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Old 10th February 2013, 09:23 AM   #1
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I'm looking to build a desktop practice amp, no bigger than a sheet of A4 (not set in stone on size).

The idea being to create a little practice amp which runs off a battery (pp3) or maybe a wall wart. I have a couple of speakers to use and am thinking of making a very simple amp. The question I have is Class A or Class AB?

I was thinking about a simple single transistor Class A setup with volume and no tone stack(use guitar for that).

Then thought about building a Class AB just for fun. Not really huge power just want to get a decent little amp for practicing on.

Both have same (approx) amount of comps, so any thoughts?

Many thanks.
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Old 10th February 2013, 10:18 AM   #2
Mooly is offline Mooly  United Kingdom
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The words Class A and PP3 don't really go together The battery life would be measured in literaly seconds as it couldn't supply the current.

Best bet is a simple single rail chip based amp and suitable wall wart PSU.
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Old 10th February 2013, 10:39 AM   #3
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I was thinking along the lines of a headphone amp to drive the speaker, ao it's not possible to make a desktop amp with a transistor(or two) a handful of resistors and a small speaker.

OP Amp version me thinks then!
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Old 10th February 2013, 10:40 PM   #4
JMFahey is offline JMFahey  Argentina
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Make an LM386 based one.
Google "LM386 guitar amplifier" and enjoy.
You'll even find direct transfer PCB designs, or perfboard/veroboard versions.
Good luck.
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Old 14th February 2013, 05:37 PM   #5
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Just ordered some LM386, cheers.
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Old 18th February 2013, 08:52 PM   #6
shanx is offline shanx  Canada
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Location: Quebec
One of the versions for practice guitar amp using LM386 that has had a lot of successful DIY builds is the Ruby Amp by ROG. It uses a simple JFet as a buffer between the guitar and chip amp. That will increase the input impedance of your practice amp, giving better performance. It will also warm up the sound a bit compared to going in direct. Lots of sound demos available, and it is only a few more components so it is easy to give a try.
Have fun!
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