Re: (ET) FW: Diodes

["Tim Humphrey" <hump evgrin com>]

From radio shack pick up Catalog #: 276-1144; which is a two pack of 1N5404 3 amp diodes.

 

Wire both of these together in parallel in the negative (black) lead with the band pointing towards the car side. Or in the positive (red) lead with the band pointing towards the batt pack.

 

 

 

-----Original Message-----
From: elec-trak-bounces cosmos phy tufts edu
[mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of Jeremy
Gagliardi
Sent: Tuesday, June 03, 2008 10:36 AM
To: elec-trak cosmos phy tufts edu
Subject: (ET) Diodes


This is only slightly related to Elec-traks, but I don't know of any
other forum that can answer my question.

I have a 12V battery pack that charges by plugging into any car-style
power outlet.  The problem is, it allows voltage to go both ways.  If I
forget it's plugged in, and I turn off power from the vehicle, the
battery pack will immediately begin powering the vehicle.  I think this
has damaged a relay on 2 separate occasions.

I want to prevent this behavior by putting 2 diodes on the line so power
only goes 1 direction.  However, I don't know what kind of diode to buy.
I went to Radio Shack and found some very puzzling codes on all of the
diodes and a staff that was less than knowledgable.

Can someone on this list reply to this e-mail in private, and let me
know what kind of diode to buy as well as what code to look for for a
12V, 5Amp system?

--
Jeremy Gagliardi
E20
Potomac, Md

mailto:Jeremy Gagliardi com
http://Jeremy.Gagliardi.com