Quote:
Originally Posted by Ewhaz
Basically instead of using the optocoupler to trigger the SCR they use a neon bulb instead. As the cap reaches enough charge to jump the gap in the bulb, it triggers the SCR. The bulb acts as a spark gap.
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Indeed, and AFAIK the neon bulb conducts at about 100V and over. That's why I think the discharge voltage is higher.