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Old 2nd February 2009, 03:46 AM   #1
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Default Amplify my 4 ohm speaker

Hello!
I'm new to all this amp stuff, and i hope this is the right section for this.
I've got a 4 ohm speaker, and i want to be able to plug my guitar in and get sound out of it. i dont really care about the sound quality, i just want a spare amp.

so where do i have to start then?
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Old 2nd February 2009, 09:39 AM   #2
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Location: Recife - Brasil Northeast
Default Try this one...it is good, it is cheap and it is easy to build and will match you


guitar needs...gain is adjustable to allow you to adjust is to your guitar output signal...can use simple power supplies or batteries (portable if you want)....nice, reliable, easy...match your needs as a beginner searching for something fast, easy, simple, good, reliable and so on.

Do not be impressed with watts...means absolutelly nothing..depends your speaker efficiency..some speakers can drive high levels of air pressure (sound) with 2 watts.... and you gonna have 6 watts RMS... and this is something alike 100 watts into the advertising (the way they use to say when sell portable units).... repeating, as we have our mind made by a terrible advertising brain wash of foolish beliefs..... this power is enougth to play loud..very loud!

Here is the link for the datasheet with all informs you may need...including schematic and informations about how to adjust gain and all needed stuff.

Need only to know what is a resistance, a capacitor and basic electronic assembling knowledges..the basic from the basic.

http://www.datasheetcatalog.org/data...cs/mXutuqt.pdf

regards,
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Old 2nd February 2009, 10:57 AM   #3
lineup is offline lineup  Sweden
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Build one LM1875 chip amp
If you goto Chip Amps forum, you can find stuff -> Search LM1875

Chip Amp is only one IC with 5 pins, and a few resistors and capacitors to add to the pins of the CHIP.

5 Pins:
----------
input positive
input negative pole
output
V+ postive supply node
V- negative supply node

There are good descriptions how to build your IC power amp.
In forum and in internet.
Most use LM3875 but the circuit is very much the same for LM1875.
Here is one site about Gainclone = chip amplifiers:
http://myweb.tiscali.co.uk/nuukspot/...ncloneFAQ.html


Regards Lineup
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Old 2nd February 2009, 04:14 PM   #4
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Thx for the replies!
but after seeing this, i'm affraid it's a little to complicated.

Isn't it also possible to put a preamp like this:

http://www.musicstore.de/en_EN/NLG/M...REC0004227-000

between my guitar and the speaker.
power adapter included, so i only have to connect the jack to the + and - of the speaker? or is this not going to work?
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Old 2nd February 2009, 04:46 PM   #5
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(sorry, cant find Edit button )

or one like this:

http://www.musicstore.de/en_EN/NLG/B...REC0003581-000
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Old 2nd February 2009, 07:33 PM   #6
jaycee is offline jaycee  United Kingdom
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Location: Norwich, UK
No. Driving headphones is far less demanding than driving a speaker. Your headphones are normally 32 ohms and only need a few milliwatts to produce enough sound to make you deaf. For a 4 ohm speaker you need watts of power, so you need to have a power amplifier.

To be honest if you aren't up to building any kind of circuit then you are best sticking to a pre-made product. You can get amp cabinets that are designed to be connected to external speakers via a 6 1/4" jack. Do bear in mind that the speaker will need to be able to handle quite a bit of power for guitar use.
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Old 4th February 2009, 08:26 PM   #7
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anybody got an example of such amps?
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Old 4th February 2009, 08:49 PM   #8
tinitus is offline tinitus  Europe
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http://guitar.eskildsen.dk/ShowProdu...roductId=13608

This little fellow(COMBO) is all you need, and cost only around 100EUR...or something like that

Anyway, as others said, theres a huge possible risk to blow your hifi speakers, doing what you suggest

This one is only 40 EUR

http://www.stringsite.com/guitar_og_...o_2390_da.html
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Old 4th February 2009, 11:11 PM   #9
Minion is offline Minion  Canada
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Do something like get a Effects pedal Kit that has gain and tone controll features and connect it to a TDA2003 or TDA2030/40/LM1875 power amp kit ......

There are alos a lot of really small guitar amps based on the LM386 chip like the Ruby or little gem ....

CHeers
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Old 5th February 2009, 07:28 PM   #10
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Quote:
Originally posted by tinitus
http://guitar.eskildsen.dk/ShowProdu...roductId=13608

This little fellow(COMBO) is all you need, and cost only around 100EUR...or something like that

Anyway, as others said, theres a huge possible risk to blow your hifi speakers, doing what you suggest

This one is only 40 EUR

http://www.stringsite.com/guitar_og_...o_2390_da.html

Whith this, i got a complete combo. isnt there just a thing like this:

Click the image to open in full size.
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