Fusing a Battery Supply? - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

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 31st January 2006, 08:11 PM   #1
mourip is offline mourip  United States
diyAudio Member
 
Join Date: Apr 2004
Location: Washington, DC
Default Fusing a Battery Supply?

Hi,

Have any of you who have put one of the various T-Amp flavors into a new chassis, and used an SLA battery, added a fuse to the supply?

Thanks,

Paul
  Reply With Quote
Old 1st February 2006, 11:28 AM   #2
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Kona, Hawaii
Blog Entries: 4
Yes, I have. IAnd have never blown a 2 amp fuse, but you could use 3A if you thik 2 is too small.

A fuse is a good thing, just don't make it too big.
__________________
Take the Speaker Voltage Test!
  Reply With Quote
Old 1st February 2006, 12:39 PM   #3
dnsey is offline dnsey  United Kingdom
diyAudio Member
 
Join Date: Mar 2004
Location: Shropshire, England
I'd considera fuse essential - as near as possible to the battery. Thre's a lot of energy stored in even a small SLA at low internal resistance, quite enough to start a fire under fault conditions.
  Reply With Quote
Old 1st February 2006, 01:02 PM   #4
mourip is offline mourip  United States
diyAudio Member
 
Join Date: Apr 2004
Location: Washington, DC
Thanks for the replies. Since no one ever mentions it I had assumed that folks did not consider it necessary with a battery.

I already had one mishap with my modded T-Amp. I inserted the battery charger adaptor into the chassis female mount and it bent the hot pin to the chassis. The result was that I let a lot of smoke out of the amp and the little battery pumped its heart out in a brilliant display of excess. Luckily the internal wiring acted as a large low value resistor and bought me enough time to yank the adaptor out before a real fire started. The amp board was unharmed.

Fuses are good...
  Reply With Quote
Old 1st February 2006, 01:19 PM   #5
diyAudio Member
 
gfinlayson's Avatar
 
Join Date: Jan 2006
Location: Aylesford, Kent, England
Lead acid batteries can discharge a huge amount of energy in a very short time.

There are lots of accounts of accidents occurring with vehicle batteries and spanners. The average vehicle battery can deliver several hundred amps when shorted making it a very effective DC arc welder.
  Reply With Quote
Old 2nd February 2006, 10:22 PM   #6
pburke is offline pburke  Germany
diyAudio Member
 
Join Date: Nov 2003
Location: Madison Wisconsin
I recently taught my kids about how strong battery current can be by shorting out a small 7.2aH SLA battery with a piece of CAT5 wire - instant smokage and red-hot melting copper...

I use a 5amp fuse in my battery powered DDDAC, which draws about 1 amp - it has saved a few components quite frequently. Just last week I bought a new box of 5amp automotive fuses. I can't find them any smaller, but I'm putting this fuse only in there for the "bonehead mistake protection"

Peter
  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
C- Battery Supply dsavitsk Tubes / Valves 4 14th May 2008 10:08 PM
Battery supply. harwoodspark Analog Line Level 10 23rd December 2007 06:28 PM
What happens if the battery supply is off balance ? Will Chip Amps 3 6th October 2006 05:39 PM
Battery Power Supply PH Analogue Source 4 3rd May 2005 01:03 PM
Battery Supply Help. RichardJones Solid State 4 11th June 2003 03:23 PM


New To Site? Need Help?

All times are GMT. The time now is 11:57 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