This windshield wiper timer was obtained in an 80's Hands On. The transistor can be the BC548 and the relay is 12 V sensitive. The time is set to R3.
This JFET amplification stage was found in the April 1993 issue of Electronics Now. The input...
This circuit with TTL output was found in a 1968 EEE. The transistor can be of general use. The...
Using a piezoelectric sensor of the time, this circuit was found in the February 1994 issue of...