6*lm3886 Bpa
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 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
 14th August 2004, 10:54 PM #1 Tim__x   diyAudio Member   Join Date: Jun 2004 Location: Edmonton area, Alberta 6*lm3886 Bpa Here's my idea. Bridged Parallel, 3 IC's an arm. (based on the BPA-200 in the app note) Driving a 4 ohm load. Each arm seeing a 2 ohm load, each IC seeing a 6 ohm load. Running on 30+30 volt rails (unregulated) With DC servo's running on 15+15 volts regulated that will also power the input buffers Each LM3886 running in inverted configuration. (one inverting buffer, one non-inverting) My math is as follows. 30v+30v=60v 60v-6v(for output dropout) = 54v 54v/4ohms=13.5amps 13.5amps/3ic's=4.5amps peak per IC. Seems reasonable to me, what do you guys think? 4.5amps(peak per IC)/1.414 ~3.2amps RMS per IC I haven't done any power dissipation calculations yet, but with 30+30 rails and a 6ohm load I imagine they'll work fine. Is this doable? If so, should I make one big PCB or perhaps design one small pcb with just a single LM3886 and a servo on it and make six of them? Either way I'll make the input buffers on a seperate board. Edit: With a bridged amp is it necessary to connect the main supply caps to ground or just across the rails?
 15th August 2004, 05:45 AM #2 Mattyo5 diyAudio Member   Join Date: Aug 2002 Location: Farmington, CT http://www.diyaudio.com/forums/showt...8&pagenumber=5 -Matthew K. Olson

 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 Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Site     Site Announcements     Forum Problems Amplifiers     Solid State     Pass Labs     Tubes / Valves     Chip Amps     Class D     Power Supplies     Headphone Systems Source & Line     Analogue Source     Analog Line Level     Digital Source     Digital Line Level     PC Based Loudspeakers     Multi-Way     Full Range     Subwoofers     Planars & Exotics Live Sound     PA Systems     Instruments and Amps Design & Build     Parts     Equipment & Tools     Construction Tips     Software Tools General Interest     Car Audio     diyAudio.com Articles     Music     Everything Else Member Areas     Introductions     The Lounge     Clubs & Events     In Memoriam The Moving Image Commercial Sector     Swap Meet     Group Buys     The diyAudio Store     Vendor Forums         Vendor's Bazaar         Sonic Craft         Apex Jr         Audio Sector         Acoustic Fun         Chipamp         DIY HiFi Supply         Elekit         Elektor         Mains Cables R Us         Parts Connexion         Planet 10 hifi         Quanghao Audio Design         Siliconray Online Electronics Store         Tubelab     Manufacturers         AKSA         Audio Poutine         Musicaltech         Aussie Amplifiers         CSS         exaDevices         Feastrex         GedLee         Head 'n' HiFi - Walter         Heatsink USA         miniDSP         SITO Audio         Twin Audio         Twisted Pear         Wild Burro Audio

 Similar Threads Thread Thread Starter Forum Replies Last Post samsagaz Chip Amps 49 29th June 2008 08:55 PM Mayday Chip Amps 29 29th April 2007 07:10 PM Tombson Chip Amps 99 21st August 2006 01:04 PM rs1026 Chip Amps 11 21st October 2004 11:24 AM

 New To Site? Need Help?

All times are GMT. The time now is 01:10 PM.