Found elsewhere in this section, this circuit mimics the noise of a steam locomotive. This was obtained from an Electronics Today International of the 1980s.
This configuration was found in an English magazine from 1965. It is valid for any junction FET. The...
Operated directly from the power grid, this detector was found in an 80's RCA documentation. The sensor is...
This circuit can control the power from 0 to 70% of the maximum power on a load. The circuit was...