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Input Impedance Of Amp


-lachy-
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It depends to a huge extend on the amp but the rule with modern guitar amps is that they are all happy with hi-Z inputs. For preamp design, I would think you would be more interested in voltage and sensitivity. DR and that kinda stuff.

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What kind of microphone are you trying to match? As crafty pointed out, anything marginally below a Meg or so should work fine, provided the levels are about right. Are you trying to adapt a balanced mic, or is it single-ended? If you can be a little more specific about your needs, I've probably got a design or two lying about that you can use as a starting point and tweak to your own specs. :D

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Sounds like he just needs a DI box schematic. If you insist on building it, it shouldn't be too bad a project but the factory made ones are down to $29.00 thanks to some new one-chip preamp/gain thingy that is happy running on a 9 volt battery.

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Point taken - but an impedance matcher is the matter of about 20 minutes of work and about $15.00 worth of Radio Shack parts (if you include the $8.00 Hammond box), and it can be optimized for the application in size, operating voltage, frequency response and headroom. To each his own, I suppose. :D

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