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Old 26th April 2012, 01:32 PM   #1331
Tea-Bag is offline Tea-Bag  United States
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Have any of the beta-testers for ToeCutter V3 boards got there stuff up and running at higher than 32 Volts yet?

I want to compare notes on or off this list.
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Old 27th April 2012, 09:35 PM   #1332
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Yes, Progress report guys ....
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Old 27th April 2012, 09:41 PM   #1333
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not yet. i'm going to run mine at +/-42-45V but its not ready until late this summer.
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Old 28th April 2012, 04:27 PM   #1334
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Gentlemen,

Just to let you know, I've been working on a redesign of the boards with Variac that meet diyAudio's USM.
The mounting holes for the input stage and PSU have been modified to match the perforated bottom plate of the pre-drilled case that will be available.

In addition, the PSU now has large screw terminals and accomodates 40mm & 45mm snap-in capacitors.

The Input stage is a single board with a score line for SE and a jumper link for balanced.

Images are posted below.

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Power Supply

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Input Stage

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P Channel O/P Board

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N Channel O/P Board
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Old 28th April 2012, 04:48 PM   #1335
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UKToecutter-
I am concerned that the diode sharing the same heatsink in power supplies may be inadequate. I use 4 of them on a 2A current at 24V 2" Each BrianGT board, and they still run really hot.
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Old 28th April 2012, 04:58 PM   #1336
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Tea-Bag, what is the size of your heatsinks? Just curious, wondering if there is anything commonly available that is bigger.

I have bought some TO-220 heatsinks recently and they only seem to go to about ~60mm tall.
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Old 28th April 2012, 05:05 PM   #1337
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The diodes can still pass 15A at 150C according to the datasheet. They can get hotter than the fets and still operate well. I think it slows them down some, but whether this affects performance in any significant way is unknown.
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Old 28th April 2012, 05:10 PM   #1338
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My sinks don't have as large of a wing profile as the one's here, but 2" (~50mm) and one for each diode. It is only a concern. I cannot say with any certainty that it will become a problem. If the beta-testers could tell us about the sink temp under load - that would be most helpful.
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Old 28th April 2012, 05:21 PM   #1339
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I think it's a good bet that any F5T will need to be in a chassis that is not only adequately heatsinked, but a well-ventilated inner case as well.

Or, we could always just use the 200V 35A bridges that have been the staple of the "Pass/Zen/Firstwatt Vernacular" style of PSU. They work.

That said, I really want to see the PSU be easily usable as designed.
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Old 28th April 2012, 05:34 PM   #1340
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I would be interested in more feedback from the prototype builders in regards to the PSU.
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