BF-862 is something I've been testing as well. But my goal is to have it
phantom powered.
On 17 Feb 2015, at 20:13, Ivano Pelicella
[naturerecordists] wrote:
> Hi all
> I've had positive result with this circuit:
> www.dodotronic.com/public/piezo.png
> probably the 10 Mohm resistor could be changed with a smaller one to
> reduce
> noise and distortion
> It's simple and cheap and need a further amplifier to reach good
> results.
>
> Ivano
> www.dodotronic.com
>
> 2015-02-17 20:00 GMT+01:00 'Jonas Gruska'
> [naturerecordists] <>:
>
>>
>>
>> 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
>> homepage <http://jonasgru.sk>
>>
>>
>>
>
>
>
> --
> _________________
> www.dodotronic.com
=E2=9C=BA =E2=9C=BA =E2=9C=BA
http://jonasgru.sk
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