Are you using the resistor? - diyAudio
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 14th May 2003, 02:37 AM   #1
diyAudio Member
 
Ricren's Avatar
 
Join Date: Nov 2001
Location: Buenos Aires
Default Are you using the resistor?

Hi folks,
After all that's been written about GCin different incarnations, I have one question:

Are you using the resistor at the output, or some kind of zobel network or perhaps nothing?

I've built some prototipes that seem to work fine with short speaker cables, but now that I'll build a couple of clones to use as surround amps I'm not shure about stability with long speaker cables, let's say 7 or 8 meters.
What you say?

cheers

Ric
  Reply With Quote
Old 14th May 2003, 03:17 AM   #2
diyAudio Member
 
Join Date: Oct 2001
from my listening experience:
adding 0.22 Ohm resistor improve speed and dynamic,
without it, the sound became soft, maybe muddy.
  Reply With Quote
Old 16th May 2003, 01:26 PM   #3
Banned
 
Join Date: Mar 2003
Location: Lisbon, Portugal
Default Re: Are you using the resistor?

Quote:
Originally posted by Ricren
Hi folks,
After all that's been written about GCin different incarnations, I have one question:

Are you using the resistor at the output, or some kind of zobel network or perhaps nothing?

I've built some prototipes that seem to work fine with short speaker cables, but now that I'll build a couple of clones to use as surround amps I'm not shure about stability with long speaker cables, let's say 7 or 8 meters.
What you say?

cheers

Ric
I use the resistor.
It improves stability of the chip for a wider range of cables.
I don't think you need a zobel network.
The series resistor should be as close to the output pin as possive, like in any op-amp.
Yes, this is a power op-amp.
  Reply With Quote
Old 16th May 2003, 04:02 PM   #4
diyAudio Member
 
Ricren's Avatar
 
Join Date: Nov 2001
Location: Buenos Aires
Default Values?

What would be the prefered ohms/watts values for the resistor?


cheers

Ric
  Reply With Quote
Old 16th May 2003, 04:18 PM   #5
Banned
 
Join Date: Mar 2003
Location: Lisbon, Portugal
I use 0.22 ohms, 4 watts.
4 or 5 watts is more than enough.
  Reply With Quote
Old 16th May 2003, 05:31 PM   #6
elizard is offline elizard  Canada
diyAudio Member
 
Join Date: Mar 2003
Location: Winnipeg, MB
Send a message via MSN to elizard
forgive me, but how would you go about connecting the resistor?
would it be between the +/- of the speaker outs?
  Reply With Quote
Old 16th May 2003, 06:52 PM   #7
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
It would be between output pin of a chip and a binding post in the amp.
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 16th May 2003, 07:32 PM   #8
diyAudio Member
 
Ricren's Avatar
 
Join Date: Nov 2001
Location: Buenos Aires
Default I remember....

Several years ago I read an article in a well regarded magazine about using very low value resistors in the speaker path of certain SS amplifiers to get better sound. They were talking about values up to 1 ohm.

Ric
  Reply With Quote
Old 16th May 2003, 08:13 PM   #9
diyAudio Member
 
Join Date: Mar 2003
Location: Ohio
Default Recommended Resistor Type for Output?

Any preference for type (thick film, wirewound, etc.) of resistor in this application? Mills? Caddock? other choice?
  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
Which resistor type for emitter resistor? sajti Parts 25 8th April 2009 06:12 AM
What resistor should I use? Rob11966 Tubes / Valves 1 2nd March 2009 09:52 AM
Why this resistor? Shel-e-bean Everything Else 28 4th August 2006 04:57 AM
Help with Resistor Please saabie22 Parts 5 2nd February 2005 09:39 PM
screen-plate resistor and grid leak resistor metebalci Tubes / Valves 4 26th February 2004 03:18 AM


New To Site? Need Help?

All times are GMT. The time now is 12:58 AM.


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