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Old 26th August 2006, 12:53 PM   #1
triast is offline triast  Indonesia
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Unhappy how to Using single secondaries transformer for snubber psu

Dear All,


Please someone explain how to do wiring If I use 2 single secondaries transformer ( 0v and 24v) on snubberized psu.
I am really confused ...
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Old 26th August 2006, 02:05 PM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
is that two secondaries on one transformer?

or

two transformers each with a single secondary?
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Old 27th August 2006, 11:54 AM   #3
AndrewT is offline AndrewT  Scotland
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Hello,
have you gone to sleep or AWOL?
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Old 27th August 2006, 08:23 PM   #4
triast is offline triast  Indonesia
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two transformers with single secondaries,
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Old 28th August 2006, 07:53 AM   #5
AndrewT is offline AndrewT  Scotland
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Hi,
yes, you can use two separate tranformers each with a single secondary.
Just wire each secondary into the ~ of the bridge rectifier.
Then connect one + of a rectifier to one - of the other rectifier.
This common connection is then taken to your audio ground. The other + and - become your PSU supply points.
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Old 30th August 2006, 04:05 AM   #6
triast is offline triast  Indonesia
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thank you
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Old 8th September 2006, 09:00 AM   #7
triast is offline triast  Indonesia
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Quote:
Originally posted by AndrewT
Hi,
yes, you can use two separate tranformers each with a single secondary.
Just wire each secondary into the ~ of the bridge rectifier.
Then connect one + of a rectifier to one - of the other rectifier.
This common connection is then taken to your audio ground. The other + and - become your PSU supply points.
I still confuse, look at this diagram below, it's a sch of chipamp.com lm3886 psu:
Click the image to open in full size.

All output voltages (v+ and V-) are from "+" of the bridge. And the PG+ and PG- are from "-" of the bridge.
Is this correct?

It's different if compared to the original carlos snubberised psu, because the "v+ conected with "+" of the bridge, and the V- conected with "-" of the bridge. Also with the PG+ and PG- are connected as the same way. The diagram :

Click the image to open in full size.

Also can compared to Mick Feuerbacher (dogbreath.de) psu:

Click the image to open in full size.

So somebody could explain this matter to me please?
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Old 8th September 2006, 12:01 PM   #8
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I think it can safely be said that the schematic at chipamp.com suffers from an attack of the cut-and-paste disease.

Rune
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Old 9th September 2006, 02:42 AM   #9
triast is offline triast  Indonesia
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I also find this sch on his website:

Click the image to open in full size.

So which one is correct?

above sch or this one:

Click the image to open in full size.
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Old 9th September 2006, 10:55 AM   #10
AndrewT is offline AndrewT  Scotland
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Hi,
post 7
1st schematic.
Top half OK.
Bottom half bridge reversed.

2nd & 3rd schematics are OK.

Post9
1st schematic OK.
2nd top half OK.
Bottom half reversed bridge.

However ALL the diagrams need further work on the grounding.

They all show the power 0V feed from the end of a string of connections going to the amplifier. This is inviting trouble.

The transformer to rectifier loop should be short and compact.
The rectifier to smoothing cap loop should be short and compact.
The 0V common should be connectted to either the + & - of the rectifiers or to the + & - of the first smoothing caps. A link from this 0Vcommon line should then go to the audio ground.
The amplifier should get it's 0V power connection from the audio ground NOT from the string of connections remote from the 0V common point.
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