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

Chip Amps Amplifiers based on integrated circuits

Linkwitz lm3886 circuit
Linkwitz lm3886 circuit
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 30th October 2004, 02:18 AM   #1
srfranci is offline srfranci  United States
diyAudio Member
Join Date: Oct 2004
Default Linkwitz lm3886 circuit

Im building his Orion speakers at the moment and am searching for an amp to power them. Stumbled across this
Lm3886 amp circuit
Im in a basic linear circuits course right now, and Im trying to figure out the purpose of some of the parts on his design that I don't normally see on the ones on this forum. BTW, the input to this is an active crossover.

1. The 100pF capacitor across the feedback resistor.

2. The Ci capacitor

3. The 1k 19.6k voltage divider at the input with the 1.5nF capacitor

4. The 220pF capacitor across the input terminals of the opamp

Been browsing the forums for a couple months and havn't seen these, save #4, on other designs. Any ideas?
  Reply With Quote
Old 30th October 2004, 11:28 AM   #2
Mr Evil is offline Mr Evil  United Kingdom
diyAudio Member
Join Date: Aug 2004
Location: Behind you
1) Increases feedback at high frequencies, rolling off frequency response.

2) DC feedback capacitor, ensures gain of 1 at DC, rolling off frequency response at the low end.

3)The 1K resistor at the input forms a low-pass filter along with the 1.5n capacitor. I think the fact that it is also a voltage divider with other the input resistor is a side-effect only.

4)For RF suppression.

I'm sure you'll come across all four being used again, none of them are that uncommon, in fact I'm sure most of them are in the LM3886 datasheet.
  Reply With Quote


Linkwitz lm3886 circuitHide 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
2 LM3876 plus 1 LM3886 using Linkwitz-Riley crossover baboon81 Chip Amps 2 4th March 2007 01:47 AM
lm3886 linkwitz board + ?'s on Eagle srfranci Chip Amps 5 16th February 2006 12:22 AM
Linkwitz's Lm3886 Pluto P/S question akunec Chip Amps 3 8th May 2005 06:57 AM
FYI: Linkwitz has updated his LM3886 design akunec Chip Amps 8 10th April 2005 06:32 PM
Linkwitz eq circuit The Dudster Subwoofers 5 3rd November 2004 05:29 PM

New To Site? Need Help?

All times are GMT. The time now is 07:55 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