This circuit uses a diode as a radiation sensor. The operational ones are old because the publication is from the 80's, but modern low voltage equivalents can be tested.
This Phase-Shift Oscillator produces sine low frequency signals suitable for many applications. It...
This circuit was published in a 1977 Radio Shack catalog. The PNP transistor may be BD135 and NPN...
MCP19124/5 Contains Independent Voltage and Current Control Loops Plus a Full Suite of...