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 yo=
u =

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 "black =

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 s=
till =

can use a square or a sin waveform. What are you going to use the output si=
gnal =

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=3D=
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-- =

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