ruffrecords said:Looks goo to me. The only thing you might change is to add a coupling between the first op amp output and the 10k pot. There are two reasons for this. First it means any dc offset at the output of the first op amp is not fed into the second op amp. Secondly, de flowing through a pot wiper is a recipe for scratchy noises.
Cheers
Ian
1uF and 10K has a -3dB point at 16Hz. It really needs to be ten times lower so I would recomend at least a 10uF electrolytic.RSRecords said:
What would be a good cap value for this? 1uf Film cap?
RSRecords said:Started ordering parts today.
How would using a 25k pot instead of a 10k change things? I have a healthy supply of nice 25k pots but no decent 10k unfortunately.
Alpha (Taiwan) do a very nice range of 9mm pots with 1/4 inch metal shafts.Any recommendations for decent 10K Audio pots? Seems like I can only find super cheapies or $10 stuff. I'd prefer plain 1/4 shaft for the knobs I've chosen but that can change as well.
Thanks
ruffrecords said:The value is not critical provided you use the non-inverting op amp topology so the pot is not heavily loaded.Alpha (Taiwan) do a very nice range of 9mm pots with 1/4 inch metal shafts.
https://www.thonk.co.uk/shop/alpha-9mm-pots-right-angle/
also available from Small Bear in the US.
Cheers
Ian
RSRecords said:Thanks, I will check it out.
hitchhiker said:The gain set on my SPA-62 output amps are 56k with a 22pf cap. Not unity but is unity gain what you need?
gar381 said:Just a quick note here... All Sphere Eclipse Fader Amps and BST Amps are set up for 15db of gain.
GARY
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