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Old 1st October 2006, 10:04 PM   #1
Carcano is offline Carcano  United States
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Default Looking for a tutorial?

Hi experts! Extreme noob Carcano here with my first post!

Im a guitar player, and want to build a low-watt power chip amp based on the LM380. I have the chip already, along with a Jensen 8ohm 8" speaker and a 12 volt power supply - thats it so far.

Of course I haven't got a clue what I'm doing, except I'm good with a soldering iron, and am willing to spend whatever time and money is necessary to build what I have in mind...if its possible???

I dont even know if the LM380 will distort. What would be ideal is to get a good clean sound up to 'loud talking' volumes, and then have it gradually distort into the 'shouting' range...4 watts max. Even better if it ONLY distorted in the higher freqs, as this would give it a more spongy feel like power tube distortion.

What I need right now is to study a 'how to' web resource on simple circuit building. Can anyone here direct me to such a site...links???
Thanks so much!
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Old 2nd October 2006, 03:23 PM   #2
Carcano is offline Carcano  United States
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Join Date: Oct 2006
Heres a simple LM380 circuit I found rummageing around in the archives.
Would this work as a low-watt guitar amp? The input from an electric guitar is anywhere from zero to one volt, and I dont know if this is enough to power an amp like this into distortion. I dont want to include a volume or tone control in the circuit as I already have this on the guitar.

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Old 3rd October 2006, 03:19 AM   #3
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Where do you get the 1 Volt from. Guitar pickups are usually much lower. You mite need a gain stage before.
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Old 3rd October 2006, 05:02 AM   #4
ppfred is offline ppfred  Canada
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Location: Montreal
Default Re: Looking for a tutorial?

Quote:
Originally posted by Carcano

What I need right now is to study a 'how to' web resource on simple circuit building. Can anyone here direct me to such a site...links???
Thanks so much!
Lots of good tips & howto info for beginners on this one
http://www.bcae1.com/

A gainclone build on perforated board:
http://www.werple.net.au/~gnb/audio/...designlog.html

You'll find lots of info on cct building on these sites:
http://gainclone.com/phpBB2/index.php
http://c.webring.com/hub?ring=gaincloneamplifi
http://www.geocities.com/rjm003.geo/...io/diy_gc.html
http://myweb.tiscali.co.uk/nuukspot/decdun/
http://www.adx.co.nz/techinfo/audio/gainclone1.htm
http://jwg.student.utwente.nl/fedde/chill-amp2.html

fred p
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Old 3rd October 2006, 05:45 AM   #5
Carcano is offline Carcano  United States
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You could be right. Im just guessing because I sometimes use three overwound pickups in combination.

Why would I need a gain stage?
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Old 3rd October 2006, 05:45 AM   #6
Carcano is offline Carcano  United States
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Join Date: Oct 2006
How do I determine whether a chip needs a gain stage from the spec sheets?
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Old 3rd October 2006, 05:50 AM   #7
Carcano is offline Carcano  United States
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Join Date: Oct 2006
Excellent Fred!
I'll dig into that...thanks!
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