Hey everyone,
just a short note - I tried the Alex Rice's preamp and I didn't find the
results to be really good. It was very noisy. I used J201 fets.
Surprisingly, I had much better results with this simple circuit:
http://www.till.com/articles/PreampCable/images/plugschematic.gif
Now I am experimenting with various configurations and testing various
j-fets in place.
Impedance converter is a good option too, I bought this one:
hosatech.com/product/mit-129/
But its performance highly depends on the quality of your preamp - you
need to crank the gain a lot to get decent levels. And if your preamp is
noisy...
My Sound Devices 702 handles it well.
Regards,
Jonas
On 17 Feb 2015, at 19:51, Keith Smith
[naturerecordists] wrote:
> Hi, Ben.
> Radio Shack sells piezo buzzers for a couple of bucks that are nice
> and
> big. The Schallers can be had at most music stores for around $15, I
> think,
> and there are lots of sources on the web, of course.
>
> For *much* better performance you might consider something like this
> <http://www.zachpoff.com/diy-resources/alex-rice-piezo-preamplifier/>
> preamp
> if you don't mind doing some soldering. Piezo's are high impedance
> which
> isn't a great match for an input expecting to see a low impedance
> microphone.
>
> I just use what's known in the music business as a DI (for converting
> high
> impedance guitar outputs to match with mic preamps). They're just a
> transformer in a steel box with 2 1/4" TR (I/O)and one XLR output. The
> downside of DI's is that they're usually built for rough stage/road
> use,
> are bulletproof and probably heavier than you want. I use a dual one
> that
> weighs over a Kg. Not nice, but I don't hike far and it works very
> well.
> That does make that preamp I linked to look rather attractive if you
> want
> something light.
>
> I'm not sure what the transformer turns ratio is. Hopefully David will
> pop
> back in here with that. Top transformer brands for this are Sowter in
> the
> UK and Jensen in the US & Canada, but you can do OK with less
> expensive
> stuff if you stay away from the obvious garbage. If you got the
> transformers on their own, you could make up a stereo pair that would
> be
> fairly light weight with small connectors to suit your recorder.
>
> Either way, use something in there to get a better impedance match.
> The
> audio difference is well worth whatever it costs.
> k
=E2=9C=BA =E2=9C=BA =E2=9C=BA
http://jonasgru.sk
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