Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 09-19-2009, 09:00 PM   #1
Newbie
 
Join Date: Sep 2009
Posts: 2
Share |
Question

Reducing voltage from 9v to 3v


I've got a project idea in mind. I want to make a simple, effective wireless system for a guitar using 2 walkie-talkies (audio fidelity isn't a huge issue for me, so this seems like a viable option). I'd like to connect the "receiver" to my universal power supply on my pedalboard. However, the walkie-talkie runs on 2 1.5v batteries, and the power supply outputs 9v. What would be an effective way to reduce the voltage in order to use the walkie-talkie with the power supply?

Thanks,
Alex

guitargeek is offline   Reply With Quote
Old 09-19-2009, 09:33 PM   #2
Member
 
300zx's Avatar
 
Join Date: May 2009
Location: Florida
Posts: 630
Post

Reducing voltage from 9v to 3v


Don't know if any info will help you in this thread Dangermouse asked the same Question 9v DC to 3v DC

300zx is offline   Reply With Quote
Old 09-19-2009, 10:27 PM   #3
Idiot Emeritus
 
Join Date: Mar 2008
Location: Fernley, Nevada (near Reno)
Posts: 1,603
Default

Reducing voltage from 9v to 3v


You'd need an actual voltage regulator in this case. The load will vary, so a simple resistor won't work.

A Fairchild FAN1587AT33 will work. It's 4.6 to 12 volts input, and 3.3 volts out. Up to 3 amps. Comes in a TO-220 case, so it's easy to mount, and a cinch to connect. They cost around $2.

You'll also need a suitable heatsink.



Rob
micromind is offline   Reply With Quote
Old 09-19-2009, 11:04 PM   #4
Electrical Contractor
 
kbsparky's Avatar
 
Join Date: Sep 2008
Location: Delmarva
Posts: 3,368
Default

Reducing voltage from 9v to 3v


Why not get a wireless mic and receiver set? The batteries should last much longer than hijacking a set of walkie-talkies.
__________________
-KB

Life is uncertain -- eat dessert first!!
kbsparky is offline   Reply With Quote
Old 09-19-2009, 11:44 PM   #5
Newbie
 
Join Date: Sep 2009
Posts: 2
Default

Reducing voltage from 9v to 3v


300zx: I saw that thread, but it didn't help me much, so I figured I'd sign up for this forum & just start a new thread.

micromind: Thanks! That seems like it'll work, hopefully. There's an electrical shop not too far from me; sometime next week I'll stop in & see if they've got that. What would make a suitable heatsink? I have a few I pulled from old computers, but I'm not sure if they'd work or not.

kbsparky: The short answer is, I'm broke. But, more specifically, I like building stuff like this myself sometimes. I've built instruments before, and I just got done building a speaker cabinet from extra parts, but I'm new to more advanced (i.e: any kind of) electrical work like this, so I figured this'd be a good place to look. That, and it'd be funny to tell people what my wireless system is; I already get plenty of funny & confused looks when I try to explain my live setup :D
guitargeek is offline   Reply With Quote
Old 09-20-2009, 07:00 AM   #6
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Default

Reducing voltage from 9v to 3v


This is adjustable
http://www.national.com/mpf/LM/LM317.html

Depending on the current draw you can also use a 3.0v +/- 5% Zener diode, or 3 or 4 junk box silicon diodes in series to act as a Zener. You then need a dropping resistor.
Yoyizit is offline   Reply With Quote
Old 09-20-2009, 10:29 AM   #7
Idiot Emeritus
 
Join Date: Mar 2008
Location: Fernley, Nevada (near Reno)
Posts: 1,603
Default

Reducing voltage from 9v to 3v


A heatsink that's about 2" X 2" should work. If the existing mounting holes won't work, feel free to drill a new one.

I can't remember if this chip has an isolated mounting tab or not. If it doesn't, and the chip is mounted directly to the heatsink, the heatsink will be at DC-. This should be OK in your case, but if it needs to be isolated, just get a TO-220 mounting kit. Otherwise, just bolt it straight to the heatsink.

Rob

micromind is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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
high voltage fire alarm jungboklee Electrical 3 01-26-2009 09:07 PM
Low voltage box question WShawn Electrical 7 08-19-2008 06:22 AM
2 - 900w tansformers on a 15A circuit? tonyBagadonuts Electrical 19 07-20-2008 07:15 PM
Voltage Drop Issues sushiboy Electrical 12 04-03-2008 09:01 PM
Low voltage to vacuum l.schrankel@comcast.net Electrical 2 03-04-2007 09:38 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.