This circuit that imitates the sound of the cowboys' calls with their “louder” was found in a Hands On Electronics from the 80's. The integrated circuits used are from that time.
This circuit was found in 1980s American documentation. The transducer is a piezoelectric capsule and the...
The voltage regulator integrated circuits of the 78XX series can be found with voltages from 5 v...
This circuit with transistors from a 1995 publication. The circuit is powered by a voltage taken...