Found in a 90’s HAM Radio, this circuit is used for an optical communications system or even audio transmission by optical fiber. The components are common.
Found in a 1974 Ferranti manual, this circuit uses diodes to limit the voltage on the transistors. The...
The NE566 used in this circuit and a PLL from Philips Components. The period T of the generated ramp...
This circuit was suggested in a 1976 documentation. We can use the pair BD135 and BD136 on the...