This telephone circuit was found on a 90's EDN. It keeps a flashing LED to indicate that there was a call in your absence. The components admit equivalents.
This operational filter configuration was obtained in a 1980s publication. The calculation is made by the...
The sensor in this simple circuit is a NTC (Negative Temperature Coefficient) resistor. NTCs with...
This circuit is from a high voltage tube source. It does not include the filament voltage that must...