Frequency signal multiplier - repost.

Hello all,

Repost with this extra info signal is 5.5 / 6.5 volts to vehicle earth and
is 1Hz per rev i.e. 650 rpm tickover = 0.65kHz.

I'm after advice for a simple frequency multiplier, I need to increase the
rev counter signal on my car by 1.5 i.e. if revs are 2000 I need a signal of
3000. So it needs to be 12 vdc supply 0 - 7000 rpm input 0 - 11000 output.
Capable of easy build on a bit of Vero board.

Its to give the correct rev signal to a LPG system I have fitted but for
some reason it only reads 2/3 of the rev's. It may be something to do with
the fact that its a V6 working on a lost spark system. I.e. the plugs fire
every rev not just on the compression stroke.

TIA.

George.



.

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