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 first-order high pass filter is applicable to any operation requiring a dual power source. It was...
This circuit can be found in other projects in this site. When S1 is open the circuit produces...
This circuit was obtained in an 80's documentation, making use of a 3-terminal regulator of the...