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Re: LF: Class D current spikes

from [Eric NO3M] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: Class D current spikes
From: Eric NO3M <[email protected]>
Date: Mon, 25 Feb 2019 11:13:34 -0500
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Chris, et.al.
N1BUG relayed the same information regarding the U3S and class-D amp behavior, so your observation is not a one off... 





I have a series of scope captures from my W1VD amp showing huge
voltage spikes on the FET drains at the end of WSPR and especially
OPERA TX sequences. I suspected inductance was the cause. In fact I
try not use OPERA at high power as i am pretty sure to kill a FET
after a few sessions... Oddly (although I hope msomeone more
knowlegeable has the answer), using WSPR from my U3S direct from CLK0
of  th  Si535a  or  whatever it is never causes these spikes...  Or at
least they are well contained.
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