This series and parallel sensor circuit was found in Popular Electronics from the 1990s. Any SCR can be used and the supply voltage depends on the load.
We found this different configuration that uses a fluorescent lamp as a negative resistance device...
This circuit was obtained in an 80's Siliconix documentation. The circuit can be used as a shield,...
The purpose of this circuit is to imitate the dripping of a faucet. The circuit was found in a...