Volume control for stereo signal?

[MRW]

Hello all,

Let's say I have two mono sources that will be outputted as a stereo
signal to a headphone. If the mono sources pass thru two simple opamp
configured as inverting amplifiers, how do I control the amplitude
level of both mono sources simultaneoulsy? Is there a potentiometer
that has multiple variable resistors that can be controlled by one
knob?

Thanks!

 

[Jon Slaughter]

Hello all,

Let's say I have two mono sources that will be outputted as a stereo
signal to a headphone. If the mono sources pass thru two simple opamp
configured as inverting amplifiers, how do I control the amplitude
level of both mono sources simultaneoulsy? Is there a potentiometer
that has multiple variable resistors that can be controlled by one
knob?

Yep there sure is.

 

[[email protected]]

Hello all,

Let's say I have two mono sources that will be outputted as a stereo
signal to a headphone. If the mono sources pass thru two simple opamp
configured as inverting amplifiers, how do I control the amplitude
level of both mono sources simultaneoulsy? Is there a potentiometer
that has multiple variable resistors that can be controlled by one
knob?

Thanks!

dual ganged logarithmic potentiometers are made for just this purpose.
Surprising you haven't heard of them.

Radio Shack do a 100k one for $3.99 if you are in the USA

 

[Jon Slaughter]

dual ganged logarithmic potentiometers are made for just this purpose.
Surprising you haven't heard of them.

Radio Shack do a 100k one for $3.99 if you are in the USA

although remember that radio shack always adds there 1000% gratuity tax,
1000% feed the radio shack CEO's tax, 1000% misc tax, 1000% accidential tax,
etc...

 

[[email protected]]

although remember that radio shack always adds there 1000% gratuity tax,
1000% feed the radio shack CEO's tax, 1000% misc tax, 1000% accidential tax,
etc...

Yeah, but is someone forcing you to buy it there? If I want 100 pieces,
I shop - Mouser, Digi-Key and such. For a one-off, I don't mind $5-$10
for a $1 part if it makes the project work _now_.

GG

 

[Eeyore]

Hello all,

Let's say I have two mono sources that will be outputted as a stereo
signal to a headphone. If the mono sources pass thru two simple opamp
configured as inverting amplifiers, how do I control the amplitude
level of both mono sources simultaneoulsy? Is there a potentiometer
that has multiple variable resistors that can be controlled by one
knob?

You need a 'stereo' or twin gang pot. For audio you'll also want one with an
audio taper to give it a sensible change of volume with rotation.

Graham

 

[[email protected]]

You need a 'stereo' or twin gang pot. For audio you'll also want one with an
audio taper to give it a sensible change of volume with rotation.

Just what I told him yesterday.

"dual ganged logarithmic potentiometers are made for just this

purpose. "

 

[Don Bowey]

Just what I told him yesterday.

Do you have a point?