This circuit was found in a Popular Electronics of the 90's. The circuit makes use of common components today and several sensors can series connected.
This circuit can control the power from 0 to 70% of the maximum power on a load. The circuit was...
This circuit was found in an English publication from 1989, but it can be easily assembled, as the...
Found in the March 1992 Radio Electronics magazine, this circuit has two supply voltages. The...