[LAU] Re: Guitar to USB devices can be quite good

On Wed, 21 May 2025, Fons Adriaensen wrote:

> Removing the DC bias is of course a good idea. But I don't think
> the resulting input impedance will be anywhere near to 1M. Together
> with C11, 1M would form a 1.6 Hz highpass. In other words, if the
> chip input impedance were really around 1M then C11 could (and
> should) be smaller.

That makes sense. I was thinking the input element would probably be a FET 
but really the manufacture offers no spec on input impedance.

> Now even if the resulting input impedance is lower than what
> a typical guitar amp input would provide, that shouldn't be a
> big problem. You will just need some EQ to compensate, and the
> volume control on the instrument may 'feel' different.

It certainly sounds better than it did before. I don't do volume fades so 
may not notice feel. The lack of switch pops and scratchy pot sounds makes 
it worth while.

> Then there's C18, no value given. It will resonate with the
> pickup inductance at some frequency, so it may be interesting
> to experiment with.

It says 101 which should be 100pf. Guitar pickup coils could be anywhere 
from 5 to 20k and the volume pots are 500k (in my case) 250k for single 
coil guitars.

Thank you for your input

--
Len Ovens
www.ovenwerks.net
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