User avatar
By MovieSean
#4933439
Hey all,
I am looking for the correct volume pot for the GBFans board, I am using a guitar knob right now and getting a TON of feedback and dropping connection and inconsistent volumes. Any help would be appreciated!

Thanks!
By Spectregater
#4933444
First one I tried seemed to have a little. But the second one I wired up has been fine.
Also they are the same style spongface uses in his spirit pack electronics upgrade kit.
User avatar
By greg883
#4933605
Just a guess, but your Guitar part probably uses an Audio Taper, not a Linear Taper. What's the difference? A linear taper is just that. A straight 0 to 10k from end to end. Midpoint will be 5k ohms. Audio taper is more of a logarithmic curve to match the sensitivity of the human ear. The first 2/3 of rotation is a small change in resistance with a rapid increase (almost a straight line up) for the last 1/3rd.

The GB "volume" is providing a control voltage to the circuit that adjusts the output from the amplifier. I think the circuit is actually using a programmed "map" to make the output act like an audio taper.

Edit: Just looked up the instructions, I remembered correctly:

The volume control on this particular amp is based on a dc control voltage and has a nonlinear correction built in. An audio (logarithmic) taper pot can be used but will be more sensitive to volume adjustments.
NotSabbat liked this
Hasbro Ghostbusters

Someone already has all 4 Fright Feature figures! […]

NYTF: Hasbro reveals Kenner Classics

I got Stay Puft and Green Ghost today, shipped in […]

I had their car, which could change into a jet and[…]

George Barris, known as the "King of Kustomiz[…]