punch 500x bias voltage - Page 3 - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

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 8th March 2012, 12:46 PM   #21
diyAudio Member
 
Join Date: Jun 2010
I do not have one but i will find it.Is it to limit the current?

I am using a 50w light bult as a limiter.
  Reply With Quote
Old 9th March 2012, 01:02 AM   #22
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
I wouldn't use the lamp. A 12v lamp will blow relatively quickly at anything above about 15v and the amp could easily drive 20+v into the lamp/resistor.

Connect the resistor across the output and do whatever you were doing to make the amp draw current with the bias pot fully counter-clockwise. Does the resistor heat up?

Is there any DC voltage across the resistor when the amp is drawing excessive current?
  Reply With Quote
Old 9th March 2012, 04:27 PM   #23
diyAudio Member
 
Join Date: Jun 2010
I used a 3.4 ohm 30w resistor
I connect it on the bad channel and it is not heating up.
Voltage across the resistor is .8mv
voltage across emitter resistor .3mv
  Reply With Quote
Old 10th March 2012, 07:59 AM   #24
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Did you do the same thing that you did when you had 4.3mv with the bias set fully counter-clockwise?
  Reply With Quote
Old 10th March 2012, 11:50 AM   #25
diyAudio Member
 
Join Date: Jun 2010
yes,
  Reply With Quote
Old 10th March 2012, 09:49 PM   #26
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
I don't have any more suggestions without a scope. It appeared to be oscillating but if the resistor didn't heat up, it probably wasn't oscillating.
  Reply With Quote
Old 12th March 2012, 01:58 AM   #27
diyAudio Member
 
Join Date: Jun 2010
I will just remove the outputs in the bad ch.The owener only need on ch for a sub.
If the resistor was heating up where whould i have to check for the fault?

Thanks for the help
  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
Rockford Fosgate Punch 500x 4 channel seankane Car Audio 48 29th April 2011 10:46 PM
bias current on rockford punch 200.4 Ground Zero Car Audio 2 5th April 2010 05:06 PM
Punch 500aII rail voltage/Voutput brandes.cm Car Audio 11 14th January 2010 12:18 PM
Punch 500x part location? KyferEz Car Audio 10 29th September 2008 11:21 PM
bias voltage vs bias current woodturner-fran Tubes / Valves 3 24th February 2007 11:24 PM


New To Site? Need Help?

All times are GMT. The time now is 06:04 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