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Old 19th December 2010, 10:38 AM   #1
wwenze is offline wwenze  Singapore
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Default Recommend resistors with a budget of <$2 each?

By <$2 (USD), I mean it can be $0.20, like the Dale CMF/RN metal-film that I'm currently looking at. Also looking at Ohmite, both the metal film and carbon comp. My budget can stretch till $2.

As they're meant for building attenuators - just a simple 2-resistor potential divider, I'm not sure if I can live with 5% tolerance of the Ohmites unless I hand-match them. On the other hand Dales are available @ 0.1% for 50 cents.

From a non-snake-oil perspective, is carbon comp better or worse than carbon film?
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Old 19th December 2010, 12:12 PM   #2
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I use the Vishay CMF55's all the time for through-hole. Surface mount resistors can be really good for a project like this (attenuator). I found that the impedance of garden variety R1205 to be about the same as CMF55s.
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Old 23rd December 2010, 12:15 PM   #3
qusp is offline qusp  Australia
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Old 23rd December 2010, 12:28 PM   #4
AndrewT is offline AndrewT  Scotland
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Originally Posted by wwenze View Post
I'm not sure if I can live with 5% tolerance of the Ohmites unless I hand-match them.
+-5% is not acceptable for a switched stereo attenuator. That would give nearly 1dB of imbalance as you switch through the attenuator.

2% matching would be OK. Absolute accuracy is not required for music listening attenuator.
regards Andrew T.
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