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

Class D Switching Power Amplifiers and Power D/A conversion

Input stage for multi-zone amp.
Input stage for multi-zone amp.
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 1st February 2010, 05:56 PM   #1
wsmckenz is offline wsmckenz  United States
diyAudio Member
Join Date: Jan 2010
Location: houston, tx
Default Input stage for multi-zone amp.

So I got my 4 quad power amps from sure electronics. I've been running them on the bench with a 24V/3.5A SMPS and I'm very pleased with the results. I haven't had any of the problems reported by others with the boards. So now I want to run 3 of them together as a multi-room distribution system. Problem is that the amplifiers want less than a volt a 50Kohms and I want to use the line out from my linn majik, which is somewhere are 6-8v @300ohms.

I'm guessing I can do this passively, but I dont really know exactly how. I want to divide that signal between 6 channels and make sure I dont over-drive them amps.

What sort of circuitry would be appropriate here?

  Reply With Quote
Old 3rd February 2010, 12:09 AM   #2
bwaslo is offline bwaslo  United States
diyAudio Member
bwaslo's Avatar
Join Date: May 2006
Location: Portland, Oregon!
To each amp input, run a series resistor of about 10k ohms (any wattage) from the preamp(?) output. Also put a 1k (or so) resistor from each amp input (same point as the 10k goes to) to ground.

Did you need volume control too? (Don't know what a linn majik is). If so, instead for each amp run one 100k resistor from the majik output to the top of a 10k volume control. Ground the bottom of the control and use the wiper to drive the amplifier. There are other ways to do it with fewer separate resistors but resistors are cheap.
  Reply With Quote
Old 3rd February 2010, 12:45 AM   #3
wsmckenz is offline wsmckenz  United States
diyAudio Member
Join Date: Jan 2010
Location: houston, tx
Perfect. Thanks so much. I was using up pads of paper trying to get the perfect attenuator circuit. The Majik is an integrated amplifier, and I'm just pulling the line out from it, so I do have a volume control, but I think I'll just go ahead and put a small dual pot on each amplifier channel.

Click the image to open in full size.

I'm going to have the input rca jacks in the upper right at the back, the pots resistors would all go on the individual bits of prototype boards, then run to the amplifier boards. Do I need to use shielded cable for all of this?

Thanks again,

  Reply With Quote


Input stage for multi-zone amp.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
Sell:MZC-88 WHOLE HOUSE MULTI-ZONE RECEIVER W/KEY-PADS hdmi Swap Meet 2 17th December 2009 12:12 AM
Amps for Whole House Audio : Multi-Room : Muilt-Zone Livin Class D 5 5th January 2008 07:59 PM
Multi-stage amplification sam9 Solid State 2 5th August 2007 05:49 PM
Multi Channel T-Amp Input considerations soundcheck Class D 0 13th November 2006 10:58 AM
simple input stage for amp? AudioGeek Solid State 9 3rd September 2004 10:54 PM

New To Site? Need Help?

All times are GMT. The time now is 06:51 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio