This circuit was obtained from a 1970s RCA. The circuit uses LDRs as sensors. The resistors depend on the A / D converter used. The circuit can be used as a shield.
This circuit was obtained in a 1978 magazine but can be easily assembled today with a BC547...
Found in documentation from the 1980s, this circuit generates signals that can reach a few...
Found in General Electric's 1969 documentation, this circuit uses two Foto Darlingtons to control...