This circuit is from a 1972 German magazine Funkshau. The circuit can use BC548 transistors instead of BC108 and works with 9 V power. The sensor is a common LDR. The indicator is a 1 mA full-scale milliammeter.
This circuit is from a 1972 German magazine Funkshau. The circuit can use BC548 transistors instead of BC108 and works with 9 V power. The sensor is a common LDR. The indicator is a 1 mA full-scale milliammeter.