In fact, this 1967 Electronic Design circuit generates two symmetrical ramps whose frequency depends on the values of the components used. Modern equivalent transistors can be used.
We found this relaxation circuit with diac in an opto-electronic documentation with diac....
Found in American documentation from the 90s, this circuit can be implemented with modern...
In the figure we have a very simple trigger circuit for an SCR that powers a 12 V lamp whose...