This circuit was found in a 1969 Mullard documentation. Used transistors can be replaced with modern equivalents. Output transistors may be BD135 and 136 with heatsinks.
The circuit that gave rise to this configuration is from 1978. In the original publication are...
This low distortion circuit was found in a 1964 Electronic Design. The transistor admits...
The Toshiba TLP577x series consists of an infrared photo-emitter (IR) and a sensor integrated circuit...