We found this relaxation circuit with diac in an opto-electronic documentation with diac. Equivalent diacs can be used and the intensity and frequency of the pulses depend on the resistor and capacitor. Observe the polarity of the supply.

We found this relaxation circuit with diac in an opto-electronic documentation with diac. Equivalent diacs can be used and the intensity and frequency of the pulses depend on the resistor and capacitor. Observe the polarity of the supply.