Re: LF: W1VD amp help - IR2110 and timing

[N1BUG <paul@n1bug.com>]

OK, let's switch topics a bit.

I have a serious drain circuit ringing problem that most builders
apparently don't have. Many things change all but the first peak of
the ringing, but that first one is stubborn. It almost seems like
that first big peak is being "forced" to occur somehow.

I believe someone mentioned, though I cannot find it now, that cross
conduction (one phase starting to switch on before the other is
completely off) would exaggerate ringing.

I've become curious as to whether the timing in my amp is correct.
No one has really commented on this aspect. My driver board is
unique and it would not be at all surprising it it has stray
capacitance in excess of most!

Here are the two gate waveforms overlaid so you can see the crossing:

http://www.n1bug.com/gates4-wdv13.jpg

And here are the drains similarly overlaid to show the crossing:

http://www.n1bug.com/drains2-wdv13.jpg

*Is* this OK or could the timing be just a bit off? I lack the
knowledge to interpret what I am looking at.

*If* it could possibly stand some improvement, do I have control
over it? I think the 1000pf caps and 15k resistors on the IR2110
inputs would affect this timing but I haven't been able to work out
exactly how or what to change if I wanted to experiment:

http://w1vd.com/137-500-KWRev3.0.pdf

Paul