Today's Message Index:
----------------------
1. 03:12 AM - Re: Electronic Circuit Breakers on your EFIS (Carlos Trigo)
2. 04:09 AM - Re: Batteries (icrashrc)
3. 04:17 AM - Metal Jacket (Tray) for PC680 (icrashrc)
4. 05:51 AM - An instrument question ()
5. 06:56 AM - S-Tec 30 GPSS internal fuse (Ralph E. Capen)
6. 06:57 AM - Re: Electronic Circuit Breakers on your EFIS (marcausman)
7. 07:19 AM - Re: S-Tec 30 GPSS internal fuse (Robert L. Nuckolls, III)
8. 07:58 AM - Re: Re: Flap Motor lack of Oomph (George, Neal E Capt USAF ACC 505 TRS/DOJ)
9. 09:11 AM - Re: Flap Motor lack of Oomph (jonlaury)
10. 09:57 AM - Source for Schumacher 1562A (Charles Brame)
11. 12:06 PM - Re: S-Tec 30 GPSS internal fuse (Ralph E. Capen)
12. 12:50 PM - Re: Source for Schumacher 1562A (Robert L. Nuckolls, III)
13. 01:12 PM - Re: Source for Schumacher 1562A (thomas sargent)
14. 01:14 PM - Re: Source for Schumacher 1562A (thomas sargent)
15. 01:14 PM - Re: Source for Schumacher 1562A (Harley)
16. 02:27 PM - Re: Source for Schumacher 1562A (Neal George)
17. 02:28 PM - Re: Source for Schumacher 1562A (David E. Nelson)
18. 02:35 PM - On the subject of checking voltage..... (MLWynn@aol.com)
19. 02:35 PM - On the subject of checking voltage..... (MLWynn@aol.com)
20. 02:35 PM - Re: Source for Schumacher 1562A (RGent1224@aol.com)
21. 05:09 PM - Re: On the subject of checking voltage..... (BobsV35B@aol.com)
22. 05:23 PM - TCW product availabilty (Bob-tcw)
23. 05:51 PM - Re: On the subject of checking voltage..... (Dj Merrill)
24. 06:14 PM - Re: On the subject of checking voltage..... (Tim Andres)
25. 09:34 PM - How do I prevent starter engaged LED from failing? (rparigoris)
Message 1
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Subject: | Electronic Circuit Breakers on your EFIS |
Hi Marc
Let me ask a couple of questions, one about VP-X in particular, and its
integration with the EFIS from GRT: why does it only work with the HX
and
not with the Sport?
A second question, more general, about your product: which technical
arguments do you have to not consider your box as a BIG single point of
failure of the electrical system?
Regards
Carlos
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-
> server@matronics.com] On Behalf Of marcausman
> Sent: quinta-feira, 25 de Mar=E7o de 2010 0:41
> To: aeroelectric-list@matronics.com
> Subject: AeroElectric-List: Electronic Circuit Breakers on your EFIS
>
> <marc@verticalpower.com>
>
> Vertical Power Announces VP-X
>
> The Electronic Circuit Breaker System that integrates with your EFIS.
>
> Vertical Power, along with its EFIS partners, is formally announcing
the
VP-X at
> Sun n Fun next month but we wanted to give you an early preview.
>
> The VP-X uses proven electronic circuit breakers to simplify wiring
and
provide
> advanced electrical system capabilities. Monitor the status of
individual
devices and
> the entire electrical system right from your EFIS. Avionics, lights,
trim,
and flaps can
> all be controlled using standard switches or the EFIS.
>
> The VP-X works with Advanced Flight Systems, Grand Rapids Technologies
HX,
> and MGL Voyager/Odyssey MKII EFIS products.
>
> For more information please see: http://www.verticalpower.com/VPX.html
>
> --------
> Marc Ausman
> http://www.verticalpower.com "Move up to a modern electrical
system"
> RV-7 IO-390 Flying
>
>
Message 2
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I have a fair bit of experience with A123's and yes, they would work fine for starting
your plane, or your car.
