We found this circuit in an American documentation from the 80s. The integrated circuits are operational amplifiers of the time. We can test modern comparators like the LM339.
This voltage regulator for automotive use was found in a Radio Electronics from the 80s. The Q3...
This instrument was found in a publication for radio amateurs in 1973. The tuned circuit consists of...
This circuit is found in a 2005 Linear Technology application manual. The circuit monitors the High...