Found in a 1968 Novel Electronics Circuit, this circuit compares two light intensities using common LDRs as sensors. Transistors can be modern PNP equivalents.
This circuit causes an LED to blink when night falls. Sensitivity is set at R1 and the blinking...
This amplifier with the AC187 and AC188 pair and the CA3130 integrated circuit was found in an...
This circuit is from a 1998 Electronics Now and can be easily assembled since it uses a common...