One transistor radio (CB21638E)

Found in a May 1968 Supertena newsletter in Popular Electronics magazine, this mid-waveband receiver can use any general purpose PNP transistor.

Transistor Microammeter (CB3921E)
This circuit consists of an adapter that allows the reading of low currents at various scales. A...
Infrared Alarm (CB14669E)
In this circuit of Texas Instruments an incandescent lamp is used as a light source, and lenses are...
Oscillator and Divider up to 16,384 using the 4060 (CB385E)
The frequency of a XTAL (up to 1 MHz) can be divided by powers of 2 up to 16,384 using the CMOS IC...