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Old 26th January 2013, 09:10 AM   #1261
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Nicely Keith, post some pics once she's up and running.
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hoping to pick up some things.
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Old 26th January 2013, 11:55 AM   #1262
Marra is offline Marra  United Kingdom
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We have music with no hum but terrible hisssss
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Old 26th January 2013, 12:11 PM   #1263
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Marra View Post
We have music with no hum but terrible hisssss
You need to check the PSU for oscillations (you need a 100Mhz scope for that).
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Old 26th January 2013, 12:17 PM   #1264
Marra is offline Marra  United Kingdom
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Thanks Frans I will get a friend to check things for me when he rescues his test gear from the loft. Impatience got the better of me.
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Old 26th January 2013, 01:23 PM   #1265
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Just add the comp caps underneath, you lose nothing.
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Old 26th January 2013, 02:33 PM   #1266
Marra is offline Marra  United Kingdom
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Just done that Simon and fluctuations seem reduced.I'm just about to plug it into the system;fingers crossed.
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Old 26th January 2013, 03:01 PM   #1267
Marra is offline Marra  United Kingdom
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Hiss is now gone and we have good sound with a slight hum.I have used a basic p/s for the moment.The better ones will be implemented when I make more space on the shelf.I like what I hear so far.
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Old 26th January 2013, 04:09 PM   #1268
PMA is offline PMA  Europe
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Guys the compensation caps are an absolute necessity in that Paradise PSU!! Those who seemingly have no issues have them hidden. The design is unstable without caps.
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Old 26th January 2013, 04:57 PM   #1269
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another one is up and running ; )
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thanks to all for circuitdesign-, pcb-making, partsdistribution helpdesking around and so on.

stefan
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Old 26th January 2013, 05:09 PM   #1270
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currently im adding a million solderpoints in the signalpath for a input imp. switch..

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