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Old 8th December 2008, 06:26 AM   #521
steenoe is offline steenoe  Denmark
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The idea behind and only purpose of the prereg is to dispose any excessive voltage. An example could be if one wanted to install a buffer into an amp with 55V rails, then this is possible with the newly added preregulator. Another example is if one has a trafo with a too high secondary voltage, then this can be put to use , because of the prereg. The Toolereg alone would probably not be well, disposing eg 30V alone With a helping hand from the prereg, everything is fine. Flexibility.
There is no real need for elaborating (making it more complicated) on the prereg. It is just meant as a handy tool in case of excessive voltage.
You will be perfectly fine, leaving it off alltogether, in most cases.

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Old 9th December 2008, 09:52 PM   #522
Salas is offline Salas  Greece
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Why not to dispose excessive voltage on a series resistor feeding a capacitor, so to pre filter it as well? Why wrap an open loop design in a high feedback feeder IC? Those things are in series impedance with the audio signal via AC ground.
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Old 9th December 2008, 10:56 PM   #523
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Hi Salas,

Good points you have there, This project has been a Universal sort of regulator so the raw supply has the ability to bypass the prereg and keep it the way it was as a CLC filter so nothing has been lost squeezing in the LM’s reg; this also allows anyone to use these supplies for a different purpose.

Still pending my 6V6 lineamp, hope to build it this coming month,

Cheers, Tony
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Old 9th December 2008, 11:07 PM   #524
Salas is offline Salas  Greece
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Hi Tony,

I am set to experiment for the simplest possible no feedback high voltage ccs'ed shunt with easy to get components, for that 6V6. If it will work in practice, I hope that it will beat the Maida Mosfet 317 one that I use now. And it will be a universal HV PSU weapon if successful.
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Old 12th December 2008, 11:32 AM   #525
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Default Trafo for NS10

Somebody please

I planning to use this R-core trafo from diyclubbiz. It has 2 x 0-24V seccondaries and will feed through "raw supply" + Toolereg boards.

Is that OK?. Thanks for help

R-26-51 R-core

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Old 12th December 2008, 04:22 PM   #526
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Worked for a Lux C-05, so why not.
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Old 12th December 2008, 09:09 PM   #527
steenoe is offline steenoe  Denmark
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Default Re: Trafo for NS10

Quote:
Originally posted by JC Fardo
Somebody please

I planning to use this R-core trafo from diyclubbiz. It has 2 x 0-24V seccondaries and will feed through "raw supply" + Toolereg boards.

Is that OK?. Thanks for help

R-26-51 R-core

Yes, that will work fine. Nice trafo.

Manu, your boards arrived today, taking at least 1 day longer than usual, probably because of Christmas time.

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Old 12th December 2008, 09:56 PM   #528
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Quote:
Originally posted by Manu
Last version of the Raw supply (take #2)


Manu

( Mod : could you please delete the pic from my post #514 ... as it is the wrong one ... tnx)
Hi guys, excellent work

Cosmetic nit picking only....the traces between the diodes are not symetrical and they are different from each other (and the pads may not be in the centre of the trace ???). The extra pads for the filter cap would look better if they were both on Earth.

regards
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Old 13th December 2008, 09:56 PM   #529
steenoe is offline steenoe  Denmark
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Quote:
Originally posted by Greg Erskine


Hi guys, excellent work

Cosmetic nit picking only....the traces between the diodes are not symetrical and they are different from each other (and the pads may not be in the centre of the trace ???). The extra pads for the filter cap would look better if they were both on Earth.

regards
Greg, thanks for pointing that out. I actually spotted the asymetri around the diodes, right away when I saw the board, that Manu send to me. Hadn't really noticed before. Lets see if there is more, when the boards are being built, so Manu can do a final "facelift" before sending any Gerbers out of the house

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Old 15th December 2008, 10:22 PM   #530
Manu is offline Manu  Europe
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Quote:
Originally posted by steenoe


so Manu can do a final "facelift" before sending any Gerbers out of the house


Certainly

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