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Old 04-27-2003, 02:59 PM
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Post Diy shiftlight

Hi, does anyone know how to build a homemade adjustable shiftlight? I can't imagine that it would be that difficult if you have some electronics knowledge,I believe it's only a basic RPM sensing circuit/switch. I would appreciate any help,thanks.

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Old 05-03-2003, 07:25 PM
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Id recommend something that plugs into a power source and reads voltage.. Ive see some shift lights that plug into the ciggerete lighter and you adjust it to your shift point I believe its called a Pivot shift light.. like 65 bucks here at our local ricer shop.. no hardwiring needed and very stealthy.. blinks a red LED light hats very focused and it attaches with double side tape. tiny
take care.

*Chris
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Old 09-02-2004, 01:08 AM
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This schematic is the base for most tach/shiftlights. I am currently working on a complete schematic and project and will post it as soon as it is complete and tested. I also am looking for more information on this subject so anyone with a complete schematic for an shift light plewase contact me.
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Old 09-06-2004, 06:10 PM
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Comparator

Doc here:

I've never done it, But it would seem logical to be a simple Comparator Linear I.C Circuit, off pin 8 of the Frequency to Voltage Controlled oscillator, using a Pot From the + and Minus offsets of the Comparator Chip to adjust the Shift points.

You Could use a Buffered Bright L.E.D. (S) for shift points.

Get an old tach, and a Comparator and mock up a circuit, try it out!

Look under Linear I.C. Spec sheets on any Semi conductor manufacturing website for specific Information.

Or you could go low tech, and try a series of 4 or 5 zenier diodes at the appropriate Voltage thresholds off pin 8 to light the L.E.D.s only they will light in steps and stay lit until the threshold drops below forward bias on each LED...

Doc
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Last edited by docvette; 09-06-2004 at 06:16 PM.
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