Found in an American documentation from the 90s, this circuit makes use of an output transformer for transistors, working with a 6 V power supply.
This circuit was obtained in a Motorola manual, but it applies to almost any operational...
Found in a 1970 EEE this circuit emulates a zener diode whose voltage can be set to R2. Power...
This circuit different from the timer was found in an English publication from 1978. The circuit uses...