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Old 27th January 2009, 01:26 AM   #111
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Okay so I have the primaries resolved, and am getting 24v per sec.

24 x 1.4=33.6

I'm getting about 66v across the amp boards.

So... 66/2=33

It appears to be bridging the two DC supplies... why?!!?!?
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Old 27th January 2009, 07:02 AM   #112
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Quote:
Originally posted by Nuuk
Richard, my (clear) preference is for the Pedja Rogic discrete regulated supply for the GC! And I reckon 10,000uF is enough for a GC but as ever, I won't discourage responsible experimentation!

Quote:
Originally posted by Nuuk


I do one day but I don't have the time right now. IF I can find time to take a photo of mine I will do that. It's a fairly simple circuit and shouldn't present any problems.

Alternatively, see if you can get PCB's from Pedja at Audial for his regulated PSU.

So the supply you built for your 1543 wasn't Pedja's discrete, it was based on LM317/337?
It was based on Pedja's standard regulated ps using just a LM317.
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Old 27th January 2009, 08:37 AM   #113
AndrewT is offline AndrewT  Scotland
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Hi Ray,
you've got a dual polarity supply from dual secondary transformer.
Middle connection is treated as zero volts.
The other two connections from the PSU are +33Vdc and -33Vdc.
All normal for this 24Vac transformer.
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Old 27th January 2009, 08:51 AM   #114
Nuuk is offline Nuuk  United Kingdom
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Quote:
It was based on Pedja's standard regulated ps using just a LM317.
OK, I didn't know he had done one of those!
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Old 27th January 2009, 03:13 PM   #115
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Okay audio1st I owe you a coke.


Now I think my secondaries are incorrect. Are they??
Hi Ray,
It looks as if you have 2 white wires at V- and 2 red wires at V+..
I cant see where PG- and PG+ are connected, have you just tied them together?
They need to connect to the AMP board ground..
Please let us know how you have connected these wires.
Barry..
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Old 27th January 2009, 04:37 PM   #116
grenert is offline grenert  United States
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Quote:
Originally posted by jackinnj
If anyone cares, I am going to have some boards burned which will approximate what National describes in application note 1849 -- only thing is that I prefer MUR860's to bridge rectifiers and a pants-n-suspenders approach to snubbers -- with TH's setup you have the provision for slow-start and mute etc. There'll also be a provision for auxiliary power for a buffer etc.:

http://www.national.com/an/AN/AN-1849.pdf
Please let us know when the board is available, and thanks for the link . Given the transformer-specific math that goes into determining snubber values, do you think the National's default values could potentially do more harm than good? Also, what do you think of the CarlosFM-like psedo-snubbers they have after the filters?
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Old 27th January 2009, 05:31 PM   #117
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Quote:
Originally posted by Nuuk


OK, I didn't know he had done one of those!

You must have missed that one
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Old 27th January 2009, 06:23 PM   #118
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Nick

Did you build the first or second discrete circuit?

http://myweb.tiscali.co.uk/nuukspot/...p/supplies.htm
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Old 27th January 2009, 07:13 PM   #119
Nuuk is offline Nuuk  United Kingdom
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Quote:
Originally posted by Tripmaster
Nick

Did you build the first or second discrete circuit?

http://myweb.tiscali.co.uk/nuukspot/...p/supplies.htm
Both.
(Technically the first isn't discrete - ie it uses the LM338 regulators.)
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Old 27th January 2009, 08:09 PM   #120
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Quote:
Originally posted by Nuuk


Both.
(Technically the first isn't discrete - ie it uses the LM338 regulators.)
Sorry, you misunderstood. I was referring to schematic 2 and 3.
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