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Loud pop with UCD when switching on

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ackcheng 發表於 2007-5-25 08:27:48 | 顯示全部樓層 |閱讀模式
Hi,

I am using UCD180 with coldamp PSU. I use the /on with a relay to contol standby/active. But everytime the module is wakeup from standby mode, there is a loud pop.

Anyway to avoid it?
Is it due to the imbalance of +ve and -ve rails from the coldamp PSU?

ackcheng
thomasfw 發表於 2007-5-25 15:02:38 | 顯示全部樓層
Pls see the link
http://www.hififever.com/forum/viewtopic.php?t=1214&highlight=
thomasfw 發表於 2007-5-25 15:04:56 | 顯示全部樓層
Also see this one :

http://www.hififever.com/forum/viewtopic.php?t=1213&highlight=
 樓主| ackcheng 發表於 2007-5-25 22:46:38 | 顯示全部樓層
Thanks. Turning the module off is OK. But the problem is turning it on. When /on is pull to GND, I can hear a loud "pop" 1 -2 seconds later.
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