[Elecraft] K3 Audio Low Pass Filter

[Brett Howard]

What would be slick is if you had a pair of headphones and a headphone
splitter Y cable.  Plug the headphones into one port and the sound card
input into the other and then take measurements.  That would be a bit more
true to life.

~Brett

-----Original Message-----
From: Alexander Ponomarenko [mailto:ur5lam at gmail.com] 
Sent: Monday, July 06, 2009 8:40 AM
To: Paul Christensen
Cc: Brett Howard; Elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 Audio Low Pass Filter

I think 100uF caps is enough value. Look these plots (with 100uF in 
AF-amp),
we see identifical plots for Line-out and for Phone-out.

logarithmic view: http://forum.cqham.ru/download.php?id=43583
linear view: http://forum.cqham.ru/download.php?id=43582

73! Alex

Paul Christensen :
>> I've been informed Elecraft is already replacing those caps with 100uF
>> caps in the current production units.
>>     
>
> My guess is that scaling the caps beyond 100 uF is only of interest to a 
> small minority of ops.  The majority will probably be happy with the
current 
> choice of 100 uF.  Going from 10 uF in the prior design to 100 uF is
already 
> a significant step in the right direction.