Chebyshev / Butterworth analog filter question - Electronic Circuits Projects Diagrams Free

psu_EE_guitar_nut · 30th November 2004, 03:32 AM

Regarding the above mentioned analog filters could someone tell/show me a general way of transmuting the equations for a Chebyshev / Butterworth filter into hardware. The math and theory I understand very well, but the books i have are pretty vague about implementing. Any help would be appreciated.

stevez · 30th November 2004, 12:55 PM

Take a look in the ARRL Handbooks - they cover the subject reasonably well. They provide normalized tables of values that you 'adjust' for your specific application. I do not know if what they present is appropriate for acoustic applications but some reading ought to reveal that quickly.

FYI - ARRL is American Radio Relay League. I think it would be reasonable to assume that Radio Society of Great Britain has similar information. IM me if you can't get to one of the books.

Russlk · 1st December 2004, 02:10 AM

I did this 36 years ago (EE magazine, October, 1968, pages 57-64). The basic idea is simple: you write the circuit equation in terms of R & C in the same form as the Butterworth or Chebycheff. You can then equate similar terms in the two equations and solve for R & C.
This has been done many times and tables are now published so you don't have to do it again.

psu_EE_guitar_nut · 2nd December 2004, 05:00 AM

hey thanks, i looked on your website Russelk , and i like the one filter program on there but i can't get basic to work on win XP any ideas how to fix it?

Russlk · 2nd December 2004, 08:39 PM

I use Windows XP and run the programs in a DOS window. Under "accessories" click on "command prompt". The command to change directories is: CD path, or CD.. will step up one level. To see what is in the directory, the command is: DIR. To start an application, the command is: RUN name. To exit the DOS window, type EXIT. To get out of a GWbasic program, type: SYSTEM. If you need more help, PM me.

psu_EE_guitar_nut · 3rd December 2004, 04:58 AM

An error message pops up that says '...AUTOEXEC.NT The system file is not suitab;e for running MS-DOS and Microsoft Windows applications....'
Kinda of strange, doen't autoexec allow windows to run? Any ideas?

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30th November 2004, 03:32 AM	(permalink)
psu_EE_guitar_nut	Chebyshev / Butterworth analog filter question Regarding the above mentioned analog filters could someone tell/show me a general way of transmuting the equations for a Chebyshev / Butterworth filter into hardware. The math and theory I understand very well, but the books i have are pretty vague about implementing. Any help would be appreciated. __________________ never lost, merely waiting for the place I\'m supposed to be to find me

30th November 2004, 12:55 PM	(permalink)
stevez	Take a look in the ARRL Handbooks - they cover the subject reasonably well. They provide normalized tables of values that you 'adjust' for your specific application. I do not know if what they present is appropriate for acoustic applications but some reading ought to reveal that quickly. FYI - ARRL is American Radio Relay League. I think it would be reasonable to assume that Radio Society of Great Britain has similar information. IM me if you can't get to one of the books. __________________ stevez

1st December 2004, 02:10 AM	(permalink)
Russlk	I did this 36 years ago (EE magazine, October, 1968, pages 57-64). The basic idea is simple: you write the circuit equation in terms of R & C in the same form as the Butterworth or Chebycheff. You can then equate similar terms in the two equations and solve for R & C. This has been done many times and tables are now published so you don't have to do it again. __________________ see my website: www.geocities.com/russlk

2nd December 2004, 05:00 AM	(permalink)
psu_EE_guitar_nut	hey thanks, i looked on your website Russelk , and i like the one filter program on there but i can't get basic to work on win XP any ideas how to fix it? __________________ never lost, merely waiting for the place I\'m supposed to be to find me

2nd December 2004, 08:39 PM	(permalink)
Russlk	I use Windows XP and run the programs in a DOS window. Under "accessories" click on "command prompt". The command to change directories is: CD path, or CD.. will step up one level. To see what is in the directory, the command is: DIR. To start an application, the command is: RUN name. To exit the DOS window, type EXIT. To get out of a GWbasic program, type: SYSTEM. If you need more help, PM me. __________________ see my website: www.geocities.com/russlk

3rd December 2004, 04:58 AM	(permalink)
psu_EE_guitar_nut	An error message pops up that says '...AUTOEXEC.NT The system file is not suitab;e for running MS-DOS and Microsoft Windows applications....' Kinda of strange, doen't autoexec allow windows to run? Any ideas? __________________ never lost, merely waiting for the place I\'m supposed to be to find me