This power step for relay activation was found in the 1964 RCA transistors manual. The circuit is of the NF type and the transistors admit equivalents. R4 depends on the drive voltage.
The presented circuit triggers the relay when S is pressed for an instant, keeping it in these...
This circuit uses common components in our market, despite being from a 1996 publication. The...
This circuit was obtained in an old English magazine from 1976. However, the components can still...