This circuit was found in Delco documentation from 1965. The transistor is of the time, but any current power PNP with at least 500 mA collector current and 100 V collector voltage can be used.
This is a complete version of the previous circuit, with several scales and two transistors, one...
This PLL circuit was found in the April 1978 issue of Radio Electronics magazine. The circuit is...
This high-power amplifier that comes close to 400 W peak uses unusual high-power transistors...