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.
This circuit was found in a 1975 technical publication. The circuit can be designed with 741...
The difference between this oscillator in relation to the previous one is in the use of source...
We found this circuit in a 1969 Mullard documentation. The same configuration appears elsewhere in...