Dual polarity power supply.

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pre65
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#16

Post by pre65 »

Nick wrote:
pre65 wrote:Looks like I will be using two separate regulators linked together now, because the current limit of my previous suggestion is not quite enough.

Ray P is helping me by supplying the PCBs I need.

Thanks Ray.:)
If its for a power amp, I would use a couple of mosfet followers and a lot of caps. Have a look at some of the pass labs power supplies.
/quote]

I found this on Ebay but the description is a bit confusing. :oops:

http://www.ebay.co.uk/itm/191095136158?
_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Is it a mosfet follower ?
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Nick
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#17

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Doubt it, sounds like there is a op amp in there.
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pre65
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#18

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I've sent the supplier a message asking him to clarify the specifications of this unit.

http://www.ebay.co.uk/itm/191095136158? ... EBIDX%3AIT
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#19

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I'm finding out a bit more about regulators.

These are higher power ones more suited to amps.

http://cds.linear.com/docs/en/datasheet/108345fg.pdf
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#20

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pre65 wrote:I'm finding out a bit more about regulators.

These are higher power ones more suited to amps.

http://cds.linear.com/docs/en/datasheet/108345fg.pdf
Yes, they're the ones I suggested to you Phil.

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#21

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How's the JLH build going Phil?

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#22

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It's not !

I'm waiting for more info in the Colin Wonfor DIY class A amp first.
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#23 Re:

Post by pre65 »

Ray P wrote:BTW, a capacitance multiplier power supply is often recommended for the JLH Class A amp.

I'm back on this topic again.

Capacitance multipliers power supplies may seem to be the answer, how about this one (see Fig 3) for a dual rail class A psu.
:)

http://sound.westhost.com/project15.htm
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#24 Re: Dual polarity power supply.

Post by jack »

There was a big thread on DIYa a while back on capacitance multipliers - not very scientific but some good results.

http://www.diyaudio.com/forums/power-su ... plier.html

Simplified version: http://www.diyaudio.com/forums/power-su ... er-14.html

What really irritates me about these is that there is no real attempt to quantify what has been achieved (if anything), and the qualitative analysis is also rather light...

A simple EDN article explaining various approaches including the CM with some figures showing a 2 decade improvement in noise (uV/root hz) over a basic 317 - http://www.edn.com/Pdf/ViewPdf?contentItemId=4422750

Interesting approach though...
Last edited by jack on Mon Aug 10, 2015 4:40 pm, edited 1 time in total.
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#25 Re: Dual polarity power supply.

Post by Mike H »

Ah!! In this context capacitance multiplier = floating regulator. Is how my FET-reg module works.
 
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#26 Re: Dual polarity power supply.

Post by pre65 »

Here is another capacitance multiplier PSU, much the same as the one I linked to before.



http://electronicsforu.com/electronicsf ... 1&tt=unhot
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#27 Re: Dual polarity power supply.

Post by pre65 »

I did search (as Nick suggested) for mosfet follower and Pass amp power supplies but I could not find anything that was suited to dual rails at approx +/- 18v.
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