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cool_tejinder Posted - Mar 09 2006 : 12:34:35 AM
I need a schematic for a shift light. Cant seem to find it on google. Basically it should operate in the following way:

Take input from CDI or the spark cable n when a certain rpm is reached light up an LED or something. Also i need it to be programmable. PLZ HELP

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Why ask questions to which you already know the answers!!!
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Aaron Cake Posted - Mar 09 2006 : 10:23:53 AM
It's not that hard to make. My first thought is to just buy one as they are not really that expensive. By the time you make one the commercial $40 shift lights are starting to look good since they come with a case, warranty, instructions, etc.

If you want to make one yourself, check this out:
http://autospeed.drive.com.au/cms/A_2810/article.html

If you want to start from scratch, you will need a frequency to voltage converter IC and then an op-amp configured as a comparator. Likely some input logic to filter the signal (maybe an opto isolator) as well.

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