great, that fits well.
Gianni
2016-04-08 15:27 GMT+02:00 Ivano Pelicella
[naturerecordists] <>:
>
>
> this one is much simpler
> 2nd order
> 1 op amp
> 200 bandwidth
> https://www.dropbox.com/s/rh8mt7defh8qhnw/high%20pass%20200hz.png?dl=3D0
>
> Ivano
>
> www.dodotronic.com
>
>
>
> 2016-04-08 14:04 GMT+02:00 Gianni Pavan
> [naturerecordists] <>:
>
>>
>>
>> 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
>>>> and battery powering.
>>>>
>>>> For P48 I'd try with SimplestP48. Alternatives ? (my philosophy is t=
o
>>>> 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 r=
olloff
>>>>> 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 microphone=
s. I
>>>>> some cases it would be useful to have a high pass filter to limit low
>>>>> frequency noise, 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
>>
>>
>
>
> --
> _________________
> 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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