Received-SPF: pass
 receiver=logan.com; client-ip=72.52.218.78; envelope-from=bob@bob-white.com
Date: Sat, 4 Oct 2008 07:56:24 -0600
From: Bob White <bob@bob-white.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Coil trigger signal
Message-Id: <20081004075624.42e20c31.bob@bob-white.com>
In-Reply-To: <list-3199141@logan.com>
References: <list-3199141@logan.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit

Steve,

Thanks for the offer, but for simplicity I would rather connect the
tach directly without any external circuitry.  I'm pretty sure the guy
with the Prius was using a 5 volt signal to drive his tach so I just
need to find out what adjustment I need to make to get the one shot in
the tach to fire with a 5 volt input.

Bob W.

On Sat, 4 Oct 2008 08:39:28 -0400
"Steve Brooks" <cozy4pilot@gmail.com> wrote:

> 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/
> 
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
> 
> 
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html


-- 
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/