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

hard wire lm3875 and heat on resistor
hard wire lm3875 and heat on resistor
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 28th November 2012, 03:11 AM   #1
imaginarytime is offline imaginarytime  United States
diyAudio Member
 
Join Date: Oct 2012
Default hard wire lm3875 and heat on resistor

Hey everybody.

I'm working on an lm3875 build that's held together by some protoboard, but basically hard wired (if that's what we call it.)

Anyway, I think I'm off to a cool start, but as I put it together, the resistor between pins 3 and 8 is going to be held to the chip. Seems that if the other side is going to be screwed to a heat sink, the resistor will be getting pretty hot.

This one's a carbon comp (those caddocks at ~$4.00 a pop might be worth it, but I need to hear the $0.50 alternative.) In particular an ohmite little demon. The data sheet doesn't mention anything about temperature tolerances in this context.

Are we worried about this?
  Reply With Quote
Old 28th November 2012, 12:45 PM   #2
Robert Kesh is offline Robert Kesh  Wallis & Futuna
diyAudio Member
 
Robert Kesh's Avatar
 
Join Date: Oct 2012
Quote:
Originally Posted by imaginarytime View Post
Hey everybody.

I'm working on an lm3875 build that's held together by some protoboard, but basically hard wired (if that's what we call it.)

Anyway, I think I'm off to a cool start, but as I put it together, the resistor between pins 3 and 8 is going to be held to the chip. Seems that if the other side is going to be screwed to a heat sink, the resistor will be getting pretty hot.

This one's a carbon comp (those caddocks at ~$4.00 a pop might be worth it, but I need to hear the $0.50 alternative.) In particular an ohmite little demon. The data sheet doesn't mention anything about temperature tolerances in this context.

Are we worried about this?
Bake them, then measure their resistance. Or use something sensible. Or over rate the heat sink so it doesn't get hot.
  Reply With Quote

Reply


hard wire lm3875 and heat on resistorHide 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
Hard wire as per schematic! jerryo Solid State 18 3rd April 2010 05:32 PM
Hook-up Wire for Hard Wiring a Power Amp? vdi_nenna Solid State 10 1st April 2008 06:07 PM
LM3875 Heat Sink Issues cjv998 Chip Amps 16 23rd July 2007 10:21 AM
LM3875 heat sink help. CJ Paul Chip Amps 4 10th March 2006 09:14 PM
Used heat sinks, power resistor sale. gnomus Swap Meet 5 24th March 2002 02:20 AM


New To Site? Need Help?

All times are GMT. The time now is 02:12 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki