Electronics > Projects, Designs, and Technical Stuff

how much gain do I need for a guitar preamp to drive a line input?

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ELS122:
basically I have a transistor output stage that I can easily drive from my phone, how many gain stages I need and how much gain to drive it from a guitar?

I'm also looking for  a LOT of gain.

Prehistoricman:
Okay, Moregain Freeman. Did you answer your own question?  :D

gbaddeley:
A guitar pickup might output 100mv or less, depending on load impedance and how hard you play. A hot pickup could output over 1v if the strings are hit hard.

TheUnnamedNewbie:
I believe in the case of guitars, the problem is not the level but the impedance. You might need a high impedance unity-gain buffer (current gain) more than any actual voltage gain.

Circlotron:
High impedance, yes. I read that too low an impedance will dampen the strings. May only by a negligible  amount though.

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