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.
This circuit was found in Italian magazine (1988), but can be mounted with ease even with the...
In the figure we have a simple shield of 1 transistor. The supply voltage depends on the relay. The...
The operational 714 (not the 741) is an old Raytheon type that is no longer common today. The...