Maker Pro
Login Join Maker Pro
Or sign in with

Menu

Connect With Us

Network

Maker Pro

audio taper potentiometer

O

[email protected]

Jan 1, 1970
0
M

Meat Plow

Jan 1, 1970
0
Hello all,

I want to change a linear 50k pot to an audio taper 50k pot in my
Fender Blues Junior guitar amp.
Do you know where I can find such a potentiometer ?
I have try to find it in Farnell catalog, with no success ...

I have put some pictures:
http://scalbert.dyndns.org/bj/IMG_0021.JPG
http://scalbert.dyndns.org/bj/IMG_0022.JPG
http://scalbert.dyndns.org/bj/IMG_0023.JPG
http://scalbert.dyndns.org/bj/IMG_0025.JPG
http://scalbert.dyndns.org/bj/IMG_0026.JPG

Thanks very much !

Olivier
Click to expand...

Ask in alt.guitar.amps
--
#1 Offishul Ruiner of Usenet, March 2007
#1 Usenet Asshole, March 2007
#1 Bartlo Pset, March 13-24 2007
#10 Most hated Usenetizen of all time
#8 AUK Hate Machine Cog
Pierre Salinger Memorial Hook, Line & Sinker, June 2004
COOSN-266-06-25794
 
M

mc

Jan 1, 1970
0
Hello all,

I want to change a linear 50k pot to an audio taper 50k pot in my
Fender Blues Junior guitar amp.
Do you know where I can find such a potentiometer ?
I have try to find it in Farnell catalog, with no success ...
Click to expand...

This should be a common item, a PC-board-mounted audio-taper potentiometer.
It may be nominally 47k instead of 50k and might be called log taper rather
than audio taper (similar but not identical). What part of the world are
you in?
 
O

[email protected]

Jan 1, 1970
0
This should be a common item, a PC-board-mounted audio-taper potentiometer.
It may be nominally 47k instead of 50k and might be called log taper rather
than audio taper (similar but not identical). What part of the world are
you in?
Click to expand...

I am living in Belgium. They are less and less electronics shops, so
generally I buy my components at Farnell. But here I do not find any
references ...
 
M

mc

Jan 1, 1970
0
Is there a manufacturer's name on the potentiometer? If so, Google for it,
and find a distributor.

Let me suggest another approach. Add a 27k or 47k resistor from the wiper
(middle contact) of the potentiometer to the low end of the potentiometer.
This is a very old trick for making a linear potentiometer behave more like
an audio taper. It's not perfect, but it may achieve what you want.

Also, write to the people at
www.vibroworld.com
and see what they know.

And look at
http://www.ctscorp.com/components/potentiometers.htm
which is probably the manufacturer. If you can identify the part you want,
they can probably tell you where you can buy it in small quantities.
 
O

[email protected]

Jan 1, 1970
0
Is there a manufacturer's name on the potentiometer? If so, Google for it,
and find a distributor.

Let me suggest another approach. Add a 27k or 47k resistor from the wiper
(middle contact) of the potentiometer to the low end of the potentiometer.
This is a very old trick for making a linear potentiometer behave more like
an audio taper. It's not perfect, but it may achieve what you want.

Also, write to the people atwww.vibroworld.com
and see what they know.

And look athttp://www.ctscorp.com/components/potentiometers.htm
which is probably the manufacturer. If you can identify the part you want,
they can probably tell you where you can buy it in small quantities.
Click to expand...

Hi MC,

Cool, I think it is a CTS Corp Series 296. I will contact them. Thanks
very much.
Olivier
 
W

Why do you need to know?

Jan 1, 1970
0
Only if you find a AT pot to fit in the socket..

You could <chuckle> tap off the LT pot and adjust the 'bend' where
it changes to promote an audio able 'ear friendly' taper. Is what you
want to do going to happen with a taper change? Is it worth it?


JJTj










-----------------------------------------------------
Seems I forgot the next verse..
oh well, I guess it pays to rehearse..
the lyric sheet's so hard to find..
what are the words, oh nevermind...

Weird Al
-----------------------------------------------------
 
I

isw

Jan 1, 1970
0
mc said:
This should be a common item, a PC-board-mounted audio-taper potentiometer.
It may be nominally 47k instead of 50k and might be called log taper rather
than audio taper (similar but not identical). What part of the world are
you in?
Click to expand...

It's been a *long* time, but I believe that an audio taper pot is
ANTIlog, not log. A log pot will work only if you hook it up to get
louder as you crank it CCW.

Isaac
 
M

[email protected]

Jan 1, 1970
0
Hello all,

I want to change a linear 50k pot to an audio taper 50k pot in my
Fender Blues Junior guitar amp.
Do you know where I can find such a potentiometer ?
I have try to find it in Farnell catalog, with no success ...

I have put some pictures:http://scalbert.dyndns.org/bj/IMG_0...JPGhttp://scalbert.dyndns.org/bj/IMG_0026.JPG

Thanks very much !

Olivier
Click to expand...

So-called log pots arent really log. Theyre linear over most of their
scale, with a short section of lower R per distance material at the
bottom end. It may be quicker to reduce the R of the bottom 10%-20% of
the track than find a replacement. This could be done with some
graphite dots at the edge of the track, where the wiper doesnt go.
Graphite is very conductive, so use only the tiniest amout, and dont
get it on the side of the track base, where it coudl conduct to case.


NT
 
M

mc

Jan 1, 1970
0
It's been a *long* time, but I believe that an audio taper pot is
ANTIlog, not log. A log pot will work only if you hook it up to get
louder as you crank it CCW.
Click to expand...

Not as I understand it.

Linear taper = output voltage proportional to rotation

Audio taper = lower at mid-scale than linear

Log taper = same, slightly different curvature
(not truly logarithmic because there is no logarithm of 0)

Antilog taper = higher at mid-scale than linear

To make it get louder instead of softer as you turn it CCW, you reverse the
connections to the 2 ends of the potentiometer, whichever taper you have.
 
R

Ross Herbert

Jan 1, 1970
0
Hello all,

I want to change a linear 50k pot to an audio taper 50k pot in my
Fender Blues Junior guitar amp.
Do you know where I can find such a potentiometer ?
I have try to find it in Farnell catalog, with no success ...

I have put some pictures:
http://scalbert.dyndns.org/bj/IMG_0021.JPG
http://scalbert.dyndns.org/bj/IMG_0022.JPG
http://scalbert.dyndns.org/bj/IMG_0023.JPG
http://scalbert.dyndns.org/bj/IMG_0025.JPG
http://scalbert.dyndns.org/bj/IMG_0026.JPG

Thanks very much !

Olivier
Click to expand...

Your Farnell Belgium part number is the same as in Australia (and the
rest of the world) - 1191756
http://be.farnell.com/jsp/Passive+C...s/ALPS/29+0070/displayProduct.jsp?sku=1191756
 
E

Eeyore

Jan 1, 1970
0
Ross said:
The OP's pics look like a 9mm pot to me
Click to expand...

It's not.

The 9mm types all have a 'sealed' body. His doesn't. 12mm I think.

Graham
 
You must log in or register to reply here.

Similar threads

tedstruk
Frequing resonance at audio taper
Replies
2
Views
1K
Audioguru
Audioguru
A
Special 10% log taper audio potentiometers?
Replies
2
Views
2K
N_Cook
N
N
audio taper pot needed
Replies
7
Views
2K
Nunya Bizness
N
P
Adding an audio output to an old answering machine
Replies
3
Views
218
roughshawd
roughshawd
Y
Steinberg UR44 Audio Interface No Power
Replies
5
Views
345
Harald Kapp
Harald Kapp
Top