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

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Arduino based LDR volume and source selection controller
Arduino based LDR volume and source selection controller
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 18th October 2018, 07:23 PM   #1091
Blamm is offline Blamm  Netherlands
diyAudio Member
 
Join Date: Jun 2016
Most people here build this as a separate preamp, with its own power supply and housing. I am considering building it and integrating it into a case with the TPA3118 boards I already have running.

These run on a 24V power supply like these. Instead of creating the supply mentioned by Vincent here, would it be a terrible impact on performance to fork the needed voltages off this supply using a couple of those cheap and simple adjustable step-down converters?
  Reply With Quote
Old 18th October 2018, 07:25 PM   #1092
zdr is online now zdr  Belgium
diyAudio Member
 
zdr's Avatar
 
Join Date: Nov 2005
Location: Brussels, Beograd
As long as the power is stable and clean, there should be no impact imho.
__________________
Neb. [LDR Volume Control OLED firmware:]
https://drive.google.com/open?id=0B7...ENmRXNYUEtySVE
  Reply With Quote
Old 18th October 2018, 07:46 PM   #1093
Blamm is offline Blamm  Netherlands
diyAudio Member
 
Join Date: Jun 2016
Yeah I think that's the case. Might just give it a go, worst case I can build a new power supply for it all
  Reply With Quote
Old 19th October 2018, 01:52 AM   #1094
wineds is offline wineds  Australia
diyAudio Member
 
Join Date: Apr 2006
Location: Melbourne
I think you could fork the 12v analog ok but I would keep the digital and relay supplies separate. In the original power supply design both these supplies come from a separate transformer winding.
  Reply With Quote
Old 19th October 2018, 04:58 AM   #1095
wineds is offline wineds  Australia
diyAudio Member
 
Join Date: Apr 2006
Location: Melbourne
Note also that the reservoir capacitor for the +8V digital rail (C3 in original design) is important in terms of power down detection and saving of program variables to non volatile memory.
  Reply With Quote
Old 19th October 2018, 07:02 PM   #1096
Blamm is offline Blamm  Netherlands
diyAudio Member
 
Join Date: Jun 2016
Thanks, the buffer op 8V is something to keep in mind indeed! Could be added of course.
Separating the 12V lines properly, to avoid interference I presume, might be more tricky without double windings. A couple of diodes might not fix that.

Guess it's not really worth the effort in that case. Might as well just build the second supply for the preamp.
  Reply With Quote
Old 27th October 2018, 12:07 PM   #1097
yurgs is offline yurgs
diyAudio Member
 
Join Date: Jan 2012
Location: Nuremberg, Germany
Hello,
there are 2 different versions of the firmaware in the shared folder,
VxD OLED 4x2 and VxD OLED 4x2s
do you mind sharing what the difference is?
__________________
Lenco L75/ Jelco 750L/ Denon DL103 Shibata // Hypnotoad's AD797 Pre // LDR Arduino Controller // chocoholic's Liteamp // Prestigeous 2 Monitor
  Reply With Quote
Old 27th October 2018, 12:10 PM   #1098
zdr is online now zdr  Belgium
diyAudio Member
 
zdr's Avatar
 
Join Date: Nov 2005
Location: Brussels, Beograd
S stands for screen saver. The one without s doesn’t have screen saver routine.
__________________
Neb. [LDR Volume Control OLED firmware:]
https://drive.google.com/open?id=0B7...ENmRXNYUEtySVE
  Reply With Quote
Old 27th October 2018, 02:09 PM   #1099
yurgs is offline yurgs
diyAudio Member
 
Join Date: Jan 2012
Location: Nuremberg, Germany
Default Subwoofer Output

Thanks Neb,
i updated my device with the new code,

but i was also wondering if it is possible to change the function of the output relays slightly:
(using the LDR to switch my Subwoofer output (Relay6) on and off.)


If "Output1" is selectet i would like to switch on R5, and if "Output2 is selectet i would like to switch on both, Relay5 and Relay6.


do you think this works?
__________________
Lenco L75/ Jelco 750L/ Denon DL103 Shibata // Hypnotoad's AD797 Pre // LDR Arduino Controller // chocoholic's Liteamp // Prestigeous 2 Monitor
  Reply With Quote
Old 27th October 2018, 02:12 PM   #1100
zdr is online now zdr  Belgium
diyAudio Member
 
zdr's Avatar
 
Join Date: Nov 2005
Location: Brussels, Beograd
Quote:
Originally Posted by yurgs View Post
Thanks Neb,
i updated my device with the new code,

but i was also wondering if it is possible to change the function of the output relays slightly:
(using the LDR to switch my Subwoofer output (Relay6) on and off.)


If "Output1" is selectet i would like to switch on R5, and if "Output2 is selectet i would like to switch on both, Relay5 and Relay6.


do you think this works?
There is no problem to make it work from the arduino point of view. You need to make sure it works from electrical perspective, as the load impedance will go down when you drive two inputs.
__________________
Neb. [LDR Volume Control OLED firmware:]
https://drive.google.com/open?id=0B7...ENmRXNYUEtySVE
  Reply With Quote

Reply


Arduino based LDR volume and source selection controllerHide 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
LDR Based Input Selection udailey Analog Line Level 27 8th November 2018 04:37 PM
Passive Preamp: Arduino based, remote control, Relay R2R, input selection maxw Analog Line Level 102 17th October 2017 09:05 AM
Another Modified PGA2311 kit with Arduino for volume control and input selection cjkpkg Analog Line Level 28 15th December 2015 10:21 AM
Source select and passive volume for microcontroller-based preamp? vputz Analog Line Level 3 21st July 2012 11:51 AM
WTB: LDR-based volume control / pre jdubs Swap Meet 7 2nd December 2010 02:50 AM


New To Site? Need Help?

All times are GMT. The time now is 02:01 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki