This sonic control circuit for a small robot turtle was obtained in an American documentation from 1967. The circuit uses a ceramic capsule to fire an SCR.
It can be obtained from Mouser Electronics the new LM290xAQ operational amplifiers from Diodes...
May 2017 - Cree's new XLamp high-power LEDs can be ordered from Mouser Electronics for maximum...
We found this circuit that warns when the gate of a house is opened in an old documentation,...