125E)
This circuit was found in a 1999 documentation, but the components it uses can still be easily...
50 to 150 MHz oscillator (CB9629E)
This overtone oscillator can generate signals up to 150 MHz. The crystal determines the frequency and...