Today's Message Index:
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1. 01:47 AM - MaxPulse and MaxDim (cherokee)
2. 03:27 AM - Re: What is the type of this pin? (johnnyblame)
3. 06:50 AM - Re: Re: p-lead signal conditioning or tach gen usage (Robert L. Nuckolls, III)
4. 06:51 AM - Re: Re: p-lead signal conditioning or tach gen usage (Robert L. Nuckolls, III)
5. 06:59 AM - Re: Jabiru regulator wiring and 2nd ground (Robert L. Nuckolls, III)
6. 09:19 AM - Re: Jabiru regulator wiring and 2nd ground (messydeer)
7. 11:56 AM - Re: Re: Jabiru regulator wiring and 2nd ground (Robert L. Nuckolls, III)
8. 08:38 PM - Re: Jabiru regulator wiring and 2nd ground (messydeer)
Message 1
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| Subject: | MaxPulse and MaxDim |
Hey list members. Just thought I would let you all know that we
completed our installation of the MaxPulse and MaxDim units in our 150,
4 months ago now. These things run cool and are a dream to install.
These correct so many problems we encounter as aircraft owners. Like
replacing the rheostats or the big dual dimmer that costs $1200 from
Cessna. Yikes.
You can see these at www.maxpulsemaxdim.com .
I see another member is gathering a group together for a special buy on
the MaxDim, I think I will join in that effort for our other Cub.
Mark
Eagle River, Alaska
Message 2
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| Subject: | Re: What is the type of this pin? |
Hi Overtorque
I read your post. In your post u show one pin it is push to on pin.
It use in the some electronics component.
The function of this pin is to set and reset circuit.
--------
r4
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=270910#270910
Message 3
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| Subject: | Re: p-lead signal conditioning or tach gen usage |
Yeah, but . . .
If you study the dynamics of the circuit with the transistor,
it's "active" window is only a few hundred millivolts wide defined
by the signal level where the transistor first starts to conduct
until it is saturated. Only "glitches" that exist within that widow
are transferred through . . . with gain.
A straight divider/zener network has an active window of
about 5 volts but no gain. None the less, the "filtering"
feature we're looking for is degraded. I'm not saying that
it won't work . . . give it a try. But you may find that
the little extra gain and tightening of the window to
be useful and easy to do. By the way, since your signal
of interest goes below ground, the bottom resistor in the
schematic you propose is probably not necessary.
Bob . . .
---------------------------------------
( It's MATRONICS FUND RAISER MONTH! )
( Do your part to keep this marvelous )
( tool sharp and available to all our )
( brothers in the OBAM aviation )
( community. )
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Message 4
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| Subject: | Re: p-lead signal conditioning or tach gen usage |
At 08:19 PM 11/3/2009, you wrote:
><capav8r@gmail.com>
>
>Bob:
>
>Well that got messed up when it posted! Basically, signal in goes
>to a voltage divider of 1K resistor and 50K resistor with a 5.1V
>Zener in parallel with the 50K resistor. The output goes to the
>comparator. Output of the comparator goes to the EFIS as a TTL level signal.
OH . . . you mean there are other electro-whizzies
posed between our pre-conditioning circuit and the
input to your EFIS?
I thought we were talking about the whole thing.
Perhaps you need to sketch the whole system for
me, I've been seeing it through a gray matter "knothole".
Bob . . .
---------------------------------------
( It's MATRONICS FUND RAISER MONTH! )
( Do your part to keep this marvelous )
( tool sharp and available to all our )
( brothers in the OBAM aviation )
( community. )
---------------------------------------
Message 5
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| Subject: | Re: Jabiru regulator wiring and 2nd ground |
At 08:54 PM 11/3/2009, you wrote:
>
>Hi!
>
>I am mounting my filter capacitor and alt disconnect relay on the
>cool side of the firewall. Voltage regulator and battery would be
>FWF. One alternator lead would go through the firewall to the COM
>terminal of the alt disconnect relay. From the regulator, one ltblu
>wire, the red wire, and the yel wire would go through the firewall
>to the filter capacitor. From the filter capacitor, there would be
>one wire come back through the firewall to the starter contactor.
