This circuit is from the 80's documentation. The integrated circuit is from the time but can be implemented with modern equivalents. The power supply must be symmetrical.
The transistors of this circuit found in a 1965 magazine can be the BC558 and the sensitive 12 V x...
This circuit is from a Radio Electronics from December 1964. The components are from the time and...
Found in General Electric's 1969 documentation, this circuit uses two Foto Darlingtons to control...