Author Topic: Differernce between A and D taper?  (Read 2534 times)

jpm83

Differernce between A and D taper?
« on: January 16, 2008, 11:30:58 AM »
I just "salvaged" a couple of 50k D taper pots from radio cassette recorder. I have understood that D is some sor of audio taper, but what kind.

Janne

John Lyons

Re: Differernce between A and D taper?
« Reply #1 on: January 16, 2008, 01:49:09 PM »
I don't think I've heard or a "D" taper.
Put a knob on the shaft and mount it in a box or cardboard so it wont slip.
Mark the rotations %.
Measure the resistance at 25%, 50%, 75%, and 100% (or smaller increments) and make a graph of the taper curve.
Then you will know what the taper is.

John

Basic Audio Pedals
www.basicaudio.net/

Dai H.

Re: Differernce between A and D taper?
« Reply #2 on: January 16, 2008, 02:56:13 PM »
I've read of them and one source describes it as an accentuated audio taper

http://part.freelab.jp/image/VRcave.gif

John Lyons

Re: Differernce between A and D taper?
« Reply #3 on: January 16, 2008, 03:32:37 PM »
Whaddaya know...?
Cool little graph there. Thanks Dai.

john

Basic Audio Pedals
www.basicaudio.net/

Dai H.

Re: Differernce between A and D taper?
« Reply #4 on: January 16, 2008, 04:06:20 PM »
sure, no problem. I just happened to have that link because I was searching for info on the (apparently slightly unusual) "D" taper to see if I could find some connection between that and old wah pot tapers.

jpm83

Re: Differernce between A and D taper?
« Reply #5 on: January 16, 2008, 04:44:19 PM »
Thanks for the replies. So it's even more logarithmic than A taper.

Janne

d95err

Re: Differernce between A and D taper?
« Reply #6 on: January 17, 2008, 08:36:50 AM »
Just remember that different manufacturers use different ways to label their pots. Sometimes "A" is for Audio, sometimes its A(linear) B(log) and C(rev log). To know the taper of a pot, you need to read the datasheet from the manufacturer or measure it (as suggested above).

Re: Differernce between A and D taper?
« Reply #7 on: January 17, 2008, 10:37:36 AM »
Maybe there are exeptions, but normally American and Japanese manufacturers use b for linear and a for log tapers, European companies use a for linear and b for log.

Dai H.

Re: Differernce between A and D taper?
« Reply #8 on: January 17, 2008, 03:24:56 PM »
the other little bit of info I found here:

http://www.rane.com/par-p.html

Quote
audio taper (aka A-taper): Usually 15% resistance at the 50% rotation point.

log taper (aka D-taper): Often used as an audio taper since its 50% rotation point has 10% resistance.

and as far as the wah pot stuff this is what I was looking at:

http://www003.upp.so-net.ne.jp/kazuhee/wahpots.htm

pawleep

Re: Differernce between A and D taper?
« Reply #9 on: January 01, 2018, 09:31:02 PM »
will a D taper (dournes D250K) work ok for a guitar or bass volume and/or tone?

thermionix

Re: Differernce between A and D taper?
« Reply #10 on: January 02, 2018, 02:47:06 AM »
yes
FDH