Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Chip Amps Amplifiers based on integrated circuits

Battery Powered Guitar Amp help
Battery Powered Guitar Amp help
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 23rd November 2006, 01:56 PM   #1
filholder is offline filholder  United Kingdom
diyAudio Member
 
Join Date: Jan 2005
Location: london
Default Battery Powered Guitar Amp help

Hi,

I am trying to build a guitar amp for a friend. He is a professional busker here in London and wants a decent quality preamp (maybe with FX), amp and loudspeaker unit all in one. The project is making me scratch my head quite a lot i have to say. The unit needs to be run off 1 or 2 SLA battery and needs to run as such for at least 4 hrs a day. For the power amp section I am thinking either a t-amp or a LM3875 but the preamp and fx are causing a lot of head scratching. I have found a decent preamp on ESP but it requires a -/+ 15v supply, if i tied together two SLA i guess i could get a -/+ 13.8v supply. If i did this could i also send separate dual parallel wiring from he batteries to power the power amp section?

The unit also needs a separate CD in and i was thinking about using a high efficiency full range driver as final output.

Any idea, links or help very much appreciated

Phil
  Reply With Quote
Old 23rd November 2006, 02:30 PM   #2
karma is offline karma  Canada
diyAudio Member
 
karma's Avatar
 
Join Date: Feb 2003
Location: hamilton,ontario
i get about 2 hours with 4 cells with one of my chipamps
Attached Images
File Type: jpg 000_0825.jpg (38.7 KB, 160 views)
  Reply With Quote
Old 23rd November 2006, 02:40 PM   #3
I_Forgot is offline I_Forgot  United States
diyAudio Member
 
I_Forgot's Avatar
 
Join Date: Jan 2005
Location: Phoenix, Az.
I would think you'd want to go class D to maximize battery life and minimize size/weight. TI makes a bunch of class D amp ICs and has demo boards available for not too much $.

I_F
  Reply With Quote
Old 23rd November 2006, 02:44 PM   #4
DigitalJunkie is offline DigitalJunkie  United States
diyAudio Member
 
Join Date: Apr 2003
Location: Portland,Oregon
Send a message via AIM to DigitalJunkie
Well,seeing as it's battery powered..
I'd go with an efficient amp (Class-D) that has just enough power to do the job,and a nice efficient speaker to make the best use of the power from the amp.

No need to burn 20W of battery power,when you can do it with 10W,and play for twice as long!
  Reply With Quote
Old 23rd November 2006, 02:57 PM   #5
CarlosT is offline CarlosT  United States
diyAudio Member
 
Join Date: Oct 2006
How about a pedal-powered dynamo so that he can jam as long as he wants?

No...really...now the whole thing needs to work off a battery? What...is he a street vendor?
  Reply With Quote
Old 23rd November 2006, 03:02 PM   #6
CarlosT is offline CarlosT  United States
diyAudio Member
 
Join Date: Oct 2006
Does your pre-amp have any gain? Most preamp chips out there are rated for a MAXIMUM supply voltage of 18V or 15V...it doesn't necessarily mean that they wouldn't run on less like 13.8V. BTW...13.8V is very optimistic...that will surely go down as the show goes on especially during the Voodo Chile Hendrix solo

In my short excursions looking at pre-amp basic building block chips, I liked the SSM2141 and INA134 although I've seen entire pre-amps contained in one IC as well.
  Reply With Quote
Old 23rd November 2006, 03:20 PM   #7
filholder is offline filholder  United Kingdom
diyAudio Member
 
Join Date: Jan 2005
Location: london
Hes a professional busker on the London underground. Make very good money at it too.

That why he wants something better than the usual crap that out there. The best thing he can buy is a Crate Limo, they cost about 300 and he has 2 constantly on rotation as one come back from the repair shop the next next goes in. Also the sound is quite shite, no idea what chip are in them , they quote 50 watt and 10% THD so probably more like 25 clean.

I was thinking with and efficient full range and something like an Amp 3 it might be loud enough and his battery life should be better

Just to make sure i can run of 2 batteries a set of wires in series for the +/- 12v for the preamp and a parallel set for the t-amp?
  Reply With Quote
Old 23rd November 2006, 03:54 PM   #8
filholder is offline filholder  United Kingdom
diyAudio Member
 
Join Date: Jan 2005
Location: london
Thanks for hte help so far, at least i now that the Overture chip are a no go.
  Reply With Quote
Old 25th November 2006, 01:52 PM   #9
filholder is offline filholder  United Kingdom
diyAudio Member
 
Join Date: Jan 2005
Location: london
has anyone got any guitar preamp or fx cicuits i might have a look at?
  Reply With Quote
Old 28th November 2006, 12:55 AM   #10
Minion is offline Minion  Canada
diyAudio Member
 
Join Date: May 2006
Location: Cowican Bay , vancouver island
If you are looking for Guitar effect circuits take a look here:

http://www.diystompboxes.com/smfforum/index.php


I have used a couple circuits found here and integrated them directly into my Guitar amp, The good thing about most of these circuits is that since they are for Pedals they will run off of a single Supply Voltage (+9v) and some will run even better at higher Voltages.....

I recently built a really simple Guitar Overdrive/Booster pedal that sounded great and integrated really easilly into my Guitar amp design.....If you are interested I can post the schematic and PCB for you....


Cheers
  Reply With Quote

Reply


Battery Powered Guitar Amp helpHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Battery powered tube preamps/effects (guitar) pbholmen Instruments and Amps 11 11th August 2009 07:56 PM
Building a battery powered guitar mp filholder Instruments and Amps 2 27th November 2006 03:27 PM
Worth while battery powered guitar amp MrGuitardeath Instruments and Amps 51 1st December 2005 11:23 AM


New To Site? Need Help?

All times are GMT. The time now is 08:01 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki