This configuration was found in an American publication from the 90s. Operators admit equivalents just like transistors. The circuit does not require a symmetrical source.
When the temperature rises above the value adjusted by P1 the relay triggers on. The rated voltage for the...
This oscillator for frequencies up to a few tens of kilohertz was found in a 1970s documentation. The...
This small transmitter, found in a 1982 publication, sends its signals to an FM receiver placed...