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Old 27th July 2006, 07:45 AM   #1
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Default Preamp with line level output

I'm somewhat new to preamps (actually DIY electronics in general) but I've searched the net high and low for a schematic to build a simple preamp with an input for a guitar and a line level output. Either I don't recognize it when I see it or is this not normally done?

I'm expiramenting with (actually trying to design from scratch) a piano pickup and I need a box witth 6 preamp inputs which will then go to line level so I can work with it from there. I have the schematics everything else, I just need the preamp stage.
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Old 27th July 2006, 05:18 PM   #2
sreten is offline sreten  United Kingdom
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Hi,

Perhaps you've got no answer because all pre-amps have line level outputs.

What level is line level depends on the circumstances, home hi-fi,
semi-proffessional equipment and full professional equipment.

/sreten.
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Old 27th July 2006, 07:25 PM   #3
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Thanks for clarifying that for me sreten,

basically it would go to like an AUX input on a home stereo.
I tried this one once...

http://www.till.com/articles/GuitarPreamp/

...and I could barely hear anything, like it needed more gain.
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Old 28th July 2006, 06:14 PM   #4
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I just simulated that "guitar preamp" circuit. It almost amounts to a buffer, with less than 1 dB of voltage gain. That circuits description is misleading, I'd say. No wonder it sounded quiet. I was able to get 7 dB of gain by reducing the 2.2kohm resistor to 30 ohms and changing the 6.8 kohm resistor to 10kohms. Using an op-amp might be the quickest way to get you to large gain. Try an LF-353. It's got a JFET input. ...good for high impedance sources (i.e. guitar)
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Old 28th July 2006, 10:52 PM   #5
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Thanks mrshow4u, I'll give that a try.
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Old 30th July 2006, 12:42 PM   #6
sreten is offline sreten  United Kingdom
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http://www.till.com/articles/PreampCable/index.html

Hi,

The above is the basis of the circuit and its not a pre-amp, it is
in effect a buffer, allowing a guitar to use long cables without
losing top-end. It has high power gain (allowing low impedance
loading) but low voltage gain - which is nowhere near enough.
It is designed to work into a guitar level input, so not a pre-amp.

Any more normal guitar pre-amp circuit will work into your AUX.

/sreten.
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