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

On Wed, May 21, 2025 at 07:29:51PM -0700, Len Ovens wrote:
 
> I was thinking the input element would probably be a FET

Unlikely for a mic input. As long as Zin is a few kOhm it
would be OK.

Some (much more expensive) mic preamps use a 1:5 or 1:10
transformer followed by a FET. That can work really well.
 
> It says 101 which should be 100pf. Guitar pickup coils
> could be anywhere from 5 to 20k

That would be DC resistance, which is not very relevant.
When the volume pot is fully up you have C11 + cable 
capacitance in parallel with the *inductive* impedance of
the pickup. That will result in a resonance peak damped
only by the volume pot and preamp input impedance.

This is the main reason why different cables may have
there own 'sound'.

Ciao,

-- 
FA


_______________________________________________
Linux-audio-user mailing list -- linux-audio-user-cunTk1MwBs/[email protected]
To unsubscribe send an email to linux-audio-user-leave-cunTk1MwBs/[email protected]