This circuit is from a time when this type of feature was not common in line cars. The pulse transformer has a 1: 1 turn ratio and the SCR admits equivalents.
This circuit trips when the input signal goes through zero, triggering a direct current load. The...
This circuit is suitable for recovering vinyl media, having been found in an old sound magazine from...
CMOS integrated circuits are sensitive to supply voltages in terms of signal propagation time....