We found this circuit in the October 1996 Electronics Now magazine. The circuit uses LDRs as sensors and drives relays. The relays must have voltages according to the power supply.
This is a common crystal oscillator configuration with 80s transistors. The circuit has the...
This circuit was found in a 90’s RF design. The circuit has an output frequency of approximately 100...
This one-digit photometer using CMOS circuits was found in a 1989 documentation. The circuit is...