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RMI-FC100, a single stage audio power amplifier
RMI-FC100, a single stage audio power amplifier
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Old 31st December 2008, 03:38 PM   #531
ernesternest is offline ernesternest  Europe
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Default BG Thread

Hi guys,

yepp - not cheap

Would you mind posting all GB - activities in the GB thead? I'm sure there are some people interested in transformes, myself included!!!!

Thanks and a HAPPY NEW YEAR

cheers Ernst
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Old 31st December 2008, 03:42 PM   #532
Sheldon is offline Sheldon  United States
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Yes, I should note that the $350 was just to mostly stuff the boards. So about $100 per channel to stuff with good components.

Sheldon
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Old 1st January 2009, 05:22 PM   #533
pooge is offline pooge  United States
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Roender,

It appears you've replaced all the capacitors in the middle of the board in post 353 vs. the ones in the original BOM and the picture in post 99.

You only mentioned the change to C1 as being an improvement. How did the change to the others affect anything, if any? What parts did you use in the changes?

Did you change any in the power supply board?
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Old 1st January 2009, 07:40 PM   #534
roender is offline roender  Romania
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Quote:
Originally posted by pooge
Roender,

It appears you've replaced all the capacitors in the middle of the board in post 353 vs. the ones in the original BOM and the picture in post 99.

You only mentioned the change to C1 as being an improvement. How did the change to the others affect anything, if any? What parts did you use in the changes?

Did you change any in the power supply board?
Keep the recommended changes, only C1 plus some small series resistor. I did a lot of experiments in order to find a lucky cap combination ... so I've spend a lot of money almost for nothing and I succeed to destroy a some boards by desoldering and resoldering components .
The only caps, besides C1, which might probably worth to be changed are in power supply (MUSE KG)
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Old 2nd January 2009, 02:17 PM   #535
pooge is offline pooge  United States
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Muse KG are too large, and won't physically fit on board unless smaller value is used and made up with off-board caps.

How many turns for L1?
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Old 2nd January 2009, 02:31 PM   #536
roender is offline roender  Romania
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Quote:
Originally posted by pooge
Muse KG are too large, and won't physically fit on board unless smaller value is used and made up with off-board caps.

How many turns for L1?
Muse KG, 10.000uF, 50V, 30x45mm will fit perfectly into boards.
I never use L1. If you think you need one, 1.5mm coper enameled wire, 10turns on 12mm diameter will suffice.
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Old 2nd January 2009, 02:35 PM   #537
housing is offline housing  Hong Kong
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Quote:
Originally posted by roender


Muse KG, 10.000uF, 50V, 30x45mm will fit perfectly into boards.
I never use L1. If you think you need one, 1.5mm coper enameled wire, 10turns on 12mm diameter will suffice.
So in that case, R30 is not used as well. Am I right?

And approximately how much is a piece of Muse KG 10,000uF, 50V?

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Old 2nd January 2009, 02:39 PM   #538
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by roender
I never use L1. If you think you need one, 1.5mm copper enameled wire, 10turns on 12mm diameter will suffice.
that is about 2uH + 7mohm. Is that enough?
__________________
regards Andrew T.
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Old 2nd January 2009, 02:44 PM   #539
roender is offline roender  Romania
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Andrew, the amp is stable without L1.
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Old 2nd January 2009, 03:37 PM   #540
catalin is offline catalin  Romania
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Hello and Happy new Year !
Very sexy design! Congratulations Roender !
I copy the ltspice file (ltspice installed and used for the first time) .
I can't simulate because : "Multiple instances of "Flag" "
Do you know what can i do ?
Thank you !
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