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 was the original title given by the publication of the 80s in which we found it. Similar...
This circuit is from the 1983 Intersil manual. The display is a 4.5-digit LCD, and the power...
This V/F converter was published in the June 1991 issue of Radio Electronics magazine. The...