Hi, no need for gain as I connect to a good mic input (PIP)
we could discuss this further privately,
Gianni
2016-04-08 16:55 GMT+02:00 Ivano Pelicella
[naturerecordists] <>:
>
>
> if you like a could do a circuit and since it's so easy it can be mounted
> without a PCB (even if there could be some worst performance)
> do you need an amplification too?
>
> Ivano
> www.dodotronic.com
>
> 2016-04-08 16:51 GMT+02:00 Gianni Pavan
> [naturerecordists] <>:
>
>>
>>
>> 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=3D=
0
>>>
>>> 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/o=
ct,
>>>> 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 powerin=
g
>>>>>> and 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 PI=
P
>>>>>>> so you can use your own supply. The smaller the cap, the higher the=
rolloff
>>>>>>> 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 micropho=
nes. I
>>>>>>> some cases it would be useful to have a high pass filter to limit l=
ow
>>>>>>> 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 th=
e
>>>>>>> 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
>>
>>
>
>
> --
> _________________
> 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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