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

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

Simple decoupling circuit for DACs?
Simple decoupling circuit for DACs?
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
Thread Tools Search this Thread
Old 25th November 2005, 07:57 AM   #1
eVITAERC is offline eVITAERC  Canada
diyAudio Member
Join Date: Aug 2005
Default Simple decoupling circuit for DACs?

(cross-posted form Power Supply Design, because nobody goes there)

Hi guys,

I'm planning an ultra-portable stereo designed to hook up to a laptop. The plan is to have the DAC (I'm using diyparadise's Monica 2) and a custom class-D amp run off the same 12V switching power supply that the laptop is using, while the laptop runs in power-saving mode operated by a remote.

The general circuit tests out, and everything can run without hitting current output limits on the SMPS. However the problem is that there is inavoidably a lot of noise in the PS, whether it's from the class-D or the laptop or the PSU itself. Is there a simple LC-decoupling/bypassing circuit that I can use to decouple the entire noise-sensitive DAC without lowering the supply voltage? What would be suitable values?

Thanks in advance
  Reply With Quote
Old 25th November 2005, 10:16 AM   #2
bocka is offline bocka  Germany
diyAudio Member
Join Date: Jul 2003
Location: Hannover
Have you made some measurements about the noise on the output of the class D amp or the DAC? Is the noise present at the DACs output first or on the class D amp? Did you use a star topology for grounding?

Although a SMPS creates (much) more noise than a standard linear regulator noise problems are most often grounding problems as the PSRR of the chips is high enough to supress power supply related noise.
  Reply With Quote


Simple decoupling circuit for DACs?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
Looking for a simple circuit Skitch72 Tubes / Valves 19 12th August 2009 07:31 PM
Are Polystyrene caps suitable for digital circuit decoupling/bypassing? homemade Parts 8 29th September 2006 03:37 PM
Help me with simple circuit valterdaw Car Audio 2 22nd August 2006 07:15 AM
Simple decoupling circuit for DACs? eVITAERC Power Supplies 0 23rd November 2005 07:03 AM

New To Site? Need Help?

All times are GMT. The time now is 11:22 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio