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Old 8th June 2006, 07:53 AM   #1
Wynand is offline Wynand  South Africa
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Default Typical guitar output?

Would anyboy be able to tell me what the typical output is from a guitar.

I want to make a guitar preamp with op-amps but I don't know what gain to use.
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Old 8th June 2006, 07:57 AM   #2
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For passive humbackers output is below 100mV in my guitar.
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Old 8th June 2006, 08:02 AM   #3
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My guitar is made in 1969 Make: Framus.

The pickups are still original.

Would 100mV be typical?

Wouldn't it be similar to a microphone preamp?
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Old 8th June 2006, 08:11 AM   #4
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I don't know.
Fender is believed to have much lower signal than, say, Ibanez RG.
Dynamic microphone preamp may be useful, same as consolete input it definitely works and amplifies. But for guitar pickups input impedance over 1 Mohm is useful.
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Old 8th June 2006, 08:24 AM   #5
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I spoke to somebody who said they'd think the output would be approx. 1mV.

Could there be such a difference?

The difference would mean 1000x gain vs. 10x
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Old 8th June 2006, 08:28 AM   #6
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The "below 100mV" I got was with bridge humbacker and strong strike in E6 string. Middle single-coil actually give order lower voltage. I think it depends on what you measure. If you play normally using sigle-coil, 1mV seems reasonable mean value to me.
It is very dynamic instrument.
I measured kind of maximum.

cheers
Adam
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Old 8th June 2006, 08:37 AM   #7
Wynand is offline Wynand  South Africa
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Thanks for the replies.

If I use 2 opamps in the preamp and LM3876 for the main amp at gains of 30x 30x and 20x that should be a total of 18000 gain.

@1mV x18000 = 18V if I'm correct.

With the amps rails at 24V that should fine shouldn't it?
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Old 8th June 2006, 09:16 AM   #8
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hmmm...
measured again
my voltmeter says:
humbucker: up to 200mV
siglecoil: up to 150mV
at normal paying below 100mV
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Old 8th June 2006, 09:25 AM   #9
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In my experience humbuckers give out between 80-150mV during normal playing. A pre with a gain between one and five should be more than adequate.
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Old 8th June 2006, 09:27 AM   #10
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I'm not sure what pickups i've got on my guitar?!?

Do you know the output of other types of pickups?

How do I see if it's a humbucker?
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