I'm building another GC using the below schematic.
I have a Noble 100K logarithmic pot, type 204.
I've seen that people recommend linear pots for GC's.
Can I compensate in some way using this logarithmic Noble? If possible, what should I do...?
By the way, why are logarithmic pots not recommended?
(Haven't soldered it in yet, so I haven't heard the amp in action with this Noble).
Thanks.
/Jan
I have a Noble 100K logarithmic pot, type 204.
I've seen that people recommend linear pots for GC's.
Can I compensate in some way using this logarithmic Noble? If possible, what should I do...?
By the way, why are logarithmic pots not recommended?
(Haven't soldered it in yet, so I haven't heard the amp in action with this Noble).
Thanks.
/Jan
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I'm very curious why they are not recommended? I used exactly the same pot in the same circuit and it works fine.
Wht is not recommended, is the 100k value. I'd rather go for 50K, but if not available 100k will work too. Actually, I tried linear pot in this location, and I prefer the action of the logarythmic one.
Wht is not recommended, is the 100k value. I'd rather go for 50K, but if not available 100k will work too. Actually, I tried linear pot in this location, and I prefer the action of the logarythmic one.
Peter Daniel said:I'm very curious why they are not recommended? I used exactly the same pot in the same circuit and it works fine.
Wht is not recommended, is the 100k value. I'd rather go for 50K, but if not available 100k will work too. Actually, I tried linear pot in this location, and I prefer the action of the logarythmic one.
Thanks for your information, Peter. I didn't mean that Nobles were supposed to be not recommended.
However, in this schematic someone (?) recommends linear tapers: http://ampchipdiy.com/invertedLM3875_r2_1.gif
I will use this 100K Noble 'cause I have it already.
/Jan
Peter Daniel said:BTW, those Nobles are pretty good sounding pots.
Yep, I've seen you mention this before...I tried an old Alps Black Beauty 100K first, but took it out 'cause channels were not in balance. Looking forward to trying this Noble.
There is a 12 step attenuator in this link http://www.geocities.com/rjm003.geo/rjmaudio/diy_gc.html
If I would be doing one for me, I would use 2db steps from full volume down (-22dB would be 11 pos and OFF would be the last one). I don't listen at rally low volumes so this would work well for me.
In here, there are some values listed as well: http://www.penguinlovers.net/audio/Attenuator.html
Another calculator here: http://homepages.tcp.co.uk/~nroberts/shunt.html
If I would be doing one for me, I would use 2db steps from full volume down (-22dB would be 11 pos and OFF would be the last one). I don't listen at rally low volumes so this would work well for me.
In here, there are some values listed as well: http://www.penguinlovers.net/audio/Attenuator.html
Another calculator here: http://homepages.tcp.co.uk/~nroberts/shunt.html
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