|4th July 2013, 05:58 AM||#2282|
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.
You can see the ridge on the bottom I had to grind away.
The nasty looking bottom and the paralleled positive rail CCS resistors. At 10W each they should never get warm.
Here are the stacked 10W resistors on the negative rail.
You can see it's a tight fit!
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.
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!
|8th July 2013, 03:44 PM||#2289|
Join Date: Jul 2004
Location: Scottish Borders
Save them for a proper job that needs matched pair.
A regulator does not even need accurately selected Idss and certainly not matched pairs.
regards Andrew T.
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