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Old 14th March 2012, 07:33 PM   #691
redjr is offline redjr  United States
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Thanks pacific. You confirmed what I've always known to be true. There's so much confusing talk here sometimes, it's hard to separate what is best practice. You've cleared it up nicely for me.
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Old 15th March 2012, 10:38 AM   #692
AndrewT is offline AndrewT  Scotland
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The Audio Ground is completely different from the Protective Earth (PE)

The PE MUST be permanently connected to the chassis. This is not optional.

Keep those three statements in mind and go back through your literature and separate the wheat from the chaff. It should all sort itself into two categories:
a.) Follow this tip/advice.
b.) Ignore this nonsense.

Have you read my "test" of the Disconnecting Network?
__________________
regards Andrew T.
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Old 17th March 2012, 02:25 AM   #693
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the guide seems to be down. I'm new here, total beginner, and i want to learn more about these amps. Anybody know where i can find a copy of this guide?
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Old 19th March 2012, 04:23 PM   #694
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alh081

Try here Building a Gainclone chip amp power supply.

Could a moderator edit the dead link in the first post of the thread please?

John
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Old 21st March 2012, 03:15 PM   #695
redjr is offline redjr  United States
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Quote:
Originally Posted by ! View Post
...When power is turned on, measure the voltage between the non-joined ends of the secondary windings and compare to the voltage between either non-joined end and the joined portion in the middle. Voltage between the non-joined ends should be double the voltage between either end and the joined center tap.

If you join the wrong end of the secondary together the voltage of one will cancel out the other...
Hey ! - Thanks or this reminder. I was testing a small r-core tranny that had 2 sec windings with no diagram, or color-coding to distinguish the sides of each winding. I needed to tie them together in serial fashion to get a CT arrangement. At first I was getting my two half voltages of 19vac, but across each non-joined end I was getting zero. I changed the leads and voila. I got my double voltage of 38vac. I had forgotten that out of phase will cancel the voltage. Maybe it doesn't matter if all you will be using is the CT configuration. It's to bad there is not some industry standard diagrams and markings that clearly denote to the user how the tranny is wound - and meaningful color-coding. I can imagine many trannies with 2 secondary windings being used in CT situations. It's easy enough to test for, but still the newbie may be confused.
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Old 26th March 2012, 11:46 PM   #696
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Hi there,

What's the difference in sound between Carlos's regulated and unregulated versions regarding the lm3886 ?

I read somewhere, that regulated version, somehow, produce lifeless sound . I'm not really sure of that.

Anyway , I want to build one of the them as my first GC psu , but really hesitated which of them I should build. Any advice ?
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Old 29th March 2012, 04:20 PM   #697
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MrAdel1984

I would suggest to start with the simplest unregulated and listen to that for a bit as you build the more complex version. You can decide which suits your ears best once you have lived with them for a while.

If it is a first build keep it simple for a better chance of first time success and use a lightbulb tester to power it up.

John
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Old 31st March 2012, 03:28 AM   #698
sofus79 is offline sofus79  Denmark
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i am new here is a chip amp a direct digital amp?
and where is you thread where i can read about it
thanks for the help
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Old 18th April 2012, 12:52 AM   #699
3n2323 is offline 3n2323  United States
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Quote:
Originally Posted by john blackburn View Post
alh081

Try here Building a Gainclone chip amp power supply.

Could a moderator edit the dead link in the first post of the thread please?

John
thank you John for the link!
i was disappointed by the dead link, but hey here's the live one!
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Old 19th April 2012, 12:39 AM   #700
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3n2323

No worries, hopefully a moderator will pass by and amend the dead link soon.

John
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