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Old 20th January 2004, 05:57 AM   #1
sonnya is offline sonnya  Denmark
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Talking I have received my new poweramp PCB!, 4layer ...

I have some PDF-files... Sorry about the messy schematic

Also there is missing the component values but they will come within a week or two.

http://mirand.dk/miranda1-comp-silk.pdf

http://mirand.dk/miranda1-sold-silk.pdf

http://mirand.dk/miranda1-sch1.pdf

http://mirand.dk/miranda1-sch2.pdf

http://mirand.dk/miranda1-sch3.pdf

And a
picture of the PCB
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Old 27th January 2004, 11:27 AM   #2
sonnya is offline sonnya  Denmark
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Hi, now i have some pics of the amp...

Click the image to open in full size.

And with a heatsink.

Click the image to open in full size.

and driving 100nF capacitive load..

Click the image to open in full size.

driving 220nF capacitive load..

Click the image to open in full size.

driving 2.2uF capacitive load..

Click the image to open in full size.

driving 4.7uF capacitive load..

Click the image to open in full size.

Slewrate is +/-120V/us.

Bandwidth without inputfilter is around 1MHz@-3dB



with filter it is 350KHz.
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Old 27th January 2004, 11:39 AM   #3
Electrons are yellow and more is better!
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Aha, Sonny, current feedback!

Sound like crap... according to some. I think it's

The amp looks like a QRV-06 deluxe . Something for Christer to simulate

Impressive results with capacitve load!!

If you don't have notice folks, Sonny has made a cool negative 431 regulator. I wonder why nobody av the semiconductor companies have shown a smiliar example because there is a need for it I 'm sure. Elegant in it's simpleness.

Very neat Sonny
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Old 27th January 2004, 01:32 PM   #4
Electrons are yellow and more is better!
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Why haven't you used any SMD plastic caps? I know that high voltage types are hard to find.

Have you got any more measurement results?

What about clipping characteristics?

I notice that you have made a not true non-inverting integrator for the DC-servo. Any particular reason to exclude the input LP-filter of the servo?
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Old 27th January 2004, 01:40 PM   #5
sonnya is offline sonnya  Denmark
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There is not that many different caps to choice between.... Thats why..

I do not have any measurements yet... Only the sim indicated a very consistend THD from 1k - 20k...

The clipping is clean and have no phase reversal.

I notice that you have made a not true non-inverting integrator for the DC-servo. Any particular reason to exclude the input LP-filter of the servo? Please explain!?
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Old 27th January 2004, 02:02 PM   #6
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Quote:
Originally posted by peranders
. Something for Christer to simulate
I thought you had got your own free LTSpice now.

BTW, don't you use Mac? Is there a Mac version or have you
changed over to PC?
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Old 27th January 2004, 02:23 PM   #7
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Sonnya,

Looks good! Did you have a resistor (8 or 4 Ohms) in parallel with those cap loads?

Jan Didden
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Old 27th January 2004, 02:26 PM   #8
hjelm is offline hjelm  Sweden
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Neat circuit with cool ideas.
Is it playing yet?

Peranders:
The missing input filter on the dc servo is that so that the OPAMP won't swing with the signal rather the low frequency part of it?
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Old 27th January 2004, 02:36 PM   #9
sonnya is offline sonnya  Denmark
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Quote:
Originally posted by janneman
Sonnya,

Looks good! Did you have a resistor (8 or 4 Ohms) in parallel with those cap loads?

Jan Didden
No it is a pure capacitive load.


Quote:
Originally posted by hjelm
Neat circuit with cool ideas.
Is it playing yet?
Yes it is playing at home...

It is very detailed. And it does not favour any range of the audioband.
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Old 27th January 2004, 03:00 PM   #10
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..and where can i buy PCB:s...??!
rather interesting circuit you have made, are you planning to sell any boards for the DIY-market?
it would be interesting to make a PCB with no plated-through holes, just using glue or doublesided tape to attach it to the cooler, makes building compact, and of course your construction with SMD also results in shortest possible signalpath.. 8-)
-truly nice work!
/Ludvig.
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