Allan said...

> I am not using the EI gauge, and have rather opted
> for different
> resistive float type gauges. I will be designing a
> circuit to drive any
> resistive gauge using a PIC microprocessor which can
> be calibrated
> accurately. However for me to get started on the
> design I need to
> know the frequency range from full to empty in the
> tanks so I can
> get started. I will share the design with anyone
> that's interested.

Hi Allan,

I've just done what you're setting out to do and would
be glad to let you have what I've done. The frequency
range for my 9 foot probes is 1.5 KHz (full) to 3.0
KHz (empty). The empty capacitance of the probe is
around 114pF.

My fuel gauges are Mitchell 1" square gauges. The
"Fuel Thing" as I call it is based on PIC
microprocessors and has a neat feature that "freezes"
the gauges during radio transmission.

I can let you have the schematic and source listing,
and look up table.

Pat Weston
Lancair Super ES N747PW
"Just three short years to go!"


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