This circuit is from an American documentation from 1975. The circuit uses components of the time which can be replaced by modern equivalents. The coupler is homemade with a lamp and a photocell.
This configuration enables the use of low current switches or sensors to control high power loads...
We found this circuit in an old amateur radio manual. The circuit makes use of PIN diodes to...
The purpose of this circuit is to invert the phase of a noise and apply it to the environment in...