This circuit is from an old Japanese publication of 1962. The circuit uses two batteries, one for the filaments of the tubes and the other one of high voltage for the plate circuits.
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...