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Old 7th April 2010, 06:38 AM   #1
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Default Which resistors to use???

Hi,

I'm currently getting started with building my Pass family (F3, F5, Aleph J).

All boards are Peter Daniel boards.

My problem:

I can't find the resistor recommendations. If I remember correct:

F5: All low power resistors Dale RN55D
F3, Aleph J: All low power resistors Dale CMF-55

Is this correct?

Where do you source them from???

Thanks, Dirk
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Old 7th April 2010, 07:13 AM   #2
h_a is offline h_a  Europe
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Use whatever metal film resistors with the same size you can get easily. Lots of good brands, like Vishay Beyschlag (Conrad), Welwyn (Farnell) etc available.

The CMF-55 are available from Digikey.

Have fun, Hannes
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Old 7th April 2010, 07:55 AM   #3
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Hi Hannes,

RN55D and CMF-55 have different power ratings. I think, I rembember that different resistors were used for F5 and F3/AlephJ.

Am I right? Or do I remember incorrect? Could I also use CMF-55 for F5??? (on Daniel boards?)

Regs, Dirk
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Old 7th April 2010, 01:31 PM   #4
h_a is offline h_a  Europe
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Hi Dirk,

from what I know the RN55D are military grade, so their power rating IMHO is only half of what is standard (for this size) for even higher reliability. I think the CMF-55 have the same dimensions, just twice this power rating. If so, you can use CMF-55 everywhere.

Anyway, the resistors usually run far below these ratings.

I think in Nelson's original schematics he is using 1/4 W resistors througout, with the exception of the usual source degeneration resistors which are 3W Panasonic types.

Have fun, Hannes
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Old 7th April 2010, 02:42 PM   #5
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CMF55 have slightly higher ratings and a slightly bigger physical size. I think, I'll go for these for all of the amp, if noone has objections against this....
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Old 7th April 2010, 03:11 PM   #6
EUVL is offline EUVL  Europe
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RN55 and CMF55 are the same. While use for military you have to lower the power rating.

The CMF55 you can get from Schuro has non-magnetic end caps. Expensive but 0.1% so no matching required.

You can also get PRP 9372 which is also non-magnetic but has a slightly higher tempco, e.g. from

PRP Quarter Watt Resistors

Not sure about source in DE. Pls google.

Beyschlag and Welwyn both have magnetic end caps and are not much cheaper.


Patrick
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Old 7th April 2010, 03:20 PM   #7
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Use resistors that will fit the boards: Digi-Key

F5, AJ-X CMF50
F3 CMF55

Smaller size resistors are also more expensive
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Old 7th April 2010, 03:35 PM   #8
EUVL is offline EUVL  Europe
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If I am not wrong you can also use Caddock MK132 instead of CMF50 ?
Available from Mouser.


P.
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Old 15th July 2010, 06:50 PM   #9
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Quote:
Originally Posted by EUVL View Post
If I am not wrong you can also use Caddock MK132 instead of CMF50 ?
Available from Mouser.


P.
Jeez. If you're simply made of money. I'm being quoted £12 each for some of these from Farnell, the UK's cheapest supplier. It seems that both Caddock MK132 series and Dale/Vishay CMF 50 series are all imported from US per order, at vastly greater cost.

I notice that you are using a whole host of different types in your monoblocks Peter.

Can anybody else recommend resistors for the Peter Daniels F5 boards please? Are 1% metal film resistors so different from manufacturer to manufacturer? I have some from Hong Kong that I've used in the past without ruining projects, but I'm wondering if I should be fussier with the F5 and use more exotic ones, as the project is costing me so much anyway.

Many thanks
Lucas
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Old 19th July 2010, 06:28 AM   #10
Tiroler is offline Tiroler  Austria
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Dirk,
there is an excellent online shop in Germany, they have all thenice stuff... just look here: Online-Shop der Schuro Elektronik GmbH
Martin
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