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Old 29th June 2013, 06:26 AM   #2281
Salas is online now Salas  Greece
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Yes its a good order if practical.
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Old 4th July 2013, 04:58 AM   #2282
nezbleu is offline nezbleu  Canada
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Default Still almost there

After many delays, this project advances. For no particular reason I wanted to balance the +/- CCS currents. To do this I ended up with CCS resistors of 5R||15R on the positive rail, and 5R||8R2||15R on the negative rail, which looks insane, but got me about 280mA per rail (as I recall).

This is to power an opamp-based phono board, I thought I had everything measured, but bought an enclosure that is barely big enough. In fact I filed away about a mm of the phono circuit board to cram it in. Plus the enclosure has ridges on the inside bottom (and top) which interfered with the mosfets, so I used a rotary (Dremel-like) tool to grind away some of the ridge to make things fit. It fits better than it looks.

Here are some photos.

DSC_4194.JPG
You can see the ridge on the bottom I had to grind away.

DSC_4201.JPG
The nasty looking bottom and the paralleled positive rail CCS resistors. At 10W each they should never get warm.

DSC_4205.JPG
Here are the stacked 10W resistors on the negative rail.

DSC_4207.JPG
You can see it's a tight fit!

DSC_4209.JPG
I had to offset the boards vertically so I could overlap them horizontally, which made fitting connectors on the end panel a little more challenging.

DSC_4211.JPG
The overlap may be a little clearer. Incidentally, I left the MOSFET leads untrimmed in case I needed to adjust the board height. Now that everything fits (barely) I will trim them short. The electrolytic caps are just making contact with the inside of the top cover, so I may grind away parts of the ridges there as well, to provide better air circulation. I'm thinking I may also add a dab of hot glue between those caps to hold them steadier.

Now to wire it all up!
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Old 4th July 2013, 07:26 AM   #2283
Salas is online now Salas  Greece
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Detailed work that takes patience. Looking good.
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Old 8th July 2013, 11:44 AM   #2284
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Hi, do you need isolators between the mosfets and heatsinks?
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Old 8th July 2013, 11:47 AM   #2285
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Quote:
Originally Posted by merlin2069er View Post
Hi, do you need isolators between the mosfets and heatsinks?
YES
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Old 8th July 2013, 11:55 AM   #2286
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Check "no continuity" with the DVM
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Old 8th July 2013, 12:14 PM   #2287
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ok, not needed.
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Old 8th July 2013, 12:15 PM   #2288
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I've got a matched pair of 170's.

Where would I actually use these in the shunt? There are 3 spots for 170's on board.
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Old 8th July 2013, 02:44 PM   #2289
AndrewT is offline AndrewT  Scotland
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Save them for a proper job that needs matched pair.

A regulator does not even need accurately selected Idss and certainly not matched pairs.
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Old 8th July 2013, 05:07 PM   #2290
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lol, damn. Maybe I should return them.
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