diyAudio - Entries for April 28, 2013
Go Back   Home > Forums > Blogs > BuildMeSomething

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

Power Up! - A Low Power Desktop Amp

Posted 28th April 2013 at 04:04 PM by BuildMeSomething
Updated 8th May 2013 at 07:38 PM by BuildMeSomething

The Amp boards arrived Saturday, unfortunately, I was just leaving for work so they'd have to wait. Everything looked OK on them.

Initial power up test was done with both LME49990 in place but only one LME49600 mounted on each channel [PSU used was a modified "The Wire" unit meant for testing the A/B Power Amp at +/-25Vdc, now set at +/-15Vdc. It was getting quite hot as it was dropping 10V per rail]. That went Ok, so the rest of the 49600 were put in place and powered up once more... Again, everything OK.

Measured offset:

Left channel: 27mV
Right channet: 8mV

Foam board speakers are progressing, and will be ordering a heatsink this week also.

Update [13-04-30]: Been a little bit worried about the higher offset value on the left channel, though it's not at a bad level overall. Once the amp has been on awhile, it appears to settle at 25.9 mV.

Made a quick SE input>volume pot AC coupled...
Attached Thumbnails
Click image for larger version

Views:	883
Size:	483.0 KB
ID:	968   Click image for larger version

Views:	455
Size:	476.0 KB
ID:	969   Click image for larger version

Name:	mFonken_2.JPG
Views:	453
Size:	453.8 KB
ID:	984   Click image for larger version

Name:	mFonken_4.JPG
Views:	305
Size:	419.4 KB
ID:	985  
diyAudio Member
Posted in Uncategorized
Views 1183 Comments 6 BuildMeSomething is offline
Hide this!Advertise here!

New To Site? Need Help?

All times are GMT. The time now is 10:46 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2