relay volume control - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 2nd May 2007, 09:34 AM   #1
diyAudio Member
 
Join Date: May 2007
Send a message via MSN to cubezone
Default relay volume control

Cube X200 Rev 2.0 relay volume control
this is my recent project. now ,under test..

It have two channel, each channel has 8 resistances and relays. means that it only have nine (eigth and one mute) volume steps. but i think it is enough in most condition. controled by the ATmel 89S52 microcontrol with remote and LCD .
Click the image to open in full size.
another view.
Click the image to open in full size.
microcontrol chip 89s52
Click the image to open in full size.
LED & LCD
Click the image to open in full size. Click the image to open in full size.
emothion icon
Click the image to open in full size.
  Reply With Quote
Old 2nd May 2007, 12:46 PM   #2
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
any details forthcoming?
__________________
regards Andrew T.
  Reply With Quote
Old 2nd May 2007, 01:27 PM   #3
Dxvideo is offline Dxvideo  Turkey
diyAudio Member
 
Dxvideo's Avatar
 
Join Date: Nov 2003
Location: Turkey
Send a message via Yahoo to Dxvideo
I think we can get 64 steps by only 6 relays and 6 resistors. If we configure resistors in some parallel that may be realised.
For example;
If you use eight 4K7 on each relays input and when you activate 1st and 2nd relays simulaneously then you have 2K35 input resistance. And also you can set parallel 3rd and fourth and etc by this way.
May this system work? What do you say?
__________________
Best regards,
Ozgur
  Reply With Quote
Old 2nd May 2007, 01:32 PM   #4
Dxvideo is offline Dxvideo  Turkey
diyAudio Member
 
Dxvideo's Avatar
 
Join Date: Nov 2003
Location: Turkey
Send a message via Yahoo to Dxvideo
Never mind my idea.. ********!
Sorry.
__________________
Best regards,
Ozgur
  Reply With Quote
Old 2nd May 2007, 01:43 PM   #5
diyAudio Member
 
Ouroboros's Avatar
 
Join Date: Dec 2003
Location: Nottingham UK
If the relays have change-over contacts, you could build an R-2R ladder netwrk to give 64 level steps using 6 relays.
  Reply With Quote
Old 2nd May 2007, 01:44 PM   #6
Dxvideo is offline Dxvideo  Turkey
diyAudio Member
 
Dxvideo's Avatar
 
Join Date: Nov 2003
Location: Turkey
Send a message via Yahoo to Dxvideo
That means my idea is not b u l l s h i t ?
__________________
Best regards,
Ozgur
  Reply With Quote
Old 2nd May 2007, 01:50 PM   #7
diyAudio Member
 
Ouroboros's Avatar
 
Join Date: Dec 2003
Location: Nottingham UK
Do a search on Google for 'R-2R ladder network' and you'll see the principle. It's used in D/A convertors. If your audio signal is fed into the ladder network to the same place as the reference voltage is fed in the DAC application, then you'll get a binary-controlled attenuator. Obviously you'll need external logic to ensure that your relays get switched in a binary sequence.
  Reply With Quote
Old 2nd May 2007, 01:54 PM   #8
Dxvideo is offline Dxvideo  Turkey
diyAudio Member
 
Dxvideo's Avatar
 
Join Date: Nov 2003
Location: Turkey
Send a message via Yahoo to Dxvideo
Hmm there are a lot of documents on that issue!
So you say we need relays with change over contacts? Whats that? Is it a kind of third position? Or what?
Because as I see in R-2R ladder documents they use normal three contact relays..
__________________
Best regards,
Ozgur
  Reply With Quote
Old 2nd May 2007, 02:02 PM   #9
diyAudio Member
 
Ouroboros's Avatar
 
Join Date: Dec 2003
Location: Nottingham UK
Yes, just the normal three contacts. Normally when people talk of 'changeover contacts' they mean a switch or relay that has a 'Common' contact, a 'Normally-open' and a 'Normally-closed' contact.
  Reply With Quote
Old 2nd May 2007, 02:08 PM   #10
Dxvideo is offline Dxvideo  Turkey
diyAudio Member
 
Dxvideo's Avatar
 
Join Date: Nov 2003
Location: Turkey
Send a message via Yahoo to Dxvideo
I see.
So we get make a real attennuator with just 6 relays and some resistors (or a ready made r-2r IC)..
This is a shiny idea..
But do you think that affects the sound quality?
__________________
Best regards,
Ozgur
  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
relay volume control - POP! wayne325 Pass Labs 22 26th August 2006 01:58 AM
ADC for relay volume control? hegestratos Solid State 7 17th January 2005 11:39 PM
Remote relay volume control kit. harvardian Swap Meet 1168 15th September 2004 07:07 PM
Relay Volume Control for BLS promitheus Pass Labs 60 10th May 2004 06:12 AM


New To Site? Need Help?

All times are GMT. The time now is 08:59 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