Francois Robbertze wrote:
>
> I am trying to control a TDA5051 Phillips home automation modem with a PIC...
>
> On page 20 of the datasheet for the TDA5051 they got a discription next to a 47uH inductor that state Low Rs (which I beleive must be something like low series resistance?). My supplier of electronic components just have the normal inductors.


Hi Francois, unless I am mistaken Rs stands for resisitance (series) or
series resistance etc. Any inductor that is the correct value inductance
but
measures low ohms with a standard dc ohm-meter should do. Some of the
very small
inductors (look like resistors) use very fine wire, and hence have
significant
series resistance due to the fine wire. If you pick any inductor of a
larger
physical size that has the correct 47uH value you should be ok. If the
inductor
is in the signal path it is not too critical (prob. spike filtering), if
it
is on the main power rail you might have to get a larger one with larger
diameter
wire (higher series current).

From memory you can build a 47uH inductor (such a low value inductance)
by wrapping about 47 turns of 0.5mm diameter enamelled wire around a
1 meg-ohm resistor. We used to make a lot of non-critical inductors this
way
back in the "old days". Of course, if the inductor is part of a tuned
circuit
or something it's value might be more critical.
-Roman

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