Hello Paul,

Yes,  I  put  de-coupling caps on all of those, although some are tied
together, I went for over kill! Can you temporarily jury rig the driver
board  right by the FET's and then try shorter gate wires? Between the
two I hope you get a positive result!

Wednesday, April 11, 2018, 1:59:35 PM, you wrote:

> Chris,

> I think it was after looking at your driver board photos that I
> decided to order these particular caps. They look exactly like
> yours. ;-)

> I haven't tried the bypass caps yet. Given we're now testing without
> generating any RF (no drain voltage on the FETs) I'm a bit dubious
> but I will try them. It's four caps, right? Pin 14 of the 74F74 to
> ground, pins 9, 3, and 6 of the IR2210 to ground.

> The other day Jay asked about power to the IR2110 and trace
> thickness... which might affect drive to the FETs but probably not
> the timing issue we're now chasing. However, for sake of
> completeness in this thread it's a 25 amp supply!!! through 3 feet
> of #18 wire to the board. The weakest link is about 3 inches of #22
> wire from the board +12V input terminal to pins 3 and 6 of the
> IR2110. Anticipating a possible question... no it's not the same
> supply I'm using for the FET drains, just a spare bench supply that
> was conveniently located for testing.

> Paul




-- 
Best regards,
 Chris                            mailto:[email protected]