This circuit operates at a voltage of 1.3 V from a single mercury cell. We found in an old documentation and for the components used the frequency is 500 kHz.
In the figure we have the way to make the three-phase control of a motor using opto-diacs. The circuit is...
We find this simple musical instrument in a 1977 Radio Shack documentation. The key resistors must be...
This circuit was found in General Electric documentation from 1966. The circuit is suitable for any...