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 bridge for the measurement of low value resistances and high values too. The circuit...
This circuit was found in Radio Electronics magazine from April 1961. The device has a slot for...
We found this circuit in an English publication. The transistor can be a BC558. The instrument can be...