[s-cars] Staged shift light for 20V cars

[Achint Sandhu]

Hi,

	I would like to add a shift light for my 96 S6. The main idea is that I want
to have 10 LEDS (lighting at 200 RPM increments from 5000rpm to 7000rpm). I
can use the LM3914 LED driver (National Semiconductor) to accomplish this
fairly easily given a varying voltage signal. I was hoping that the stock
tach uses a voltage input and I could simply wire my circuit in parallel with
the stock tach.

	I haven't been able to find any data on the Audi tach, but from what I can
see with other tachs, they rely on pulse measurement to generate the output.
If that is indeed the case with the Audi tach I was thinking of using a
LM2917 frequency to voltage convertor (National Semiconductor) to create the
input for the LM3914.

	I am a computer programmer, hence I next to nothing about hardware and came
up with the "design" (if it can be called that) based on some example
circuits I saw on the net. The above may not even be possible and with a high
probability is a moronic design :-)

	Any help/information that can be provided would be great. Thanks in
advance....

Cheers,
Achint

--
"Weaseling out of things is important to learn. It's what seperates us from
the animals. Except the weasel."
		--Homer Simpson