Quad 303 - questions and thoughts - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

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 7th February 2013, 07:05 PM   #1
MikeVou is offline MikeVou  United Kingdom
diyAudio Member
Join Date: Oct 2012
Location: United Kingdom
Default Quad 303 - questions and thoughts

Hello, I am new as a poster to this forum, and have found the information on it very useful.

I am considering building a copy of the Quad 303 circuit, the appeal being its simplicity and bomb-proof reputation. I have constructed a simulation in LTSpice, and am trying to establish the size of heatsink that will be needed for the output transistors. LTSpice is telling me that the dissipation in TR1 and TR2 is 33W peak, average 13.2W. Is that about right? If so, this seems to imply a total heatsink requirement per channel of about 1.85 degreesC/W to cope with this average dissipation.

Sorry to be asking such a basic question on this forum. It's proved difficult to find a clear description of how to work out the dissipation, and maths is definitely not my subject!

Thanks in advance to anyone with any ideas.

  Reply With Quote


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
Quad 303 Upgrade - How far is too far? HiFiWill Solid State 13 28th March 2013 02:19 PM
Quad 303 problem Intheloft Solid State 2 17th April 2010 01:57 PM
quad 303 Crackling tony_ives Solid State 7 21st March 2008 09:10 PM
QUAD 303 transistors TonyF Solid State 17 14th September 2004 02:23 PM
Quad 303 screws cpu_bach Solid State 6 4th August 2004 01:42 PM

New To Site? Need Help?

All times are GMT. The time now is 06:23 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2