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=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/oc=
t,
>>> 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
>>>>> 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 =
rolloff
>>>>>> starts. Sensitive to the source and destination impedances, so it=92=
s 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 microphon=
es. I
>>>>>> some cases it would be useful to have a high pass filter to limit lo=
w
>>>>>> 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
>
>
>
--
www.dodotronic.com
|