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Reply-To: <cozy4pilot@gmail.com>
From: "Steve Brooks" <cozy4pilot@gmail.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
In-Reply-To: <list-3197057@logan.com>
Subject: RE: [FlyRotary] Coil trigger signal
Date: Sat, 4 Oct 2008 08:39:28 -0400
Message-ID: <DLEMJBMGBBMNJKHLCIIBCEFODCAA.cozy4pilot@gmail.com>
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Bob,
There used to be a tach output, 12 pulses per revolution as I recall, but
Tracy did away with it on one of the revisions.  I know this because I was
using that to drive my automotive tach, and also a canopy lock warning if
the RPMs exceeded 3500 RPM's and the canopy was not locked.

I sent my EC-2 off for an upgrade, and when I got it back, the tach didn't
work.  After talking to Tracy, he told me that he did away with it, because
of some potential interaction with the controller and whatever that pin is
hooked to.  He did tell me that I could use a pull up resistor and tat pin
would still work, but to keep the resistance as high as possible.  Since I
was using a cmos chip for my divider, I was able to put a 100K resister from
the +12 volt to the input on my divider circuit.  It worked great, and I
have not had any issues at all with that circuit.

I actualy have The tach driver, Canopy lock warning, and a 5 minute fuel
transfer timer and the circuit board.  All I have is my hand drawing of it,
but if you want it, I could scan it and email it to you.  All of the parts
are readily available.  I have it mounted in a small plastic case with a
terminal strip on the outside.  It also has the warning beeper mounted to
the box, and there is a relay in the box to switch on the tranfer fuel pump.

Steve Brooks


-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
Behalf Of Bob White
Sent: Thursday, October 02, 2008 4:40 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Coil trigger signal


Tracy is on vacation for a while and I need to find out what the coil
trigger pulse signal looks like.  Anyone know?

This is in reference to recalibrating John Downing's tachometer.  I
will publish what I've done as soon as I have it working.

Bob W.

--
N93BD - Rotary Powered BD-4 - http://www.bob-white.com
3.8 Hours Total Time and holding
Cables for your rotary installation - http://roblinstores.com/cables/

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