Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Pass Labs This forum is dedicated to Pass Labs discussion.

DCB1 questions,
DCB1 questions,
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 3rd December 2012, 06:07 AM   #1
gbullimore is offline gbullimore  United Kingdom
diyAudio Member
 
Join Date: Jun 2007
Default DCB1 questions,

I have already had a search and not found an answer to these.
if someone could help to answer i would be very grateful.

input resistor,
my stepped attenuator has a log curve and a constant ~9k output impedance,
i assume changing the input resistor (to ground) to 1M will be the correct thing to do?
Quote:
The input resistance of the attenuator circuit depends upon the
relay setting (the volume), but will always be above 22Kohm. The attenuator output impedance is a constant 8.9 Kohms
  Reply With Quote
Old 3rd December 2012, 10:25 PM   #2
william2001 is offline william2001  United States
diyAudio Member
 
william2001's Avatar
 
Join Date: Sep 2001
Location: Excelsior Springs, Missouri
I think the general rule of thumb is 10 times higher, so if the buffer "sees" 9k then I would put in a 100k resistor to ground.
  Reply With Quote
Old 4th December 2012, 03:47 AM   #3
gbullimore is offline gbullimore  United Kingdom
diyAudio Member
 
Join Date: Jun 2007
I thought the 10x was when using Lin pots?
With a log pot I figured I only needed a pull down resistor in case of intermittent input connection.
  Reply With Quote

Reply


DCB1 questions,Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
[Help] where I can buy DCB1 kit? a9155040 Swap Meet 12 19th August 2013 01:29 PM
dcB1 active crossover buzzforb Pass Labs 3 23rd March 2012 09:06 PM
DCB1 Mesmorize PCB KatieandDad Swap Meet 0 26th February 2012 03:30 PM
WTB DCB1 weskoki Swap Meet 0 9th May 2011 08:23 PM


New To Site? Need Help?

All times are GMT. The time now is 05:44 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki