[sdiy] preamps for piezos (slightly OT?)

[Olivier Gillet]

The choice of op-amp matters. Bipolar op-amps have a low input
impedance (a few hundred k) which could have an impact on bass
response. An op-amp with JFET inputs would be a better choice here.

On Sun, Feb 14, 2016 at 7:20 PM, Busby Bergson <busby.bergson at gmail.com> wrote:
> hi synthdiys,
>
> i'm currently experimenting with contact mics. they sound pretty good going
> into a guitar amplifier, directly - but if i want to send them through my
> other circuitry, it seems that they require a specialized preamplifier, to
> compensate for their impedance.
>
> i've been using something along these lines:
> http://music-electronics-forum.com/attachments/4228d1232615609-non-invert.buffer.gif
>
> however, i'm noticing that there is still a significant high-passing -
> compared to the bassier direct-to-guitar-amplifier arrangement.
>
> any thoughts?
>
> -  b.b.
>
>
>
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