We found this CMOS circuit for excitation of a relay in an old documentation. The transistor is a general-purpose high voltage as used in the power supply.
This circuit was developed to test suspect 4001 and 4011 integrated circuits. The circuit is from...
The power source shown for powering for small TTL circuits was found on a Radio Electronics...
This circuit was found in a Popular Electronics from April 1993. It is a voltage regulator circuit...