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 is a handset receiver that picks up the signal emitted by a coil under the rug or...
Books and e-Books by Institute NCB 100 CIRCUITS - SHIELDS FOR ARDUINO FUN PROJECTS FOR THE...
This circuit for the logic control of the 555 in a power supply was found in the October 1989...