Triac for relay contact protection

Sep 21, 2010 20 Replies

Sorry about the messy format! You have unscrambled it correctly, although the words "time constant 40us, 110V peak" should be in the "duration of significant coil current flow" column. I won't try and re-type it because google will probably mess it up again.

When a shunt resistor is used, the current falls exponentially, hence the use of a time constant to describe it.

I didn't measure the flyback voltage without any suppression because I didn't want to risk damaging the input stage of my digital 'scope.

John

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