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.
This test consists of a simple Hartley oscillator using a transformer of the type found on older...
The integrated circuit used in this 80's application is not common today. However, modern...
This circuit is from 1983 documentation. The author shows us an experimental circuit of a siren...