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Class D Switching Power Amplifiers and Power D/A conversion

Thump on TA2020
Thump on TA2020
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Old 8th November 2012, 08:02 AM   #1
Xerxes75 is offline Xerxes75  Netherlands
diyAudio Member
Join Date: Jan 2012
Location: Leersum
Default Thump on TA2020

Recently I put together an Arjen Helder ta2020 with great result. It plays beautifull and no thump on or off.

But I could not help myself and put in a pair off Russian oil input caps (2 mfd) and a Dact CT2 for volume control. Now I have a huge thump when switching the amp on, after that it plays beautiful.

When I measure it there is as much as 200mv dc at startup which goes back to almost zero in half a minute or so. Adjusting the offset does not help to eliminate the thump.

Last edited by Xerxes75; 9th November 2012 at 03:50 PM. Reason: Making it more clear
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