I've used a 10oz [4 cell] pack to jump start a Rotax 912ul 4 different times this
winter. All were at well below freezing temps.
I have a 16 cell pack ready to install in my 912uls powered plane when it's completed
this summer.
LiFe battery packs are not as simple as just hooking up 2 wires. I doubt they will
ever be mainstream until someone markets a complete drop in solution.
[quote="jef.vervoortw(at)telenet."]In september 2007, some messages promoted the
use of A123 Systems batteries. They should offer a substantial weight saving.
Anybody heard of recent developments?
Jef, 91031 wiring.
> [b]
--------
Scott
www.ill-EagleAviation.com
do not archive
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=291652#291652
Message 3
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Subject: | Metal Jacket (Tray) for PC680 |
While everyone is thinking about batteries and mounting. I have a new Metal Jacket
(Tray) for Odyssey 680 Amp battery. Aircraft Spruce shows part #11-02234 and
sells it for $22.50 plus shipping. $10 plus actual shipping and it's yours.
Scott
icrashrc@aol.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=291653#291653
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Subject: | An instrument question |
3/24/2010
Hello Charlie, Thanks for your kind words. I applaud your desire to learn.
You wrote:
1) ".......... some time down the road wish to have the aircraft IFR
certified....."
The FAA does not have a set process of having an aircraft IFR certified. The
tests and inspections required by 14CFR 91.413 are commonly referred to as a
"VFR cert".
The tests and inspections required by both 91.411 and 91.413 are commonly
referred to as an "IFR cert", but accomplishment and sign off of those tests
and inspections do not constitute any total approval of an experimental
amateur built aircraft for IFR flight.
The attached table will give you an overview of what is required for IFR
flight for an experimental amateur built aircraft.
2) "I must have installed instrumentation that is compliant to a TSO. Do I
understand that correctly?"
If we define instrumentation as a mechanical, electrical, or electronic
device installed in an aircraft that gives the pilot information regarding
the aircraft's internal status then the answer to your question is: No the
instrumentation does not have to be TSO'd.
But if you have devices installed that give information out externally to
the aircraft, or obtain information from sources external to the aircraft,
then the requirement for TSO'd hardware can become mandatory depending upon
what the pilot is doing with the aircraft. One needs to turn to the
regulations to determine which devices and which activities fall into the
TSO required category.
3) "Also, if correct, is this limited to flight instruments or are engine
management instruments (oil pressure, tach, etc) covered as well?"
I think that the answer to 2 above responds to this question.
4) "I am in the process of putting my panel together now and really don't
want to preclude IFR at some future time by putting a lot of cash into
instruments that would have to be replaced should I
wish to have an IFR airplane."
Good thinking. If, for example, you buy a crappy altimeter that can not pass
the 91.411 tests, or be adjusted or repaired to pass the tests sometime in
the future, then you will either have to replace it or limit your flying to
VFR.
5) "And if you don't mind, point me to the right place in the FAR maze so I
may keep it for future reference."
Unfortunately there is no one right place to look. I think that the little
static system test exercise recently posted (now available on Bob Nuckolls'
web site) showed us how interdependent the many different 14CFR provisions
can be. Hopefully the attached table will give the reader a good head start
on self education in this arena and this web site give us free almost
instant access to those regulations:
http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&tpl=/ecfrbrowse/Title14/14tab_02.tpl
6) "Thanks again for your expert advice."
You are welcome. I hope that your questions and the responses helped to
educate others as well. I do not consider myself an expert in any area
(except perhaps in trying to avoid annoying my wife and after over 50 years
I don't seem to be doing so well in that arena either), but instead a
willing, and sharing, student.
'OC' Says: "The best investment we can make is the effort to gather and
understand knowledge."
