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Old 9th January 2005, 06:47 PM   #1
roger-k is offline roger-k  Norway
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Default The Leach Amp - Power supply?

My Leach Amp are soon finished (2x120W)
I wonder if there is any profit, to use two rectifiers (one for each channel) and four capacitor (two for each channel).

Is there some who have some experience with this?

Best regard
Roger
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Old 9th January 2005, 07:01 PM   #2
roger-k is offline roger-k  Norway
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I use one transformer.
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Old 9th January 2005, 07:19 PM   #3
Cobra2 is offline Cobra2  Norway
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Default Please read...!

http://www.tnt-audio.com/clinica/ssps1_e.html

Arne K
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Old 9th January 2005, 07:34 PM   #4
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I built mine as a dual-mono chassis with completely
independent power supplies. I like to think it improves
power supply regulation and crosstalk. At the time
I was able to pick up a batch of 30,000 uF @ 60V caps
and used four on each channel for a total of a quarter-
farad(!).

I did find it necessary to improvise an inrush current
limiter.

My Ultimate Leach Amplifier might use >four< independent
power supplies, one for each supply rail and each channel.
And I used the leftover parts from my first project and
upgrades to build a backup amplifier with the power
supply done exactly as you want to do. Works fine.

The more the merrier, at least up to a practical point.
If you've got the parts, use 'em.
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Old 9th January 2005, 07:39 PM   #5
roger-k is offline roger-k  Norway
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I have read it.
There is a lot of useful information there.

Thank you very much!, for the help.
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Old 9th January 2005, 08:07 PM   #6
jaycee is offline jaycee  United Kingdom
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Leach's own version of the amplifier uses exactly the configuration you mention. One transformer but one rectifier per channel and one set of smoothing caps per channel.
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Old 9th January 2005, 08:27 PM   #7
roger-k is offline roger-k  Norway
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Damon Hill:
With all these big cap. I realy think your amp sounds very good!

jaycee:
I know that, but as everybody else I want to make the optimal amplifier.
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Old 9th January 2005, 08:41 PM   #8
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Why is it called Leach ?
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Old 9th January 2005, 08:49 PM   #9
Quattor is offline Quattor  France
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Go figure...

http://users.ece.gatech.edu/~mleach/

http://users.ece.gatech.edu/~mleach/lowtim

http://users.ece.gatech.edu/~mleach/superamp

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Old 10th January 2005, 08:41 AM   #10
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Question HT-Configuration - same question

I'm currently designing a HT-Amp, based on the Opti-MOS amp and
I'm wondering what is the best configuration for the power supply, too.

I have two really huge torodial transformers, 1200VA each, center tapped,
so one would be surely enough for 5 (maybe 6) channels with a more
conservative design.

But how to configure the power-supply?
My current plan is to use only one transformer, one rectifier, 80.000uF shared
cap and another 20.000uF on eachs channels pcb.
Another solution would be to use one transformer, with dedicated rectifiers
and 40.000uF for each channel. Low crosstalk but low capacity for each channel.

Or should I really use both transformers and use two independant
power-supplies, one for stereo-L/R and another one for the surround
channels, with the added benefit that I can switch off the surround channels
in stereo mode?
Or maybe use two PS and divide them Left-Front/Rear + Center-F and
Right-Front/Rear + Center-B to minimize L/R-crosstalk in stereo??

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