Found in an 90s Electronic Design, this circuit provides a 110 dB output to a ceramic transducer. The transducer is of the type available at the time.
E) Found in Popular Electronics from the 90s, this generator uses integrated circuits from that...
This circuit is from a Radio Electronics magazine from August 1976. The module used is from that...
This old configuration, using a unijunction transistor (UJT) controls a LED than blinks if an...