4th order lowpass with one transistor

AudioAngel · 18th April 2007, 03:34 PM

Hello,

I've read on a magazine that it is possible to build a 4th order lowpass only by using on transistor stage instead of cascading two 2nd order stages. Is that true? Can anyone guide me, how to do that?

Regards,

Raphael

myhrrhleine · 18th April 2007, 05:08 PM

Hi,
A 4th order filter does not require *any* transistors/amplifiers/buffers but
the response of amplitude vs. frequency may be less than desirable for your application.

To answer your question fully, one would have to know something about the desired response curve.

AudioAngel · 18th April 2007, 05:42 PM

Ok, for an example let's say we want to make a Bessel filter with the design frequency 1kHz.

18th April 2007, 03:34 PM	#1
AudioAngel diyAudio Member Join Date: Dec 2003 Location: Verden	4th order lowpass with one transistor Hello, I've read on a magazine that it is possible to build a 4th order lowpass only by using on transistor stage instead of cascading two 2nd order stages. Is that true? Can anyone guide me, how to do that? Regards, Raphael

18th April 2007, 05:08 PM	#2
myhrrhleine diyAudio Member Join Date: Jan 2006 Location: Avalon Island	Hi, A 4th order filter does not require any transistors/amplifiers/buffers but the response of amplitude vs. frequency may be less than desirable for your application. To answer your question fully, one would have to know something about the desired response curve. __________________ Just because you can't hear it doesn't mean no one can.

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18th April 2007, 05:42 PM	#3
AudioAngel diyAudio Member Join Date: Dec 2003 Location: Verden	Ok, for an example let's say we want to make a Bessel filter with the design frequency 1kHz.

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