Potentiometer for CMoy Headphone Amp

[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.

Am I correct?



Thanks for the help,

Nigel

 

[Eeyore]

"Nigel Heather

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

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.

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?

Yes, but the term audio taper is probably more correct actually. But log is
quicker to say.

Graham

 

[Jasen Betts]

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

Am I correct?

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]

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

 

[Eeyore]

"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'.

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'.

It is.

Graham

 

[neon]

Taper means non linear pot. it can follows a log. or factors.