LED meter drivers

Jan 27, 2004 1 Replies
T

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.



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H

Thomas Stegen wrote on 27/01/2004 :-

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.

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