Vasile,

I also use Elsie for RF Filters. On the Mac, I run it in a Windows 8.1 VM (=
Parallels).
It is my favorite and very flexible.

Jean-Paul
AC9GH



> On Jun 11, 2015, at 7:27 AM, embedded systems <piclist9@gmail.com> wrote:
>=20
> I found Elsie to be one of the best: http://www.tonnesoftware.com/elsie.h=
tml
>=20
> Vasile
>=20
> On Mon, Jun 8, 2015 at 3:32 PM, RussellMc <apptechnz@gmail.com> wrote:
>=20
>> There are various active filter calculation programs or online calculato=
rs
>> on the net.
>> Immediately to mind are those from AD, LT, NatSemi, TI?, ...
>> Each has strengths and weaknesses.
>>=20
>> This page from 'Okawa Electronic Design' (that just has to be [TM] :-) )
>> seems to be extremely good.
>>=20
>>                  http://sim.okawa-denshi.jp/en/Fkeisan.htm
>>=20
>> I think this reference came via a PICList post earlier today but if so I
>> can't find it. If so, many thanks.
>>=20
>> So-far noticed  strengths are relative simplicity of use, reasonable
>> flexibility, & some good features.
>> Nice is the ability to specify Exx ranges for capacitors and resistor
>> values eg caps as E6, R's as E12.
>> Ability to spec (some) caps or leave choice to program is good. (* see
>> below)
>> A good range of plots
>>=20
>> I haven't yet checked if it actually produces correct results but it
>> presumably does.
>>=20
>> Also on the site are a range of other calculators but I'd see others as
>> less useful (to me anyway).
>>=20
>> BUT
>>=20
>> Electronic Training Course
>>=20
>> On the same site is a wide ranging electronics tutorial with about 100
>> subject headings **BUT** ALL in Japanese.
>> GoggleTranslate makes it readable and somewhat comprehensible
>> (right click, "Translate to English" in Chrome.)
>>=20
>>            http://okawa-denshi.jp/techdoc/
>>=20
>> _________________________________________
>>=20
>> * minimising component value.
>> I find a basic 3rd order low pass S&K unity gain filter a useful quick t=
est
>> to see what a program produces.
>> (Good enough usually for a PWM filter)(Bessel can be surprisingly good
>> overall).
>> This program allowed 2 R values (3 Rs), 2 C values (3 Cs) + the unity ga=
in
>> buffer
>> (Buffer: either 1x transistor if Vbe drop OK, or 2 transistors for almos=
t
>> no DC offset, or 1 unity gain OA for good DC compliance. )
>> ((When I looked at the same design elsewhere recently they managed to ha=
ve
>> all Cs and al Rs different and non standard.))
>>=20
>>=20
>>=20
>>=20
>>                Russell
>> --
>> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
>> View/change your membership options at
>> http://mailman.mit.edu/mailman/listinfo/piclist
>>=20
> --=20
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist


--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.