Go Back   Home > Forums > Amplifiers > Chip Amps

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
Reply
 
Thread Tools Search this Thread
Old 18th May 2003, 07:59 PM   #1
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
Join Date: Feb 2003
Location: Somerset, SW England
Default Is this motor-boating?

I have just built some new speakers to go with my Gainclones. They use a full-range driver with no crossover.

After one and a half tracks, it sounded as though a sport cars was being driven out of the right hand speaker (my GC's are monoblocs).

Is this motor-boating? Or what else may be causing it? Is the lack of resistance by not using a crossover the problem but if so why only one channel?
__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  Reply With Quote
Old 18th May 2003, 08:07 PM   #2
Duo is offline Duo  Canada
diyAudio Member
 
Duo's Avatar
 
Join Date: Jun 2002
Location: Victoria, BC, Canada
Send a message via ICQ to Duo
It seems your problem is with a reactive load or something similar. It's weird that it only motorboats in one channel.

I have made a few amps before and found them to motorboat easily on certain speakers and be fine on others.

Are you sure everything is exactly the same for both channels? Speaker leads, speakers, amps, parts?

I would look into some filtering like a zobel network, maybe, some more negative feedback.... Less reactive speaker setup.

I can't shed a great deal of light on the situation, but there are many experienced people on this forum that can.

Just wait and I'm sure you'll get some good answers.
__________________
-- Duo, W1ngs, VA7MON, and lesser known handles. --
-- http://www.w1ngselectronics.com -- My Work and Projects --
  Reply With Quote
Old 18th May 2003, 08:13 PM   #3
diyAudio Member
 
JOE DIRT®'s Avatar
 
Join Date: Apr 2003
Location: Brantford, ON
try a .5 ohm 5 watt resistor on each speaker and get back to us
  Reply With Quote
Old 18th May 2003, 09:05 PM   #4
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
Join Date: Feb 2003
Location: Somerset, SW England
Hi guys, thanks for the replies.

I was using a single PSU before and have gone back to one PSU per channel and it's OK! I remember KYW saying something along the lines of using separate supplies with the inverted design but it worked OK with my other speakers.
__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  Reply With Quote
Old 19th May 2003, 02:15 PM   #5
zeno is offline zeno  Europe
diyAudio Member
 
Join Date: Aug 2002
Location: Belgium
Quote:
Originally posted by Nuuk
Hi guys, thanks for the replies.

I was using a single PSU before and have gone back to one PSU per channel and it's OK! I remember KYW saying something along the lines of using separate supplies with the inverted design but it worked OK with my other speakers.

What speakers did you build?

I am experimenting a bit with Jordan JX92S full range chassis.

Just curious which full range chassis you are using in your new speakers!

Marc
  Reply With Quote
Old 19th May 2003, 05:16 PM   #6
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
Join Date: Feb 2003
Location: Somerset, SW England
Quote:
What speakers did you build?
Hi Marc,

I'm not using anything special, just a 10UKP type that you can see HERE

I'm just playing around with a concept of a chassis to hold the driver and a 'skin' of polystyrene to make a three sided open baffle. It's strange having a speaker over a metre high that you can lift off the ground with one hand!

I'll be doing a full write up on my web site as soon as time allows.
__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  Reply With Quote

Reply


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Help required for using a FDD motor as a turntable motor. binspaul Analogue Source 5 13th May 2009 03:59 AM
Lambda motor vs. XBL^2 motor vs. any other motor Thinkcat Subwoofers 16 23rd December 2008 06:23 AM
DIY TT: motor, motor PS, platter speed measurements dice45 Analogue Source 52 9th May 2006 01:07 PM
WTB TT motor IZHAKKATZ Swap Meet 7 9th February 2005 08:25 PM
dc motor dionysio Analogue Source 1 3rd May 2004 01:09 PM


New To Site? Need Help?

All times are GMT. The time now is 11:17 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2