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 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 s=
o
>>>> you can use your own supply. The smaller the cap, the higher the rollo=
ff
>>>> 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 resourc=
e
>>>> for building both specialized and general purpose microphones. I some =
cases
>>>> it would be useful to have a high pass filter to limit low frequency n=
oise,
>>>> 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
|
