request help for mini amp project - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 2nd March 2011, 03:23 AM   #1
diyAudio Member
 
Join Date: Feb 2011
Default request help for mini amp project

I'm trying to build an amp small enough to attach to my acoustic guitar. Here's what I'm thinking: I'd like to use about a 3" speaker and enclosure for the amp and assembly. Then i'd like to figure out how to make a small switch to turn on a delay effect. I reckon i'm really probably getting ahead of myself and over-extending my very meager knowledge of what i'm doing, but i'd like to get thoughts on how or if it might work. I'm not really looking for specific details or anything. thanks in advance.
  Reply With Quote
Old 2nd March 2011, 07:23 AM   #2
diyAudio Member
 
jackand08's Avatar
 
Join Date: Oct 2008
Location: England
It depends on how much wattage you want, more wattage is more power but also means that you may need a higher power (mains) supply instead of keeping it safe using a battery. Also, if the speaker you are using is not very efficient at converting this power into sound waves, power will be wasted and it will not sound louder. Basically, a 1 watt amplifier with an efficient speaker can be louder than a 3 watt amp with an inefficient speaker.

The main question to determine how much power you need is what the amp is going to be used for. Obviously with a 3" speaker you can hardly gig with it so I'm assuming that what you want is a small practice amp of some kind. The best way of doing this is probably to use an IC (integrated circuit) to do the amplification. The first IC that springs to mind for me is the LM386. This has an output power of around 1 watt and can be battery powered so it would be safe to use and build. I'm fairly certain that there are kits using this IC out there so its best having a search round to see what you can find.

With regards to a switch to route the signal to an effect, is the effect an external pedal or are you planning to include the effect in the enclosure?

Also, you may need a preamplifier to boost the signal coming out of your acoustic guitar as the gain of the main amplifier may not be high enough. Again, there are plenty of circuits out there for you to have a look at, probably along with some kits that do the same thing.
__________________
Jack
"Near enough is good enough, so good enough is best"
  Reply With Quote
Old 2nd March 2011, 08:49 AM   #3
diyAudio Member
 
Join Date: Dec 2008
Location: Victoria, BC
What are you trying to accomplish?
Do you want to physically attach the amp to the guitar, or connect with a cable?
Does your acoustic guitar have a pickup installed already?
You are going to need substantial battery power to produce enough audio to compete with a decent steel string acoustic, BTW.
  Reply With Quote
Old 2nd March 2011, 12:11 PM   #4
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
An acoustic guitar has an acoustic output.
Why do you need a poor copy of that and not at a higher volume?
__________________
regards Andrew T.
  Reply With Quote
Old 3rd March 2011, 01:47 AM   #5
diyAudio Member
 
Join Date: Feb 2011
Default elaboration

The point is to change the nuance of the guitar using the amp to add a little spice to the sound. So what i'd hopefully end up with is the acoustic sound layered with the small amp with some distortion. And it would be neat to have the delay right there in the enclosure; how feasible or expedient that would be, I don't know. I'm just trying to bounce ideas.

I'd looked into some LM386 chip builds, but my skills at reading the schematics are so poor what I ended up with wouldn't even make noise. I understand the basics, but all the schematics i see are all so complicated i can't understand them. and they all look different to me. So maybe if someone could direct me to a good place to learn to read them, that could be helpful too. Thanks in reply and advance.
  Reply With Quote
Old 3rd March 2011, 03:44 PM   #6
maurycy is offline maurycy  United States
diyAudio Member
 
Join Date: Dec 2005
Location: NJ
How you are going to connect the amp to the guitar? Is your guitar acoustic-electric or you are going to add pickups?

Hitachi HA13118 will give you about 18W mono with gain of about 55dB. I am building one for my electric guitar.

And it comes as a kit:
Kit 105 18W amplifier
  Reply With Quote
Old 3rd March 2011, 04:51 PM   #7
LAJ is offline LAJ  United States
diyAudio Member
 
Join Date: Mar 2008
Location: Atlanta Ga. USA
I'd go with a 6" speaker and an LM386 chip. The larger speaker moves more air and thus is louder.
  Reply With Quote
Old 4th March 2011, 01:11 AM   #8
diyAudio Member
 
Join Date: Feb 2011
@maurycy,

what do you think about working in a delay component into that?
  Reply With Quote
Old 4th March 2011, 04:46 PM   #9
maurycy is offline maurycy  United States
diyAudio Member
 
Join Date: Dec 2005
Location: NJ
I am afraid that I can't help you with delay. Do not have enough skills to modify the circuit. Maybe somebody else can provide an update to the circuit.
  Reply With Quote
Old 4th March 2011, 06:11 PM   #10
diyAudio Member
 
Join Date: Feb 2011
Is there a better place to go with questions of that nature? and do you know of a good place or good way to learn how to read the schematics that come with the kits?
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Dual hi-vi mini project BionicSniper Multi-Way 23 7th August 2008 05:06 PM
mini Zen5 & JBOZ project yggdrasil Pass Labs 7 19th January 2008 07:46 PM
Mini Ipod headphone amp DIY project Nordic Headphone Systems 14 11th March 2007 03:35 PM
simple PC mini-amp project ? jives11 Chip Amps 11 7th January 2005 02:05 PM
Mini-Monitor Project Going On gary f Multi-Way 29 20th March 2004 04:45 AM


New To Site? Need Help?

All times are GMT. The time now is 04:15 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2