This circuit was found in a Motorola documentation from 1975. Modern equivalent transistors such as the BF245 can be used. The circuit is powered by 9 V voltage from cells or batteries.
Using a 4017 as a base, this circuit from a 1990s Popular Electronics generates low-frequency...
This diagram from a 1967 documentation shows how to switch high voltage neon lamps with 5V TTL...
This circuit was found in a 90s EDN. It activates a protection relay in case of reversing the...