VSS and freq converter circuit

xxalexx at ix.netcom.com xxalexx at ix.netcom.com
Wed Mar 4 08:15:31 GMT 1998


> Date:          Tue, 03 Mar 1998 13:43:07 -0500
> From:          Andris Skulte <askulte at emerald.tufts.edu>
> Subject:       VSS and freq converter circuit (real long)
> To:            diy_efi at efi332.eng.ohio-state.edu
> Reply-to:      diy_efi at efi332.eng.ohio-state.edu


> Chris-
>  I was just about to post something similar, but I need to convert the
> signal. I'm converting from my T5 to a T56 transmission, which has an
> electric sender. The biggest problem is that the pre-90 camaros have a
> mechanical sender. The firebirds had electric after 86, I think. I'm
> picking up a firebird electric speedo and VSS box, which will wire right
> up. My challenge is to make the cyberdyne calibration box. This box
> converts the 40 pulse +12V signal per shaft revolution to a 2000 pulse
> per mile signal (what my VSS Buffer expects). Here are some emails I've
> gotten before, but I'm a MechE, who knows just enough electrical stuff
> to get in trouble. The technical stuff will have to be explained, so I
> can go to Active Electronics, buy the parts, solder them together, and
> off I go :)
> 

> If you read all this, you must be bored ;) Seriously, thanks for any
> help. I know Cyberdyne makes a black box that lets you adjust for ratios
> in addition to converting for $70, but if I can make it myself for $10,
> it would be nice. Later!
> 
You could try 8 pin PIC micro,  5 volt regulator with capacitor, 
resistor on input pin, the VSS buffer should accept 5 volt logic.
total part cost with rad shack board should be under $5.00.
with 2 wires to rs232 port you could calibrate speedo.
alex 
 



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