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 stage was found in a 1964 Electronic Design. The transistors are of the time and the shape of...
This circuit with the known PLL 567 can be found in other versions in this section and in this...
In this circuit, the LED Will blink in a presence of na áudio signal in the input. Gain is...