Potentiometer for CMoy Headphone Amp

N

Nigel Heather

Guest
I'm building a headphone amp based on the simple CMoy design.

I want to add a variable gain and the design shows adding a dual gang pot on
the inputs as a potential divider.

The design notes say to use an 'audio taper' type potentiometer.

This isn't a phrase that I've come across in the UK - I assume they mean use
a Logarithmic type.

Am I correct?



Thanks for the help,

Nigel
 
Just a simple question that's all.

As far as I can tell, the term 'Audio Taper' is not used at all in the UK.
If you visit a UK electronics retailer (Mpalin, RS, Farnell) you can buy a
Linear (Lin) or a Logarithmic (Log) - no mention of 'Audio Taper'.

All I was asking was whether the Logarithmic Pot that you can buy in the UK
is the same as an 'Audio Taper' that you would buy in the States.

It seems the answer is 'Yes'.

Cheers,

Nigel
 
"Nigel Heather

I'm building a headphone amp based on the simple CMoy design.
Click to expand...
And what's that ?


I want to add a variable gain and the design shows adding a dual gang pot on
the inputs as a potential divider.
Click to expand...
That's how they work.


The design notes say to use an 'audio taper' type potentiometer.

This isn't a phrase that I've come across in the UK - I assume they mean use
a Logarithmic type.

Am I correct?
Click to expand...
Yes, but the term audio taper is probably more correct actually. But log is
quicker to say.

Graham
 
On 2008-09-18, Nigel Heather <nigel@> wrote:
This isn't a phrase that I've come across in the UK - I assume they mean use
a Logarithmic type.

Am I correct?
Click to expand...
basically, except they don't make logaryrthmic potentiometers,
only semi-logarythmic ones... AKA audio taper.

If they were logarythmic all the way there'd be no way to turn the
sound off because if the amplitude halves every -n degrees of rotation
how far would you need to turn the pot to go from full amplitude to silence)

Bye.
Jasen
 
"Nigel Heather
I'm building a headphone amp based on the simple CMoy design.

I want to add a variable gain and the design shows adding a dual gang pot on
the inputs as a potential divider.

The design notes say to use an 'audio taper' type potentiometer.

This isn't a phrase that I've come across in the UK - I assume they mean use
a Logarithmic type.
Click to expand...


It is one type of Logarithmic pot. At one time there were quite a
few, including some reverse Logarithmic pots. Most of them are now
obsolete or special order.


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"Nigel Heather

Just a simple question that's all.

As far as I can tell, the term 'Audio Taper' is not used at all in the UK.
If you visit a UK electronics retailer (Mpalin, RS, Farnell) you can buy a
Linear (Lin) or a Logarithmic (Log) - no mention of 'Audio Taper'.
Click to expand...
Look at the manufacturer's data sheet though !


All I was asking was whether the Logarithmic Pot that you can buy in the UK
is the same as an 'Audio Taper' that you would buy in the States.

It seems the answer is 'Yes'.
Click to expand...
It is.

Graham
 
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