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Old 8th July 2013, 04:57 AM   #1701
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radioFlash,I like it nice layout
Can you provide the possibility to use the MPC emiter resistors?

Last edited by meanman1964; 8th July 2013 at 05:02 AM.
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Old 9th July 2013, 12:34 AM   #1702
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Originally Posted by meanman1964 View Post
radioFlash,I like it nice layout
Can you provide the possibility to use the MPC emiter resistors?
Thanks. Here's a version that would support an MPC resistor with 10mm lead spacing. It's based on the footprint of the TE Connectivty resistor
(HPR5RSR47J Product Details - TE).
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Old 9th July 2013, 04:34 AM   #1703
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Nice,that's what I mean.What software do you use?
I wonder, if it's not better to put a resistor between the two psu caps to reduce the charging current?
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Old 9th July 2013, 04:09 PM   #1704
Vostro is online now Vostro  South Africa
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Putting a resistor in parallel with capacitor will limit charging current ?
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Old 9th July 2013, 04:37 PM   #1705
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No not parallel in serie between the two positive and the two negative poles.The voltage goes into the first cap then trough the resistor into the second cap.Positive and negative pole each there own resistor something like you see in the pic
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Old 9th July 2013, 05:18 PM   #1706
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What purpose ...?
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Old 10th July 2013, 12:25 AM   #1707
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Hello everyone,

I am considering building this for my next power amp project. I have a recent thread on here detailing my ESP P3A build, which I am very happy with, but would like to try something more powerful this time. A few questions:

- Where can I buy PCBs from? Jim's Audio has supposedly "official" boards for sale and they seem to be of high quality. He seems to have get a bad rap here though. I have sent alex mm a message and await his reply.

- What is the best way to source matched output transistors? I can buy a roll each of 3281A/1302A and match them myself. But it is expensive to buy 50 transistors when I only require 20.

- Would two heatsinks (one per channel) be sufficient for this amplifier? Each heat sink is 300x75mm with 48mm deep fins and a thermal resistance of 0.37 C/W. I used only one of this same heatsink for stereo P3A build and it barely gets warm and normal volumes. If this is inadequate, would a 300x151mm and 0.25 C/W heat sink suffice?

- What transformer would you recommend? I was thinking of either 2x 300VA or 1x 500VA toroidal. I'll only be driving 4-8 ohm speakers and don't require 2 ohm stability. 200W @ 8 ohm or around 300W @ 4 ohm is my target.

- I see that each board has space for 2x 10,000uF / 100V filter caps (40,000uF in total). Is there any benefit to mounting the filter caps separately, or having a bank of "prefilter" caps as well?

Last edited by Ranchu32; 10th July 2013 at 12:33 AM.
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Old 10th July 2013, 04:38 AM   #1708
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I've done a groupsbuy of this amp together with Byronlawrence and Alex did the layout.I realy like the layout from radioFlash.Maybe there is a new groupsbuy coming up with this layout.
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Old 10th July 2013, 04:44 AM   #1709
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What purpose ...?
Fitter maybe,me personal don't like those big caps direct on the boards due the charging currents,I could be wrong.
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Old 10th July 2013, 06:54 AM   #1710
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If anyone knows of a group buy or has a couple of boards they want to sell, could you please contact me? Alex mm replied saying he has no boards so my only option is Jim thus far.
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