my bad prom

[David Cooley]

At 07:23 AM 9/3/1999 -0400, you wrote:
>OK so I know my prom is junk.  It's a hypertech (no It is not the piggy
>back type-165ecm)now my OEM prom needs a signal from the vats module
>(5v at 30hz square wave) I have the OEM service manual from gm (it is the one
>that the mechanics use at the dealership, it's about 4"thick) I have access
>to allot of them (86-96 and EFI gm car/truck) If anybody is interested just
>email me. I can scan what you need and send it to you.  Anywayz,  the signal
>the vat needs, is the amplitude of the wave from 0-5v or is it -5v - +5v?
>How can I build something to bypass this?


I believe it's 0 to +5v... A simple 555 timer and a 7805 regulator would do it.
Radioshack has some pretty good (and simple) design books for the 555 for $2.00


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David Cooley N5XMT Internet: N5XMT at bellsouth.net
Packet: N5XMT at KQ4LO.#INT.NC.USA.NA T.A.P.R. Member #7068
We are Borg... Prepare to be assimilated!
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