This circuit is from a Texas Instruments manual from 1968 but can be applied to current controls using modern Triacs. The circuit is for a current of 25 A per triac.
This circuit controls a relay causing it to open and close its contacts at a speed that depends on the...
This circuit from Ferranti was released in 1969. It makes use of the company's transistors that admit...
This photoelectric circuit was found in a 70’s Ferranti's documentation. The circuit uses an...