This circuit controls an external light that turns on at dusk and off in the morning. The circuit is from a Radio Electronics from October 1987.
This simple half-wave control using an SCR, which may be TIC106, has been obtained from a US...
I found this circuit in an English publication from 1989. This configuration can be mounted with...
This reader with TTL logic compatible output uses an LM139 comparator. The circuit was found in...