[sdiy] Vactrols subbed for dual-gang pot

[Paul Perry]

>From a practical aspect, mismatching the resistors in
these things usually just lowers the maximum Q, I think.
Maybe the EEs will comment.
I expect your vactrols will be fine.
People often build this stuff with caps that are only 10%
accuracy anyway!

paul perry melb aust
----- Original Message ----- 
From: "Dave Kendall"> By hand-selecting LED/LDR pairs, I can match the off 
resistance of the
> home-rolled vactrols to within a few ohms, and limit the max resistance
> fairly easily, but between those points, I suspect the LDRs may "drift
> apart" due to different response curves to incoming CV. How would this
> affect the BPF circuit? Does it even matter?