thanks Ivano for the scheme. However it is too sharp (4th order =3D 24
dB/octave) for my needs. I'd need something smoother, e.g. max 12 dB/oct,
however 6 dB/oct could be enough, and at lower frequency, e.g. below
100-200 Hz.
Gianni
2016-04-08 12:45 GMT+02:00 Ivano Pelicella
[naturerecordists] <>:
>
>
> Hi Gianni
>
> I've done a 2 operational amplifier circuit design:
> a high pass filter second order with a passband attenuation -3 dB and
> passband frequency 500 hz, 4th order, single power supply
> is it ok for you?
> Here the link to download:
> https://dl.dropboxusercontent.com/u/12325729/high%20pass%20sch.zip
>
> Ivano
>
> 2016-04-08 12:06 GMT+02:00 Gianni Pavan
> [naturerecordists] <>:
>
>>
>>
>> Hi Dan, thanks, great and simple. I'll do test with both P48 powering an=
d
>> battery powering.
>>
>> For P48 I'd try with SimplestP48. Alternatives ? (my philosophy is to
>> keep as simple as possible)
>>
>> For usual battery powering which is the simplest circuit design ?
>>
>> Gianni
>>
>> 2016-04-08 6:24 GMT+02:00 Dan Dugan [naturerecordists] =
<
>> >:
>>
>>>
>>>
>>> A capacitor will do both, roll off the low frequencies and block PIP so
>>> you can use your own supply. The smaller the cap, the higher the rollof=
f
>>> starts. Sensitive to the source and destination impedances, so it=92s a
>>> custom thing. Start with 1uF and see what happens.
>>>
>>> -Dan
>>>
>>> Hi all, EM172 and other capsules with PIP powering are a great resource
>>> for building both specialized and general purpose microphones. I some c=
ases
>>> it would be useful to have a high pass filter to limit low frequency no=
ise,
>>> e.g. generated by breeze or wind.
>>>
>>> I would ask to those more expert than me in electronics if it is
>>> possible to insert a simple HP filter in between the capsule and the
>>> recorder input, eventually also considering to replace the PIP from
>>> recorder with a dedicated battery.
>>>
>>> Gianni Pavan
>>>
>>>
>>>
>>
>>
>> --
>> Centro Interdisciplinare di Bioacustica e Ricerche Ambientali
>> Universit=E0 degli Studi di Pavia
>> Via Taramelli 24, 27100 Pavia
>> http://www.unipv.it/cibra
>> http://mammiferimarini.unipv.it
>>
>>
>
>
> --
> _________________
> www.dodotronic.com
>
>
>
--
Centro Interdisciplinare di Bioacustica e Ricerche Ambientali
Universit=E0 degli Studi di Pavia
Via Taramelli 24, 27100 Pavia
http://www.unipv.it/cibra
http://mammiferimarini.unipv.it
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