========================================
----- Original Message -----
From: "Charlie Smith" <ctsmith@netsurfusa.net>
Sent: Tuesday, March 23, 2010 7:30 PM
Subject: An instrument question
> OC,
>
> You're probably the ultimate guru of FAR's that I have contact with. May
> I ask you a couple questions?
>
> I understand from what you have written on the subject previously that, if
> I were so inclined, I am permitted to go to an auto parts store, purchase
> and install junk instrumentation in my homebuilt. But, should I at some
> time down the road wish to have the aircraft IFR certified, I must have
> installed instrumentation that is compliant to a TSO. Do I understand
> that correctly? Also, if correct, is this limited to flight instruments
> or are engine management instruments (oil pressure, tach, etc) covered as
> well? I am in the process of putting my panel together now and really
> don't want to preclude IFR at some future time by putting a lot of cash
> into instruments that would have to be replaced should I wish to have an
> IFR airplane. I understand that there are a whole host of other
> requirements (re. your static system recertification post) but for now I
> am just concerned with the panel.
>
> Thanks again for your expert advice. And if you don't mind, point me to
> the right place in the FAR maze so I may keep it for future reference.
>
>
> Charlie
Message 5
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Subject: | S-Tec 30 GPSS internal fuse |
Anyone else out there with S-Tec 30 and GPSS?
Any of you having issues with the internal fuse in the GPSS module?
Mine blew once during construction and was a real pain to ship back and have S-Tec
(whatever their name is now) solder in a new one. I attributed that to using
a power supply (even with a battery) to run my panel during build testing.
It has since blown again and I am trying to figure out a way to not have to
go through this PITA another time.
More importantly, what is causing this little critter to pop in the first place?
The rest of the panel works fine with no other avionics issues. I have gone back
to my engine monitor to look for any recorded voltage spikes....the highest
I have is 14.0 which should be within the normal operating range of the system
(?). I have spike catching diodes on my relays and have a process for powering
up and powering down stuff like this to prevent it from happening for other
reasons.
Your thoughts please,
Ralph Capen
RV6A N822AR @ N06 55hrs
Message 6
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Subject: | Re: Electronic Circuit Breakers on your EFIS |
We have a developer's kit and the EFIS vendor decides what systems to integrate
with the VP-X. So, let them know your interest to help them prioritize their
development resources.
The way to plan for single-point failures it to have backups. Your EFIS may have a backup EFIS or gauges as a backup, for example. The same is true for the electrical system. The VP-X is your primary power switching system, but you can install backup circuits for critical avionics (and quite simple to wire). It's very similar to how Bob shows an e-bus which provides backup power if the battery contactor fails. Our installation manual explains it in detail here: http://www.verticalpower.com/documents.html
Additionally, the VP-X has backup controls on the EFIS screen for all the electrical
devices (including trim and flaps) if a mechanical switch or wire connection
fails or position sensor goes haywire. Overall, you're replacing mechanical
components with solid-state components and significantly reducing the number
of connectors, modules, etc which we believe raises the overall reliability
of the electrical system.
There are numerous single points of failure in any aircraft design and with some
(like the VP-X, battery contactor, EFIS) you can mitigate those risks if a failure
occurs and some others (like the engine or the engine monitor) there are
no backups.
--------
Marc Ausman
http://www.verticalpower.com "Move up to a modern electrical system"
RV-7 IO-390 Flying
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=291667#291667
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Subject: | Re: S-Tec 30 GPSS internal fuse |
At 08:33 AM 3/25/2010, you wrote:
<recapen@earthlink.net>
Anyone else out there with S-Tec 30 and GPSS?
Any of you having issues with the internal fuse in the GPSS module?
Mine blew once during construction and was a real pain to ship back
and have S-Tec (whatever their name is now) solder in a new one. I
attributed that to using a power supply (even with a battery) to run
my panel during build testing. It has since blown again and I am
trying to figure out a way to not have to go through this PITA another time.
More importantly, what is causing this little critter to pop in the
first place?
