This Star Trek red alert circuit was found in the July 1990 issue of Radio Electronics magazine. The power transistor must be equipped with a heat sink.
Found in a Popular Electronics from the 90s, this circuit uses thermistors for low noise...
The Buck-type DC-DC converter (voltage lowerer) shown in figure 11 is suggested by Analog Devices...
This 4-20 mA current interface was found on a 90's EDN. The components used are not common today and...