This is the receiver from the previous alarm system. The circuit is from Radio Electronics, April 1989, and has an LDR as the sensor. Optical devices should be used to improve performance.
This circuit was obtained in an Argentine publication in 1976. It consists of a series voltage...
This circuit was found in a. transistor Manual from 1958. This is an amplifier stage with a...
This regulator circuit was found in the June 1984 issue of Radio Electronics magazine. The LM11 is a...