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 simple neon lamp power indicator circuit was found in the January 1971 Radio Electronics...
This elementary receiver with only one germanium transistor was found in a Japanese publication from the...
This simple 1 transistor circuit was found in an American documentation from the 60's. The...