Go Back   UG Community @ Ultimate-Guitar.Com > Instruments > Gear Building & Customizing
User Name  
Password
Search:

Reply
Old 10-17-2012, 09:51 PM   #1
Viban
UG's resident bum
 
Viban's Avatar
 
Join Date: Nov 2011
Small amp?

I'm looking to make something fairly small, simple, and portable. I would like something that I could use as a guitar amp but could also play some music through when I'm out in the shed(I work on my tractor and go kart in there). I would like for it to be small, but still sound decent. I don't know if maybe I'm asking too much though. If it is possible could you point me in the right direction as to where to start with it?
__________________
Quote:
Originally Posted by R45VT
Bastards.
Viban is offline   Reply With Quote
Old 10-17-2012, 10:00 PM   #2
end_citizen
New bird. Flightless
 
end_citizen's Avatar
 
Join Date: May 2006
Location: Oklahoma
Are you looking for something that plugs in or something that would use batteries? Are you looking to build a tube amp or solid state amp?
__________________
Back in action, now with brain and spine cyst.

Learn the gist of tube amps
end_citizen is offline   Reply With Quote
Old 10-17-2012, 10:03 PM   #3
Viban
UG's resident bum
 
Viban's Avatar
 
Join Date: Nov 2011
Wall plug, USA voltage, preferably solid state.
__________________
Quote:
Originally Posted by R45VT
Bastards.
Viban is offline   Reply With Quote
Old 10-17-2012, 10:11 PM   #4
end_citizen
New bird. Flightless
 
end_citizen's Avatar
 
Join Date: May 2006
Location: Oklahoma
I've heard people getting good results out of a Class D amp from ebay. Here's a cheap stereo one rated at 25W per channel: http://www.ebay.com/itm/TPA3123-25W...=item416cd4345c

Then you could use any of the preamps turned stompbox at runoff groove for the guitar preamp: http://www.runoffgroove.com/articles.html

You'd have to build a phase inverter to get the most out of both channels, or you could just use one side. Wire up a switch to bypass the preamp when you plug in your MP3 player into it or use the other channel for that purpose.
__________________
Back in action, now with brain and spine cyst.

Learn the gist of tube amps
end_citizen is offline   Reply With Quote
Old 10-17-2012, 10:18 PM   #5
Viban
UG's resident bum
 
Viban's Avatar
 
Join Date: Nov 2011
Which of those pre-amps could I use, it seems like the ones he has that were meant for that kind of thing were the eighteen, the english channel, matchbox, and an omega, I'm thinking I might use the eighteen for the guitar channel at least(given that its applicable) and the omega for the MP3 channel because it seems like it wouldn't color the tone too much.
__________________
Quote:
Originally Posted by R45VT
Bastards.

Last edited by Viban : 10-17-2012 at 10:21 PM.
Viban is offline   Reply With Quote
Old 10-17-2012, 10:27 PM   #6
end_citizen
New bird. Flightless
 
end_citizen's Avatar
 
Join Date: May 2006
Location: Oklahoma
You probably wouldn't need a preamp for the MP3 channel although Jack Orman's Mosfet Boost is a very clean boost that would work if it turns out the volume needs to come up: http://www.muzique.com/schem/mosfet.htm
__________________
Back in action, now with brain and spine cyst.

Learn the gist of tube amps
end_citizen is offline   Reply With Quote
Old 10-17-2012, 10:54 PM   #7
Viban
UG's resident bum
 
Viban's Avatar
 
Join Date: Nov 2011
That's pretty helpful, thanks. But would the eighteen be good as the pre-amp for the guitar channel or does it output too much?
__________________
Quote:
Originally Posted by R45VT
Bastards.
Viban is offline   Reply With Quote
Old 10-17-2012, 11:02 PM   #8
end_citizen
New bird. Flightless
 
end_citizen's Avatar
 
Join Date: May 2006
Location: Oklahoma
You can control the output since it has a volume control at the end. Really, any of the following Runoffgroove projects would work:

Azabache (Fender)
Eighteen (Marshall 18)
The English Channel (Vox AC30)
Ginger (Ampeg Portaflex)
Matchbox (Matchless DC30)
Mockman (Rockman)
Supreau Deux (Supro 16T)
Thor (Marshall Plexi)
Umble (Dumble)
Uno (Mesa/Boogie Mk1)
__________________
Back in action, now with brain and spine cyst.

