This circuit uses a CMOS integrated circuit as a basic element and can be combined with the previous circuits. The circuit is from a Radio Electronics from May 1990.
This circuit uses an LDR as a sensor to trigger an LED indicator at a preset lighting level. The...
We found this circuit in an American publication from the 80's translated into Portuguese. The...
We found this circuit in an old French documentation from the 70s, but it can be assembled using...