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Old 14th July 2009, 02:41 PM   #1
Puffin is offline Puffin  United Kingdom
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Default F2

I have bought some F2 boards in the group buy.

I want to get this amp right and use good quality and correctly rated components.

I would appreciate peoples views on which makes and type of resistors would be best suited to the F2.
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Old 15th July 2009, 10:39 AM   #2
Puffin is offline Puffin  United Kingdom
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What no-one?!
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Old 15th July 2009, 12:41 PM   #3
FYC is offline FYC  Hong Kong
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I believe circuit topology comes first, so I am not keen on using exotic components in building my F2.

Resistor rating - please refer to the document in FirstWatt download. I only use industrial grade stuff. For DIYer, Digikey can be a good source.

Once you build it using standard components, I believe you got the majority of the performance level set. Playing around with components are then more of a personal taste or choice.
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Old 18th July 2009, 09:59 PM   #4
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Default Re: F2

Quote:
Originally posted by Puffin
I have bought some F2 boards in the group buy.

I want to get this amp right and use good quality and correctly rated components.

I would appreciate peoples views on which makes and type of resistors would be best suited to the F2.

Metal film resistors are a good start where possible.

Buy the rest from a high class distributor.

Keep away from ebay !
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Old 21st July 2009, 01:10 AM   #5
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use the vishay/dale metal film -- I think they are the type "RN".

they come in nifty hot dog brown color, so your boards will look like they are covered with tiny wienerschnitzels.

JJ
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Old 21st July 2009, 01:07 PM   #6
Puffin is offline Puffin  United Kingdom
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O.K sounds like a good idea to me!
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Old 21st July 2009, 03:43 PM   #7
Tea-Bag is offline Tea-Bag  United States
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I user RN55D from mouser for most resistors. They are usually less than 10 cents USD.

If I go big bucks, I use PRD 1/4 watt for signal path, and mills for Power resistors.

I plan on Panasonic power resistors and RN55d for the F2...
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Old 21st July 2009, 08:53 PM   #8
toufu is offline toufu  United States
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By the way, what should the voltage rating be for the caps?
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Old 21st July 2009, 09:00 PM   #9
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Quote:
Originally posted by toufu
By the way, what should the voltage rating be for the caps?

When properly loaded fromthe 24v power supply, the onboard votage of the F2 is ~20v. I think the L1 brings the V down. I would feel fairly safe with 25v ones.
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Old 21st July 2009, 09:28 PM   #10
toufu is offline toufu  United States
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Cool! Thanks!
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