The time of this timer depends on C1. The circuit was found in the July 1994 Electronics Now magazine. The supply voltage depends on the relay and can go up to 12 V.
The circuit shown is from the 1994 Linear Applications Handbook by National Semiconductor. Some of...
This simple transistorized radio for listening on a crystal phone was found in a Japanese...
In the MEMs line of the ST available on Mouser Electronics we highlight the MP23AB01DH audio...