Potentiometer rating

[NOTTNICK]

I need to put a variable pot in a line signal circuit.
I guessed at 10 ohm.
I'd appreciate knowing if this was the right choice.

Thanks
Nick

 

[Daniel]

NOTTNICK wrote:

I need to put a variable pot in a line signal circuit.
I guessed at 10 ohm.
I'd appreciate knowing if this was the right choice.

Thanks
Nick

Why do you need to put a variable pot in a line signal circuit?

When you put "line signal circuit", what do you mean? A.C or D.C signal?

How much current do you need and how much voltage is being applied to
the circuit?

A little information would really help.

Daniel

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[NOTTNICK]

"Daniel" <dxmm@nospam.albury.net.au> wrote in message
news:4555aa8e$0$21176$88260bb3@free.teranews.com...

NOTTNICK wrote:
I need to put a variable pot in a line signal circuit.
I guessed at 10 ohm.
I'd appreciate knowing if this was the right choice.

Thanks
Nick

Why do you need to put a variable pot in a line signal circuit?

When you put "line signal circuit", what do you mean? A.C or D.C signal?

How much current do you need and how much voltage is being applied to the
circuit?

A little information would really help.

Daniel

--
Posted via a free Usenet account from http://www.teranews.com

I use my PC for music playback.
I need to be able to adjust the line level output from a USB sound card from
zero to maximum (ie a volume control) before plugging it into active
loudspeakers (with no volume control).

Thanks

Nick
>

 

[JeffM]

NOTTNICK wrote:

I need to put a variable pot in a line signal circuit.
I guessed at 10 ohm.
I'd appreciate knowing if this was the right choice.
Nick

Unlikely. This http://www.google.com/search?q=define:rheostat
is probably the wrong way:
(...and "variable pot" is redundant.)

NOTTNICK wrote:

I use my PC for music playback.
I need to be able to adjust the line level output from a USB sound card
from zero to maximum (ie a volume control)
before plugging it into active loudspeakers (with no volume control).

Some concepts you need to get a handle on:
http://www.google.com/search?q=defineotentiometer
http://www.google.com/search?q=define:voltage+divider
http://www.google.com/images?q=voltage-divider+Potentiometer

.....and something you hadn't even considered:
http://www.google.com/search?q=Potentiometer+Logarithmic-taper+Linear-taper+Audio+question

 

[default]

On Sat, 11 Nov 2006 10:53:27 -0000, "NOTTNICK"
<NOTTNICK@bellows.org.nospam.uk> wrote:

I need to put a variable pot in a line signal circuit.
I guessed at 10 ohm.
I'd appreciate knowing if this was the right choice.

Thanks
Nick

I think you'd be unhappy with ten ohms - that is way too low. In

series with the signal it won't do much of anything and connected
properly (across the line output with the wiper going to the input on
the speaker amp) it would overload the line output - if it didn't
cause damage it would decrease the output to near zero.

Unless by line out you mean a 4-8 ohm speaker output then 10 ohms
might work. "line output" is normally a low level 1 volt peak to peak
signal with a relatively high impedance output - not designed to drive
a lot of power or low impedance loads.

Think more in terms of 1,000 or 10,000 ohms and get an (dual for
stereo) audio taper potentiometer.

Guessing doesn't work in electronics, until you have worked with lots
of circuits and understand what is happening.

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