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LED meter drivers

T

Thomas Stegen

Jan 1, 1970
0
Hi there.

I am looking for and LED meter driver which operates
based on a 0 to 12 volt squarewave. I want the number of
LEDs to light up to be proportional to the frequency of
the square wave. Ideal would be 15 outputs, but need not
be excact. I have been looking in some catalogues, but I
have a bit of trouble deciphering all those codes and stuff.
If anyone can help me with some of this it would be appreciated.
(Should be available from Britain btw).

I will be able to use a frequency converter.

If it matters:
It is to be used in a car, in british weather conditions,
Not to hot or cold.
 
H

Harry Bloomfield

Jan 1, 1970
0
Thomas Stegen wrote on 27/01/2004 :-
I am looking for and LED meter driver which operates
based on a 0 to 12 volt squarewave. I want the number of
LEDs to light up to be proportional to the frequency of
the square wave. Ideal would be 15 outputs, but need not
be excact. I have been looking in some catalogues, but I
have a bit of trouble deciphering all those codes and stuff.
If anyone can help me with some of this it would be appreciated.
(Should be available from Britain btw).

That is not a very well written specification, however....

Take a look at a frequency to voltage IC such as the 9400. On the
voltage output of that you will need an LED bargraph IC. These allow
for 8 LED's per IC and the display can be set either for single point
lit or a solid bar. These IC's can be cascaded to produce 8, 16 or 24
LED diplays in a single bargraph.

It sounds as if you are trying to build a tachometer, if so beware that
the voltage pulse at the ignition coil will require some conditioning
before being fed into the 9400.

--
Regards,
Harry (M1BYT)...

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