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Old 9th June 2003, 01:37 PM   #1
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Default Guitar Gainclone

I've got some lm3886 chips lying around doing nothing so i'm trying to use them up on a project.
I'm using the ESP Guitar Pre amp as input.
Would a typical inverted gainclone have good results?
Can anyone point out on for the lm3886, it doesn't seem as popular as the lm3875 but I read somewhere the same circuit applies but with a mute resister... is this ture?
Thanks
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Old 9th June 2003, 02:13 PM   #2
elizard is offline elizard  Canada
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if you want to use the 3886, check elliot's P19
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Old 9th June 2003, 04:55 PM   #3
Thomas is offline Thomas  Denmark
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Default Re: Guitar Gainclone

Quote:
Originally posted by fr0st
I've got some lm3886 chips lying around doing nothing so i'm trying to use them up on a project.
I'm using the ESP Guitar Pre amp as input.
Would a typical inverted gainclone have good results?
Can anyone point out on for the lm3886, it doesn't seem as popular as the lm3875 but I read somewhere the same circuit applies but with a mute resister... is this ture?
Thanks

You need a resistor from pin 8 to V- to bypass the mute function. 47K worked fine for me.
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Old 13th June 2003, 07:31 AM   #4
sangram is offline sangram  India
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For noisy stuff like guitar would actually suggest non-inverting with guard rings to add HF stability. The long signal cables and high tendency to oscillate or feedback makes a point for non-inverted? IMHO it does.

Inverting does sound better but in a band/gig/jam you may not be able to get that much difference out of your sound. Anyway you're not on tube amp so I don't imagine tone is a priority here...
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Old 13th June 2003, 08:06 AM   #5
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I would also suggest a non-inverting topology. My argument is that this allows for current-sensing feedback, which make it a high output impedance amplifier much more like a low feedback tube amp.

I think Rod Elliot has some info on that too.

Goodluck,

Thijs
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