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Simple High Performance DC Coupled Class A HPA with sub PPM THD
Simple High Performance DC Coupled Class A HPA with sub PPM THD
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Old 18th October 2018, 02:10 PM   #291
avtech23 is offline avtech23  Australia
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
Quote:
Originally Posted by xrk971 View Post
Hi Avtech,
Your board will go out tomorrow to Oz.
Thanks,
X
Boards received, thanks!
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Old 18th October 2018, 03:25 PM   #292
xrk971 is offline xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
Thanks for letting me know - did that really take a month to get to OZ?
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Old 18th October 2018, 10:33 PM   #293
avtech23 is offline avtech23  Australia
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
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Originally Posted by xrk971 View Post
Thanks for letting me know - did that really take a month to get to OZ?
I was interstate for a couple of weeks, so I think it only took about a fortnight in the end.
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Old 20th October 2018, 02:10 AM   #294
xrk971 is offline xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
Another option for a power supply for this amp if one wanted to use a linear supply would be the new Mark Johnson/Gtose cap multiplier. Beautiful layout by Prasi. This cap mx board has advantage that there is a pot to adjust dropout voltage from 1.3v and up to about 2-3v. So one could set perfectly balanced upper and lower rails at +/-18v.

Juma's Easy-Peasy Capacitance Multiplier

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Old 24th October 2018, 02:59 AM   #295
yourownbuzz is offline yourownbuzz
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from a quick look at the thread it looks like it needs both + & - inputs....or does this board also split single rail to dual rail?
it does look pretty impressive and imposing though
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Old 24th October 2018, 07:09 AM   #296
xrk971 is offline xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
Thatís a dual rail cap Mx board. Prasi just made me a smaller layout of a version of this board using SMT components and TO220 BJTs and an on board rectifier bridge to make lower current (1A and under) dual rail output.
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Old 24th October 2018, 07:17 AM   #297
ernesternest is offline ernesternest  Europe
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Old 5th November 2018, 09:09 AM   #298
yourownbuzz is offline yourownbuzz
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finally ordered the parts for the amp ! got the meanwell power converter instead, for anyone thinking about getting it - its much larger and no way of fitting on the pcb

X:
with heatsinking of the mosfets, would the same ones you used for the power regs be fine? or does it need something beefier ? (I seem to remember you hooking it up to a pretty big heatsink with CPU fans...or was that another thread?)
heatsink on power regs as in this post - Simple High Performance DC Coupled Class A HPA with sub PPM THD
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Old 5th November 2018, 04:02 PM   #299
xrk971 is offline xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
That was another thread. This amp works fine if you simply use the baseplate of the amp as a heatsink. 18v x 125mA is about 2w per MOSFET so 8w total.
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