Originally indicated as an alarm alert in a 1990s US publication, this circuit can be used as a shield to control a strobe lamp. The sensor is a optocoupler with LDR.
Found in Popular Electronics from the 90s, this signal tracer or tracer can be used with the inner...
This Power supply is intended to Power small loads with currents up to 30 mA. The voltage depends...
Found in an English documentation from 1977, this circuit activates a relay according to the...