Beacon with instrument (CB20495E)

This circuit causes an instrument needle to oscillate to signal an event. The circuit is powered by solar panel from 1 V.

Motion sensor (CB8762E)
This sensitive motion sensor with inductive sensor was found in a 90s Elektor. The circuit uses only...
Balance Indicator (CB18169E)
This simple balance indicator for sound equipment was found in a 1982 documentation. The M1...
Infrared Audio Link Receiver (CB16695E)
This circuit was found in a 1992 documentation. It uses a photo diode as a receiver and an...