This is actually part of a speed controlled motor controller. Know what I
mean? I have to control the motor's voltage in order to keep its speed
constant. This means I'll have to compare the speed with some reference and
then raise or lower the motor's voltage to keep its speed as I want
(probably this reference will be adjustable). I should do all this only with
opamps, resistors, capacitors, etc.
By black boxes, I meant I can't use Frequency-to-Voltage ICs, I should do
one myself. And can't use any "digital devices", such as a microcontroller,
or a A/D converter...

Cheers,
 Bruno

2009/5/28 Ruben J=F6nsson <ruben@pp.sbbs.se>

> Hi Bruno,
>
> > Hey guys,
> >
> > i've been trying the whole month to build an analogic frequency to
> > voltage converter, but got no good results. I can't use any black boxes
> > such as LM2907, LM331, LM555, etc. I should use only opamps, resistors,
> > capacitors, etc...
>
> I'm sure that there are a lot of people here that can help you but we have
> to
> do a lot of guessing. You say you can't use a "black box" like a 555 but
> you
> can still use an opamp which can also be considered a "black box". Perhaps
> you
> can explain why you can't use certain parts and better define what a "bla=
ck
> box" is.
>
> >
> > my input signal comes from a home-made encoder (one IR emitter spinning
> > and one IR receiver fixed on the side of the motor), so that it
> > generates an "impulses" in a random frequency. This frequency is what I
> > want to convert to a voltage or even another kind of signal, such as a
> > square or a sin waveform...
> >
> > anyone got an idea?
>
> Perhaps you can also explain why you can't use the frequency directly but
> still
> can use a square or a sin waveform. What are you going to use the output
> signal
> for and what will it be connected to?
>
> >
> > (sorry for the bad English...)
> >
> > cheers,
> >  Bruno
> >
> > --
> >   Bruno L. Albrecht
> >   Eng. da Computa=E7=E3o/06
> >   Falker Automa=E7=E3o Agr=EDcola Ltda.
> >   http://www.falker.com.br
>
> /Ruben
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D
> Ruben J=F6nsson
> AB Liros Electronic
> Box 9124, 200 39 Malm=F6, Sweden
> TEL INT +46 40142078
> FAX INT +46 40947388
> ruben@pp.sbbs.se
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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>
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