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 preamplifier is recommended by Sanyo and is based on its LA3160 integrated circuit. The...
This very low current negative bias source can be used in any inverter. The output voltage is...
This non-inverting AC amplifier was found in the February 1990 issue of Radio Electronics...