frazzman said:
Hi all,
Just wondering if these pots will do the job? :::
http://au.element14.com/bi-technologies-tt-electronics/p160knp-0qc20a10k/panel-pot-10k-log/dp/1760787
sure, but for usual behaviour with increasing gain when dialing clockwise, you probably won't like it.
(BTW, please update your profile with your location data.)
There seem to be about 30 different pots with the same specs and the price range is all over the place....
... and none of these will do the job for usual behaviour.
With varying resistance (the pot) in the shunt arm of this non-inverting gain stage you don't want these specs. You want a rev.log taper pot.
Just for examples sake with an ideal taper pot (there is no such thing) for a linear dB gain increase.
| pot.rotation% | resistance | dB gain |
| 0% | 10000 | 6.01 |
| 10% | 4026 | 10.82 |
| 20% | 1967 | 15.61 |
| 30% | 1035 | 20.41 |
| 40% | 561 | 25.21 |
| 50% | 306 | 30.01 |
| 60% | 165 | 34.82 |
| 70% | 86 | 39.59 |
| 80% | 41 | 44.35 |
| 90% | 15 | 49.15 |
| 100% | 0 | 54.00 |
Instead your selected, same wired, log taper pot will give you nearly all gain crammed in the last 10% of pot rotation.
| pot.rotation% | resistance | dB gain |
| 0% | 10000 | 6.01 |
| 10% | 9985 | 6.02 |
| 20% | 9959 | 6.03 |
| 30% | 9914 | 6.05 |
| 40% | 9835 | 6.08 |
| 50% | 9694 | 6.15 |
| 60% | 9439 | 6.27 |
| 70% | 8965 | 6.50 |
| 80% | 8033 | 7.01 |
| 90% | 5974 | 8.52 |
| 100% | 0 | 54.00 |
For an australian source for your rev.log pot maybe ask Joe Malone at
JLM-Audio.
For a british source maybe ask Colin from
Audiomaintenance.
good luck
