Someone else was going to do that too, and I am supposed to build one for a local friend as a lower current fixed voltage version. Fortunately, MrEvil has made that easier for us... see Post 186.
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Does this version incorporate the changes here?
http://www.diyaudio.com/forums/power-supplies/51817-improving-capacitance-multiplier.html
http://www.diyaudio.com/forums/power-supplies/51817-improving-capacitance-multiplier.html
Yes, this is the implementation of the ideas from that thread. I should have attached the schematic to the original post to make that clearer.
Maybe a mod would be so kind as to attach the following attachments to to it?
Attachments
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Schematic and BOM
Design Changes: Link above was my original post where the design details were presented, comments in post after that refer to this version. This was modified a bit for higher voltage rails, and for a larger output cap to suit the needs of a class A-B amplifier up to about 100W per channel. So, strictly speaking, a small modification of MrEvil's design after the changes referred to in the above post.
(More power or class A may require larger heatsinks for the pass transistor, as shown in a later post, and also in version designed by Idefixes.)
Orders: I did not anticipate as much interest, frankly. First I was surprised that there was so little interest in MrEvil's original thread. Then it built very quickly, so I was surprised again. I was originally planning on perhaps a dozen sets of boards, the order quantity was increased twice, and we are close to have to place another order.
Construction: I will repost all of the information, with as many details as I have. I am also working on a short build guide.
Errata: In the original BOM, values of R11 and R12 were not yet changed from the original 100R to the 470R to be used with the J112 Jfet. This resistor value should be adjusted if using a different jfet.
The problem which led to two drill sizes defaulting to the smallest tool has been corrected by the board house.
Rev B of the board, which is shipping now (names on the list) has been modified to include the hole pattern which accommodates both screw terminals and Faston connectors.
Attachments
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Scaled, yes. Easily, I am not sure. That may also depend on your tolerance for higher component cost.
Past 100W into 4 Ohm load should not be a problem with some care. Past 100W into 8 Ohm load generally requires rail voltages over 55V. This requires operating the pass transistor past its maximum voltage at startup, or a different transistor with higher breakdown voltage spec. In other words, the main issue is the maximum power supply voltage required for an amplifier, not so much the maximum peak power.
Andrew: I am being encouraged to just start a thread in the Group Buy forum, and once I do that, I can keep the documents updated in the first post there.
We can still have the technical discussion here, and the other thread will be mostly for the orders and documents. That is what I am hoping, at least.
Then we can also get back to Marc's version, which may be the preferred one for people etching their own boards.
Yes, if I understand the question. No configuration needed, there will just be an un-used Faston connector on the board.
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