spacer spacer spacer spacer

12 to 6v regulator 15a?

Post ReplyPost New Topic
< Prev Topic Next Topic >
Member - Posts: 13
Member spacespace
Joined: August 25, 2012
Location: North Dakota, United States
Posted: September 28, 2013 at 3:21 PM / IP Logged  
Working on converting a old truck from 6V to 12V.
I dont know what the amperage draw is from the blower motor. The truck is at a remote location. so I was looking at designing a regulated supply capable of providing at most 15A at 6V.
Having a hard time locating a schematic that uses common regulators I have in stock, that are capable of that high current rating.
I envision three separate circuits, 2 5A circuits with one 15A. I will fuse them and have an LED before the fuse to indicate a intact fuse.
Not alot on this truck thats needed. Should cover everything.
I am not real familar with paralleling regulators, but is it possible to use multiple 317's to accomplish this?
Does anyone have a schematic handy for this? Or references I can look at to lead me in the right path?
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: September 30, 2013 at 11:55 PM / IP Logged  
You mean a LED across or AFTER the fuse to show it's intact?
2N3055s etc are used to beef up regulator outputs. You should find circuits via google etc, typically with a 0.1 Ohm resistor on each 3055 output to force current sharing.
But I think that's overkill, plus it's 120W of 3055 heat to dissipate (must not touch GND or +12V). For a fan (especially if single speed) a 100W 0.5 Ohm (for 15A; 0.7R for 10A etc) should do.
If going the regulated route I'd consider the newer switched-mode regulators (dc-dc converters). They are typically well over 80% efficient, often 95% etc (hence under 20W heat 80% @ 15A), though it may be trickier finding something 15A capable (maybe a modified Current Logic 12V/24V to 5V, Step-down, 20A, 100W?
For low currents (2A, 3A etc) there are various cheapish "step-down" modules based on the LM2576, LM2577 etc, or see Current Logic.

Sorry, you can NOT post a reply.
This topic is closed.

  Printable version Printable version Post ReplyPost New Topic
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

Follow Follow on Facebook
Tuesday, June 15, 2021 • Copyright © 1999-2021, All Rights Reserved Privacy Policy & Use of Cookies
Disclaimer: *All information on this site ( ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

Secured by Sectigo spacer spacer spacer
Top spacer spacer