Yes the pickup and the stator are separate issues, separate threads, etc..

I have tried to make very specific questions, as I know very well the system and
what I need, so I didn't want to bore You with too much theoretical questions.
For example, the battery is out of question. No, no, no. It's a racing bike and
even 300 grams do make difference. Also, and not less importantly, they all do
without. It can be certainly done.

Again, all sparks are not created equal. I thank You for all Your replies but
as I said I have clear ideas on what is needed. A spark with not enough energy,
expecially on a 2 stroke engine (which can easily foul plugs), will not cause
complete combustion. Which would result in loss of power, irregular run, etc..

I could write tons of text about why I have the requirements I have, I just didn't
think it was of real interest to anyone. I wanted to nail some concrete questions.
I agree that generally it's much better to specify what one wants to achieve, but
I don't think this was the case. I don't need advice if using a battery is better
or not, or if a CDI is better than a TDI, etc.. as I have constraints and have
already extensively analyzed all these aspects (in other words, I have made my
homework, as much as I could at least).

Anyhow:

I have identified some IC's that are commonly used as "PFC boost pre-regulator",
and they are:

MC33626
MC33668
UC3853-5
L4981A/B
L6561

is there any other "notable" IC that I am missing?

Basicly what I need is a PFC ~1.0 boost converter that will take from the stator
(through a full bridge) DC half-sinusoids down to 10V peak (under load) up to ~50V,
with frequences ranging from 25Hz to 700Hz, and will output 100V..300V that will be
used to charge a ~ 3uF polypropylene 400V capacitor.
It will have to charge it within 8 half sinusoids (a complete engine cycle). It can
even go down to just 100V-150V at charging the (relatively) big capacitor at low rpm's,
although the normal (say mid-range RPM) voltage to be reached must be around 300V.

Changing topic (!) the pickup issue is now solved, I followed Your advice that *there*
I need maximum voltage (clean signal) and I've experimented with filters, resistive
and reactive loads, etc.. until I came out with a simple NPN transistor based design,
which has proven (on the oscilloscope) to be very effective anyway.

With kind regards,
Mario

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