On Tue, Jul 12, 2011 at 3:13 AM, Michael Watterson wrote= : > Depends what you want to achieve. Obviously, if you just want > :: Gain to Line level > :: Balanced and unbalanced transformerless input > :: Simplicity > :: Low distortion > :: Low noise > Use a suitable op-amp. > > If you want distortion, noise, complexity etc, use badly designed Valve > or transistor circuits. > Touch=E9. > > I'd not use a 741 though. For a guitar a single low noise transistor off > 15v regulated from 2 x PP3 is better. > I'll find a good opamp somewhere. They're pretty cheap. > I'd not use a Jfet either, unless I'm trying to simulate an EF86. > Electric Guitar pickups are low impedance and low signal. A high > impedance such as 3M Ohm is crazy. > Guitar pickups are low impedance? What resistor would you suggest there? Wh= y even put one? > For a Piezo-pickup you need to load with "correct" impedance or > frequency response is way off. Are there quality Piezo pickups? A J201 > is nothing special, a 2N3819 is similar. There are superior op-amps. > How would I know what kind of pickup I have? I know I have a humbucker pickup and two single coil pickups. > The suggested circuit is for Piezo pickups only and even for that I > think 3M sounds too large, but I'm not sure as I'm more familiar with > crystal (bad due damp degrades) and ceramic record player pickups. > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .