BESSIE designs LC Bessel filters up to 5th order. LCNORM normalizes or scales filters for new frequencies or impedances. That's always a nuisance to do by hand. https://www.dropbox.com/s/syvu0wsx7s9rllk/Filter_Progs_1.zip?dl=0 I hope I got them right. -- John Larkin Highland Technology, Inc lunatic fringe electronics
a couple of LC filter progs
Started by ●April 5, 2019
Reply by ●April 7, 20192019-04-07
On Friday, April 5, 2019 at 7:55:47 PM UTC-7, John Larkin wrote:> BESSIE designs LC Bessel filters up to 5th order. > > LCNORM normalizes or scales filters for new frequencies or impedances. > That's always a nuisance to do by hand. > > https://www.dropbox.com/s/syvu0wsx7s9rllk/Filter_Progs_1.zip?dl=0 > > I hope I got them right. >I'll also put in a plug for this site, which I've been using quite a bit lately to build elliptic BPFs at VHF: https://rf-tools.com/lc-filter/ Results match those from the AADE program but this web-based program has the ability to specify standard part values, which the AADE program doesn't. -- john, KE5FX
Reply by ●April 7, 20192019-04-07
Here's a fully online one. Not a designer, but a simulator: https://www.seventransistorlabs.com/Calc/Filter1~.html Still rather clunky, and some features have already broken in newer Chrome. Haven't had any reason to update it though... Tim -- Seven Transistor Labs, LLC Electrical Engineering Consultation and Design Website: https://www.seventransistorlabs.com/ "John Larkin" <jjlarkin@highlandtechnology.com> wrote in message news:j05gaeh4rgqtsm8leoorc84nna492o7j2j@4ax.com...> BESSIE designs LC Bessel filters up to 5th order. > > LCNORM normalizes or scales filters for new frequencies or impedances. > That's always a nuisance to do by hand. > > https://www.dropbox.com/s/syvu0wsx7s9rllk/Filter_Progs_1.zip?dl=0 > > I hope I got them right. > > > > -- > > John Larkin Highland Technology, Inc > > lunatic fringe electronics >
Reply by ●April 7, 20192019-04-07
On 6/4/19 1:55 pm, John Larkin wrote:> BESSIE designs LC Bessel filters up to 5th order. > > LCNORM normalizes or scales filters for new frequencies or impedances. > That's always a nuisance to do by hand. > > https://www.dropbox.com/s/syvu0wsx7s9rllk/Filter_Progs_1.zip?dl=0 > > I hope I got them right.Why not publish the source code, so they can be scrutinised, and maybe rewritten in a modern language or for another operating system? Open Source rules for this kind of thing. Clifford Heath
Reply by ●April 7, 20192019-04-07
On Sat, 6 Apr 2019 20:07:03 -0700 (PDT), "John Miles, KE5FX" <jmiles@gmail.com> wrote:>On Friday, April 5, 2019 at 7:55:47 PM UTC-7, John Larkin wrote: >> BESSIE designs LC Bessel filters up to 5th order. >> >> LCNORM normalizes or scales filters for new frequencies or impedances. >> That's always a nuisance to do by hand. >> >> https://www.dropbox.com/s/syvu0wsx7s9rllk/Filter_Progs_1.zip?dl=0 >> >> I hope I got them right. >> > >I'll also put in a plug for this site, which I've been using quite a bit >lately to build elliptic BPFs at VHF: > >https://rf-tools.com/lc-filter/ > >Results match those from the AADE program but this web-based program has the >ability to specify standard part values, which the AADE program doesn't. > >-- john, KE5FXThat's impressive. It looks competitive with the expensive NuHertz software. NuHertz also does some rare filter forms, and finite-Q designs. I usually use a filter design program to get ideal values, then plug into Spice and try values that we have in stock. Here's my units conversion program: https://www.dropbox.com/s/64rg7ko4rc7hhw7/U.zip?dl=0 -- John Larkin Highland Technology, Inc lunatic fringe electronics
Reply by ●April 7, 20192019-04-07
On Sun, 7 Apr 2019 00:41:25 -0500, "Tim Williams" <tiwill@seventransistorlabs.com> wrote:>Here's a fully online one. Not a designer, but a simulator: >https://www.seventransistorlabs.com/Calc/Filter1~.html > >Still rather clunky, and some features have already broken in newer Chrome. >Haven't had any reason to update it though... > >TimSpice does that too! I am simulating some pulse generator output circuits that are screaming fast but ring at GHz time scales. So I'm simulating the circuit and a cleanup filter together, using a filter form that looks broadband ohmic on its output port to absorb cable reflections, ideas cribbed from Jeroen. Of course, the physical circuits don't behave like the sims. This is a sim/test loop that ideally converges. -- John Larkin Highland Technology, Inc lunatic fringe electronics
Reply by ●April 7, 20192019-04-07
On Sun, 7 Apr 2019 17:56:20 +1000, Clifford Heath <no.spam@please.net> wrote:>On 6/4/19 1:55 pm, John Larkin wrote: >> BESSIE designs LC Bessel filters up to 5th order. >> >> LCNORM normalizes or scales filters for new frequencies or impedances. >> That's always a nuisance to do by hand. >> >> https://www.dropbox.com/s/syvu0wsx7s9rllk/Filter_Progs_1.zip?dl=0 >> >> I hope I got them right. > >Why not publish the source code, so they can be scrutinised, and maybe >rewritten in a modern language or for another operating system? > >Open Source rules for this kind of thing. > >Clifford HeathWell, I didn't write it to be pretty. -- John Larkin Highland Technology, Inc lunatic fringe electronics
Reply by ●April 7, 20192019-04-07
John Larkin wrote...> > Here's my units conversion program: >https://www.dropbox.com/s/64rg7ko4rc7hhw7/U.zip?dl=0John, you should provide the code. -- Thanks, - Win
Reply by ●April 7, 20192019-04-07
On 7 Apr 2019 08:46:35 -0700, Winfield Hill <hill@rowland.harvard.edu> wrote:>John Larkin wrote... >> >> Here's my units conversion program: >>https://www.dropbox.com/s/64rg7ko4rc7hhw7/U.zip?dl=0 > > John, you should provide the code.It's PowerBasic, which hardly anyone uses, and it's pretty hacked looking. It just sort of happened. OK, added to the zip file. -- John Larkin Highland Technology, Inc lunatic fringe electronics
Reply by ●April 7, 20192019-04-07
John Larkin wrote...> > On 7 Apr 2019, Winfield Hill wrote: >> John Larkin wrote... >>> >>> Here's my units conversion program: >>>https://www.dropbox.com/s/64rg7ko4rc7hhw7/U.zip?dl=0 >> >> John, you should provide the code. > > It's PowerBasic, which hardly anyone uses, and it's > pretty hacked looking. It just sort of happened. > OK, added to the zip file.Hey, John, that's not so bad, thanks! -- Thanks, - Win