>This is how I'd planned it a few months ago. The only changes were
>to downsize the wires.
>
>But today, I ran across the following on the US Jabiru website:
>
>We suggest keeping the red and yellow wires ahead of the
>firewall. We run them directly but separately to the battery.
>
>This differs from how I have it, since my red and yellow wires are
>not kept fwf. And they are not run directly to the battery, but go
>first to the filter capacitor, starter contactor, battery contactor
>and then to the battery. Is there any problem doing it how I have it?
>
>
>I also noticed in the Z drawings with the Jabiru regulator, Bob
>shows two grounds, one from the black wire and another drawn between
>the voltage regulator box to the firewall. I'm wondering if this
>ground drawing should be deleted.
It depends on the specific regulators . . . some regulators
require an electrical case ground for proper function
so I always show it . . . if the critter is mounted to your
conductive firewall, then it IS grounded whether electrically
necessary or not.
> The voltage regulator metal case certainly contacts the firewall, fwiw.
Yes . . . that's what that symbol is about.
You're mixing multiple recipes for success together
with predicable consternation. There's no good reason to
have just the relay and filter capacitor on the
cockpit side of the firewall. Good practice calls
for minimizing firewall penetrations.
If it were my airplane, I'd put all the alternator
stuff forward of the firewall and bring a
minimum of power distribution and control wires
through to the cockpit.
Bob . . .
---------------------------------------
( It's MATRONICS FUND RAISER MONTH! )
( Do your part to keep this marvelous )
( tool sharp and available to all our )
( brothers in the OBAM aviation )
( community. )
---------------------------------------
Message 6
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| Subject: | Re: Jabiru regulator wiring and 2nd ground |
> You're mixing multiple recipes for success together
> with predicable consternation. There's no good reason to
> have just the relay and filter capacitor on the
> cockpit side of the firewall. Good practice calls
> for minimizing firewall penetrations.
>
> If it were my airplane, I'd put all the alternator
> stuff forward of the firewall and bring a
> minimum of power distribution and control wires
> through to the cockpit.
I could certainly do that. The main reason I planned on putting them in the cabin
was because that's where the documentation for the relay and capacitor said
to put them. "Regulator and capacitor should be mounted in a cool place and should
be mounted on the cockpit side of the firewall" The diagram shows the battery,
alt disconnect relay, capacitor and voltage regulator behind the firewall.
Of these, only the battery has a fixed position fwf in a Sonex. I had planned
to put the regulator fwf mainly because that's where Jabiru has it.
As it's drawn now in my schematic, I have 5 wires going through the firewall between
the regulator, relay, and capacitor. Moving the regulator into the cabin
would cut that down to 3: the 2 alternator leads and the single wire from the
capacitor to the starter contactor.
Or I could mount all of these components fwf, which would eliminate all the firewall
penetrations shown and add just the 22awg alt relay coil wire going fwf.
It sounds like this latter way is how you would do it, which means less firewall
penetrations would trump having these components in the cooler cabin.
--------
Dan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=270967#270967
Attachments:
http://forums.matronics.com//files/504_500_rev_f_498.pdf
Message 7
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| Subject: | Re: Jabiru regulator wiring and 2nd ground |
>
>
>It sounds like this latter way is how you would do it, which means
>less firewall penetrations would trump having these components in
>the cooler cabin.
Virtually everybody would like to have their pride-n-joy
products mounted in the most benign location possible
aboard the airplane . . . lower risk. At the same time,
except for direct radiation from hot exhaust stacks, the
environment under the cowl isn't all that bad either.
The capacitor and relay are rated for temperatures
greater than what's expected under the cowl . . . so
make the installation clean and simple as opposed to
"cooler".
Bob . . .
---------------------------------------
( It's MATRONICS FUND RAISER MONTH! )
( Do your part to keep this marvelous )
( tool sharp and available to all our )
( brothers in the OBAM aviation )
( community. )
---------------------------------------
Message 8
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| Subject: | Re: Jabiru regulator wiring and 2nd ground |
Thanks, Bob :-)
--------
Dan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=271065#271065
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