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Old 2nd February 2009, 03:40 PM   #1
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Default line stage attenuation options

I'm building a B1 buffer with the modification of using an LDR-based attenuator in lieu of a traditional potentiometer. To get the input impedance back up to around 30k, I'd like to insert some quality resistors like Vishay or Caddock and I wanted to get some sort of consensus on what type of resistor is best in that application and which manufacturer might sound best. In this situation are thin film, thick film, wire wound, etc best? What sort of wattage rating do I need? Should these be sinked to deal with the inevitable heat?

thanks in advance,
Marc
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Old 2nd February 2009, 07:10 PM   #2
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In my experience, the lowest noise and most neutral resistors are the Vishay/Dale RN55D or RN60D. They are not ROHS compliant, but this is not an issue for DIY'ers. They offer performance way beyond their cost. 1/8 to 1/4 watt is all that's required for RNxxD's in a buffer/preamp attenuator. These resistors have a very underrated power rating. If in doubt, on power rating then go with the 1/4 watt.

Check www.mouser.com for prices.

-David
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Old 3rd February 2009, 01:37 PM   #3
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Awesome. Thanks for the tip!
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Old 3rd February 2009, 01:49 PM   #4
johnYks is offline johnYks  Australia
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Hello Marc Brown

Peter Daniel has covered this topic extensively
on this thread:

diyAudio Forums diyAudio Forums > Top >Amplifiers >Chip Amps >In search of a perfect attenuator

In search of a perfect attenuator

Yours Sincerely
John
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