This circuit is from the time when cars used contact breakers. This 80's version measures the dwell angle of the contact breaker for dwell adjustment using an era integrated circuit, the LM3917.
This circuit is for a siren that can be used with any of the above alarms and also other types. The...
This circuit can be used on a 0 to 14 V source with a current of 1 A. The PNP power transistor can be the...
This TTL circuit was found in the February 1973 issue of Radio Electronics magazine. The power...