PCM2902 volume control - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

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 7th November 2005, 07:12 PM   #1
jmar is offline jmar  United States
diyAudio Member
 
Join Date: Jan 2004
Location: Indiana
Default PCM2902 volume control

I see there are pins on this chip to control volume up and down.

I want to build a simple ired remote control with some Holtek chips and was wondering if anyone knows how these pins behave.....(don't have anything breadboarded or I'd answer my own question).

If you give the pin(s) a steady high does the volume gradually get louder/softer?....or do you have to give a pulse to increment the volume?

Thanks kindly.
  Reply With Quote
Old 7th November 2005, 08:24 PM   #2
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
I agree that the data sheet is not unequivocally clear on this, but it does mention that these inputs are "active high" which normally indicates they are activated on a logic high input.

So, it seems that the volume goes up (or down) as long as the specified input is logic high. The proof probably lies in the eating of the pudding.

Jan Didden
__________________
If you don't change your beliefs, your life will be like this forever. Is that good news? - W. S. Maugham
Check out Linear Audio!
  Reply With Quote
Old 7th November 2005, 08:30 PM   #3
Nisbeth is offline Nisbeth  Denmark
diyAudio Member
 
Nisbeth's Avatar
 
Join Date: Jan 2001
Location: Denmark
I'm pretty sure they must be pulsed. I believe it's in the datasheet somewhere, but I don't have time to look right now


/U.
  Reply With Quote
Old 8th November 2005, 03:20 PM   #4
jmar is offline jmar  United States
diyAudio Member
 
Join Date: Jan 2004
Location: Indiana
I'd sure be grateful if anyone knew for sure....I'm doing a PCB and don't have a chip handy right now.

I may have to add a pulse to the ouput of my RC decoder.

Unless it reacts to a steady high...in that case, I'm fine.
  Reply With Quote

Reply


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Volume control on DVD player remote. Lose resolution at low volume? Circlotron Digital Source 2 10th June 2011 07:20 PM
i need preamp schematics w/o tone control or volume control hernanstafe Parts 7 30th January 2008 03:12 AM
The remote control paratactic volume control audio-gd Solid State 33 7th June 2007 11:16 PM
remote control motorised control for volume pot/knob CharlesY Parts 0 25th July 2005 11:12 AM
Volume control +4db argonrepublic Parts 5 30th April 2005 11:57 AM


New To Site? Need Help?

All times are GMT. The time now is 06:02 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2