Learn the gist of tube amps
end_citizen is offline   Reply With Quote
Old 10-17-2012, 11:03 PM   #9
Viban
UG's resident bum
 
Viban's Avatar
 
Join Date: Nov 2011
Well I figured those'd be the ones that would work, this one I'm going with the eighteen, maybe if I like the way it turns out I'll make the dumble or the plexi.
__________________
Quote:
Originally Posted by R45VT
Bastards.
Viban is offline   Reply With Quote
Old 10-17-2012, 11:11 PM   #10
end_citizen
New bird. Flightless
 
end_citizen's Avatar
 
Join Date: May 2006
Location: Oklahoma
It'd be cool if you made it similar to how Egnater does its modules. That way you could swap preamps in and out as you see fit.

As for powering this thing, you've got a couple options. I recommend just using a laptop power supply or a wall wart. Something about 15 volts for the poweramp. And then you could just use a 78L09 voltage regulator to bring the voltage down to 9 volts for the preamp. Although, I'm not sure if there are many wall warts that will supply 4 to 5 amps. I'll look into it real quick.

EDIT: Like I said, it was a very quick look, but I found this supply that would work: http://www.amazon.com/Replacement-A...s=wall+wart+15v
__________________
Back in action, now with brain and spine cyst.

Learn the gist of tube amps

Last edited by end_citizen : 10-17-2012 at 11:12 PM.
end_citizen is offline   Reply With Quote
Old 10-17-2012, 11:16 PM   #11
Culler Amps
Matt Culler
 
Culler Amps's Avatar
 
Join Date: Jun 2012
Location: King, NC
I've actually got a project like this going on now - http://www.ultimate-guitar.com/foru...d.php?t=1565488

The clean preamp may interest you.

Last edited by Culler Amps : 10-17-2012 at 11:18 PM.
Culler Amps is offline   Reply With Quote
Old 10-17-2012, 11:17 PM   #12
Viban
UG's resident bum
 
Viban's Avatar
 
Join Date: Nov 2011
I might do that, find a way to wire it in with a something like a usb port where I could just slide them in and out of a compartment. It would probably not take much more work.
__________________
Quote:
Originally Posted by R45VT
Bastards.
Viban is offline   Reply With Quote
Old 10-17-2012, 11:46 PM   #13
end_citizen
New bird. Flightless
 
end_citizen's Avatar
 
Join Date: May 2006
Location: Oklahoma
Quote:
Originally Posted by Viban
I might do that, find a way to wire it in with a something like a usb port where I could just slide them in and out of a compartment. It would probably not take much more work.


USB sounds like a good idea since you'll really only have 3 connections going to the poweramp - Positive voltage, Ground, and Signal.
__________________
Back in action, now with brain and spine cyst.

Learn the gist of tube amps
end_citizen is offline   Reply With Quote
Old 10-17-2012, 11:47 PM   #14
Viban
UG's resident bum
 
Viban's Avatar
 
Join Date: Nov 2011
Wouldn't you need a ground for the power circuit, and then one of the signal? Or do you just tie the two together? Either way I figured it'd be perfect seeing as USB is configured pretty much the same way.
__________________
Quote:
Originally Posted by R45VT
Bastards.
Viban is offline   Reply With Quote
Old 10-17-2012, 11:49 PM   #15
end_citizen
New bird. Flightless
 
end_citizen's Avatar
 
Join Date: May 2006
Location: Oklahoma
You can usually tie signal ground and power ground together.
__________________
Back in action, now with brain and spine cyst.

Learn the gist of tube amps
end_citizen is offline   Reply With Quote
Old 10-17-2012, 11:57 PM   #16
Viban
UG's resident bum
 
Viban's Avatar
 
Join Date: Nov 2011
Quote:
Originally Posted by end_citizen
You can usually tie signal ground and power ground together.

Good things to know right there, could really help clean up my wiring a whole load.
__________________
Quote:
Originally Posted by R45VT
Bastards.
Viban is offline   Reply With Quote
Reply


Thread Tools Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump



All times are GMT -4. The time now is 04:45 PM.

Forum Archives / About / Terms of Use / Advertise / Contact / Ultimate-Guitar.Com © 2014
Powered by: vBulletin Version 3.0.9
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.