This simple very low power circuit can be used in a battery powered infrared tone trigger. We found it in an American documentation from the 90s.
This high-gain amplifier was found in the March 1994 issue of Electronics Now magazine. The...
Here is an interesting project for those who own a pool and are afraid that someone will fall into...
The sensor of this circuit is a common diode, and the measured range is from -10 to + 40º C. The...