Today's Message Index:
----------------------
1. 12:05 PM - Re: Battery disconnect with dual battery and trickle charger (Bill Watson)
2. 04:29 PM - MAC 3 LED Trim Indicator... (Matt Dralle)
3. 05:00 PM - Re: MAC 3 LED Trim Indicator... (Charlie England)
4. 05:10 PM - Re: PTT, snap action or not? (Robert L. Nuckolls, III)
Message 1
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Subject: | Re: Battery disconnect with dual battery and trickle |
charger
On 2/9/2019 6:03 PM, Robert L. Nuckolls, III wrote:
>> I was one of those people who ruined a number of O-680s with a
>> Battery Tender branded maintainer. It was established that it was an
>> earlier version than that being mentioned here, probably manufactured
>> circa '85.
>
> Hmmmm . . . didn't know they went back
> that far. Doubt that they were software
> driven. I didn't start using them until
> about 1998 . . . in fact, the top-off/
> maintainer curves I've published were
> probably produced by one of my earliest
> examples.
>
I may be mistaken on the date. When I started my build back in 2006, I
dusted off all my old charging equipment from my glider flying days
which ended in '95. When I started trying to diagnose my battery
maintaining problems, with this site's help, in 2009 or so, it became
clear that my old charging equipment was part of the problem so I threw
it all out. I know some of it dated back to '85 but the Battery Tender
branded unit might have been acquired later. So please disregard.
>> I try to cross connect the 2 buses before landing at night but
>> sometimes forget. When I forget, I try to top off the battery.
>> Don't really know if it's a problem or not.
>
> Do you know what the drain is on
> the battery . . . and for how long?
No I don't.
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Message 2
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Subject: | MAC 3 LED Trim Indicator... |
Hello,
A fellow homebuilder friend of mine has a old-style three-LED (Red|Green|Red) MAC
Trim Position Indicator. The Green LED was burned out, and the wires were
cut off too short.
I told him I would try to replace the LED and lead wires. I got it apart without
completely destroying it. But the internal wiring and polarity of the LEDs
isn't that clear to me, nor is the actuation of it through a servo electronically.
I'm not sure how to activate three LEDs with only three wires? (Or did there
used to be four wires?)
Does anyone have a PDF schematic of the 3-LED MAC Trim Indicator that you could
email to me?
Or better yet, does anyone have a spare or unused one of these they would like
to sell me?
Thank you,
Matt Dralle
Matt G Dralle | Matronics | 581 Jeannie Way | Livermore | CA | 94550
925-606-1001 V | 925-606-6281 F | dralle@matronics.com Email
http://www.matronics.com/ WWW | Featuring Products For Aircraft
Message 3
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Subject: | Re: MAC 3 LED Trim Indicator... |
On 2/16/2019 6:27 PM, Matt Dralle wrote:
>
> Hello,
>
> A fellow homebuilder friend of mine has a old-style three-LED
> (Red|Green|Red) MAC Trim Position Indicator. The Green LED was burned
> out, and the wires were cut off too short.
>
> I told him I would try to replace the LED and lead wires. I got it
> apart without completely destroying it. But the internal wiring and
> polarity of the LEDs isn't that clear to me, nor is the actuation of
> it through a servo electronically. I'm not sure how to activate three
> LEDs with only three wires? (Or did there used to be four wires?)
>
> Does anyone have a PDF schematic of the 3-LED MAC Trim Indicator that
> you could email to me?
>
> Or better yet, does anyone have a spare or unused one of these they
> would like to sell me?
>
> Thank you,
>
> Matt Dralle
Is it accessible enough to clip-lead the LED in for testing? If so, just
pick a direction. If it works, you're done. If it doesn't, reverse the
leads. Assuming that the current limiting is done external to the LED
itself, it won't matter if you insert it backward; it just won't light up.
Charlie
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Subject: | Re: PTT, snap action or not? |
At 05:41 AM 2/14/2019, you wrote:
>Thank you Bob and Charlie. The AeroElectric list never fails to deliver.
>
>So, it sounds like a PTT switch that clicks when
>pushed (snap action) or not really doesn't
>matter. I didn't think it did, but I wondered if
>one was preferred over another.=C2
>
>My current button on the (throw over) yoke
>(Debonair) does not, but the copilot side on the
>panel does. I think I prefer the click.
>
>Regards,
>Jim
really small tactile feedback, panel
mount push buttons are not common
catalog items. That one I showed you
mounts in a 1/2" hole and probably
wouldn't fit in a classic horn grip.
This button has been around since I
can remember . . . these were optional
on the control horns on Cessnas and
tied them into the PTT system via a
drooping coil cord under the yolk.
https://tinyurl.com/y2neb9nf
Very small and easy to mount.
Bob . . .
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