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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: My new attenuator is a hum balance control....WTH? posted by RJ Lennan on April 4, 2002 at 18:54:22:
The most important thing is the Alps "pot" you used. For a passive attenuator, you should be using 10 KOhms, not 100 KOhms.The circuitry between the "pot" and the amp is HIGH impedance and vulnerable to hum pickup. When you advance the control fully, the "pot" and the I/P resistor in the amp are in parallel, forming a composite I/P resistor. That alters the circuits behavior.
Either you buy a 10 KOhm "pot" or you actively buffer the 100 KOhm "pot".
Eli D.
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Follow Ups
- Re: My new attenuator is a hum balance control....WTH? - Eli Duttman 19:55:40 04/04/02 (4)
- Re: My new attenuator is a hum balance control....WTH? - RJ Lennan 21:04:09 04/04/02 (3)
- Re: My new attenuator is a hum balance control....WTH? - Eli Duttman 23:18:29 04/04/02 (0)
- Re: My new attenuator is a hum balance control....WTH? - hk29 21:10:28 04/04/02 (1)
- Re: My new attenuator is a hum balance control....WTH? - Eli Duttman 23:12:57 04/04/02 (0)
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