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 different configuration of AM radio with push pull detection and amplification provides good...
This light intensity meter is from a 1978 Texas Instruments optoelectronics manual. The...
This circuit fires a xenon lamp being powered by a 300 V battery. The circuit is from a Radio...