I found this on the net. Can't cost that much to make.
http://martybugs.net/electronics/speedo.cgi

looks good but I was out of my depth in the second paragraph.

I'm not good with electrickery

Cheers

Chris

[Edited on 12/3/06 by chrisg]

It won't cost much, but it would be much simpler and very likely cheaper to use a micro such as a PIC instead of the discrete logic. It will also be far more stable, that design has it's clock derived from a 555 timer IC which will not be particularly stable over time or with temperature changes.

Yes, that's what I thought.

You definately need a wibble capacitor to enbongalate the resitivator.....

Cheers

Chris

i thought that if i removed the 555 timer and the wibble capacitor both could be replaced by some uranium housed in a flux capacitor. This would give a much more stable time signal - although would be subject to some other minor environmental issues.

Weapons grade plutonium would be better I think with a strontium core condenser, flux capacitors are so 90's.

yeah but i like retro - thats why i'm building a replica 50's sportscar!

quote:

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Originally posted by MikeR
i thought that if i removed the 555 timer and the wibble capacitor both could be replaced by some uranium housed in a flux capacitor. This would give a much more stable time signal - although would be subject to some other minor environmental issues.

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