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Old 4th March 2013, 04:41 AM   #1
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Default resistor size difficulty

Hi and thanks for reading this post.

I have a few blown one watt resistors i want to replace in my power amp and have been on mouser, digikey, farnell etc but cannot find sizes small enough.

I have just 8.5mm in width on the board so am thinking about using surface mount resistors as these are available in smaller packages.

Do you think this is a wise move switching from through hole to surface mount, has anyone done this and what are your experiences concerning sound quality changes.

Many thanks in advance. John.
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Old 4th March 2013, 04:59 AM   #2
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Try these. The 1W resistors are 9mm long.

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Old 4th March 2013, 05:08 AM   #3
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Hot-running resistors shouldn't be in contact with the circuit board in any case. Bend the leads under and down to fit the mounting holes.
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Old 4th March 2013, 05:53 AM   #4
UrSv is offline UrSv  Sweden
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This kind fill most likely fit:

10pcs Ceramic Cement Power Resistor 5W 0 47 Ohm | eBay
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Old 4th March 2013, 06:37 AM   #5
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Default resistor size difficulty

Hi. Thanks for the replies, much appreciated.

I am really after advice concerning switching from through hole resistors to surface mount, is this possible from a sound quality point of view, has anyone done this and what were the results..

Thanks. John.
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Old 4th March 2013, 08:35 AM   #6
AndrewT is offline AndrewT  Scotland
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A pair of 0.6W resistors give a 1.2W rating. Fit one on top side and before you trim the leads solder the second on the bottom side.

Far cheaper than keeping a stock of higher wattage resistors.
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Old 4th March 2013, 09:30 AM   #7
JMFahey is offline JMFahey  Argentina
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Quote:
switching from through hole resistors to surface mount, is this possible from a sound quality point of view,
Can't see why would sound change.
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Old 4th March 2013, 08:36 PM   #8
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I have to secund AndrewT's suggestion. If it was 1 watt ind it blew, paralell resistors to make up a higher wattage. I would possibly not stop at 2x0.6w, but rather aim for 3 or even 4x 0.6w .
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Old 5th March 2013, 06:37 AM   #9
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Hi. Thanks for the replies.

I've found a few surface mount resistors on mouser but cannot understand the datasheet, usually when purchasing through hole resistors i look for descriptions such as low noise or military or suitable for audio etc but there is no mention.

Does anyone understand datasheets better than me or has an opinion on the caddock mk 132 series,vishay dralorik crcw-hp, vishay wsc/wsn series.

Are these suitable for audio amps.

Thank you. John.
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