Well, Paul, You know the standard answer on s.e.d, use a PIC ;-)
...Jim Thompson
-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et |
I posted some photos on alt.binaries.schematics.electronic.
There are two of them on a '79 Porsche 928 Central Warning Computer.
My CWC is starting to get a little flakey. It monitors numerous analog inputs, including various lamp currents and illuminates the central warning idiot light as needed. Mine is starting to generate phantom alerts. Based on the make (Porsche) and age, a replacement is probably going to be expensive, so I'm going to attemt to roll my own. Partly for the fun of it as well.
-- Paul Hovnanian mailto:Paul@Hovnanian.com ------------------------------------------------------------------
....or a 555. (or was that last year's solution?)
-- Keith
Hello Paul,
This post didn't seem to propagate into the Pacbell server so I can't see it. But I see mainly two options:
Get connectors in better shape or maybe even a whole CWC from a salvage yard.
Contact distributors in Germany who might have such connectors. Example:
Or look closely whether there is a logo from Panduit, T&B, AMP or whatever somewhere on the shells or inserts. This might require a really strong light. Finding ever so faint logos has helped me more than once.
Another thing I found when driving a really old Ford Cortina in the UK was that some receptacles need a slight bending inwards to create a stronger contact force. Else I'd still sit on the road to Durness ;-)
Regards, Joerg
No smiley needed. That's what I had in mind.
I can get better data from the analog inputs to identify intermittents, bad input data from transducers that have gone t/u and log events with time stamps.
-- Paul Hovnanian mailto:Paul@Hovnanian.com ------------------------------------------------------------------
When the PIC fails its time to get out the 20 Lb sledge. ;-)
-- Former professional electron wrangler. Michael A. Terrell
Ah, just bypass it. All you really _need_ is the oil pressure light and the generator light... :)
I would agree. I googled for a 928 central warning computer and found an interesting site that supplies 928 parts. I especially like the brake light switch for $28. The reason I like it is that it's a VW part number for the very same switch that any VW aftermarket shop will sell you for $4.
The prongs look like standard 1/4" push-on connectors. The cheap way would be to use a bunch of individual 1/4" connectors crimped to discrete wires. A slightly more elegant way might be to make a small circuit board and use PC-mountable male push-ons. Plug the board into the female connector in the harness and put a couple of zip ties around the assembly to hold it together.
Matt Roberds
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