This Motorola circuit is from 1965. Collector currents must be 7 and 12 A for transistors. Equivalents may be used. The circuit is for contact breaker cars.
This useful inductance bridge was found in a Radio Electronics from September 1963. The...
This circuit is a handset receiver that picks up the signal emitted by a coil under the rug or...
This circuit found in the October 1975 issue of Radio Electronics magazine uses an integrated...