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cool_tejinder
Apprentice

India
112 Posts
Posted - Mar 09 2006 :  12:34:35 AM  Show Profile  Send cool_tejinder an AOL message  Send cool_tejinder a Yahoo! Message  Reply with Quote
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!!!

Aaron Cake
Administrator

Canada
6718 Posts
Posted - Mar 09 2006 :  10:23:53 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
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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