This trigger circuit was found in an American documentation from the 1980s. The amplifiers used can be replaced by equivalents with characteristics according to the frequency.
The purpose of this circuit is to detect the movement of a person by the changes in light that...
With this 1986 circuit, as incandescent lamps are no longer used, it is possible to replace the...
This is the application note circuit of the integrated circuit used with the LASER diode. The...