This circuit was obtained in a Motorola documentation from 1968. The circuit uses a power transistor of the time. Modern equivalents according to the load current and voltage can be used.
This circuit was obtained in a 1978 magazine but can be easily assembled today with a BC547...
Found in documentation from the 1980s, this circuit generates signals that can reach a few...
Found in General Electric's 1969 documentation, this circuit uses two Foto Darlingtons to control...