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there's the main msg. it's got pics and everything
Parts list [everything avaliable at rat shack]
> 2N3819 FET transistor [the round thing in the middle]
> a FET has source gate and drain. Look it up, it's important you get
> those connections right.
> 56k 1/4 watt resistor
> 10meg 1/4 watt resistor
> 22k 1/4 watt resistor
> 10uf capacitor, polar [electrolytic]
> .1uf capacitor, nonpolar [ceramic]
> 9volt battery and clip
> 1/4" mono jack
> wire the red wire from your piezo to the gate [middle] of the FET
> wire the black wire to a common ground point
> wire the 10meg resistor from the gate to ground
> wire the 22k resistor and the 10uf capacitor together in paralell as
> shown. Wire this assembly so the + side of the capacitor is wired to
> the source [look at the diagram on the transistor package to determine
> which is source] and the other side is wired to the common ground.
> Wire the red side of the 9v clip to the 56k resistor and the other
> side of the resistor to the drain
> wire the black wire of the 9v clip to the ground point.
> wire one side of the .1uf capacitor to the drain, and the other side
> to the tip of your output jack. Wire the ring to the common ground.
> This circuit provides unity gain, with no controls, but as I said, its
> as simple as it gets and it will really improve the sound of your
> piezo pickups.
> You MUST use the parts and values specified, as the circuit was
> optimized to use those components with that FET.
> good luck, let me know if you have any questions
Well, I guess I'll have to tweak the resistors a little for the MPF102 then..
Or one could use McMaster Carr to order the proper transistor..
Or course, then it wouldn't be RatShack friendly anymore, would it?