[minima] Re: LPF with molded inductors
- From: Ryan Kingsbury <ryan.kingsbury@xxxxxxxxx>
- To: minima@xxxxxxxxxxxxx
- Date: Tue, 4 Feb 2014 15:15:50 -0500
Hi Paolo,
I was wondering this myself as I was looking at non-toroidal inductor
sources earlier today. One of my long-term goals is to miniaturize the
minima design so that it is something small/light I can take on some of my
adventures abroad. Being able to leverage molded, or even SMT, inductors
would be a huge win both for space efficiency and cost.
The AADE filter design tool can take non-ideal Q as well as component
tolerances. A monte carlo sim can be run to see how sensitive the design
is to these non-ideal characteristics. I'll try to cook up some plots in
the next day or so to share with the group.
73,
Ryan
On Tue, Feb 4, 2014 at 1:25 PM, Paolo Cravero <paolo.cravero@xxxxxxxxx>wrote:
> Hello MINIMAlists.
> I have been lurking and learning so far, while gathering components to
> assemble my own MINIMA.
>
> Looking at the two LPFs with toroids and the declared exciter power output
> in the order of milliWatts, why not using molded inductors for them? Q will
> be lower (around 10 to 25 per inductor), but in case another lowpass
> section can be added at a fraction of the cost of another toroidal core.
>
> What else am I overlooking? Is a Q=10 too low for an effective LPF in
> MINIMA?
>
> 73,
> Paolo IK1ZYW
>
> PS: common values are 680, 820 and 1000 nH
>
> --
> GQRP #12058 + http://www.paolocravero.tk + I QRP #476
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