The rest of the panel works fine with no other avionics issues. I
have gone back to my engine monitor to look for any recorded voltage
spikes....the highest I have is 14.0 which should be within the
normal operating range of the system (?). I have spike catching
diodes on my relays and have a process for powering up and powering
down stuff like this to prevent it from happening for other reasons.
It's likely that the problem has nothing
to do with anything you are doing . . . or
not doing. The fact that some electro-whizzy
for airplanes includes and internal fuse is
itself reason to query the skills/design
goals of the manufacturer. I have on occasion
included fusible link type performance inside
a product . . . designed to prevent burning traces
on an ECB should some downstream failure put a
trace at risk. But real fuses (read fast acting
and not particularly robust) does give pause to
wonder why it's in there.
If indeed the fuse is nuisance tripping because
of a REAL transient event on your system, then
I'm wondering if the electronics downstream of
that fuse were tailored to live with transient
events known to exist on the system (I.e. DO-160
style qualification).
How much current does this electro-whizzy draw
in normal operations? Do you know what size the
fuse is?
Bob . . .
Message 8
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Subject: | Re: Flap Motor lack of Oomph |
John -
Which power supply are you using, and what does the amp meter indicate when
the voltage is sagging toward the peg?
neal
Daniel,
My bench power supply has analog meters for volts and amps. When I hook it
up to the flap motor/linear actuator, the voltmeter almost pegs 0 volts.
John
Message 9
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Subject: | Re: Flap Motor lack of Oomph |
Daniel, thanks for that. I'll check out the motor/actuator with a charged battery
today.
Neal, the power supply brand escapes me right now, but when the volt meter pegs,
the amp meter shows approx 2 amps. I'll report back with the PS brand tonight.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=291677#291677
Message 10
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Subject: | Source for Schumacher 1562A |
Where are you guys finding the Shumacher 1562 battery chargers? I
looked at WalMart and they carry Shumacher battery chargers, but none
of them are labled 1562.
Charlie Brame
RV-6A N11CB
San Antonio
Message 11
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Subject: | Re: S-Tec 30 GPSS internal fuse |
Good points Bob,
This is a TSO'd device - part of an autopilot whose wiring is protected by a 5
amp fuse. I'll be taking a magnifying glass out to look at the markings on the
unit to determine its ratings. I agree with your questioning of the potential
lack of DO160 compliance from a common sense perspective.
My initial research in to these types of fuses show that there are holders that
could be installed to make the fuse ultimately field-serviceable...albeit painfully
field serviceable. This would allow the retention of the fuse the manufacturer
deemed required for whatever their reasons.
I'll post the info on the ratings that I discover.
Ralph
-----Original Message-----
>From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
>Sent: Mar 25, 2010 10:18 AM
>To: aeroelectric-list@matronics.com
>Subject: Re: AeroElectric-List: S-Tec 30 GPSS internal fuse
>
>
>At 08:33 AM 3/25/2010, you wrote:
><recapen@earthlink.net>
>
>Anyone else out there with S-Tec 30 and GPSS?
>
>Any of you having issues with the internal fuse in the GPSS module?
>
>Mine blew once during construction and was a real pain to ship back
>and have S-Tec (whatever their name is now) solder in a new one. I
>attributed that to using a power supply (even with a battery) to run
>my panel during build testing. It has since blown again and I am
>trying to figure out a way to not have to go through this PITA another time.
>
>More importantly, what is causing this little critter to pop in the
>first place?
>
>The rest of the panel works fine with no other avionics issues. I
>have gone back to my engine monitor to look for any recorded voltage
>spikes....the highest I have is 14.0 which should be within the
>normal operating range of the system (?). I have spike catching
>diodes on my relays and have a process for powering up and powering
>down stuff like this to prevent it from happening for other reasons.
>
> It's likely that the problem has nothing
> to do with anything you are doing . . . or
> not doing. The fact that some electro-whizzy
> for airplanes includes and internal fuse is
> itself reason to query the skills/design
> goals of the manufacturer. I have on occasion
> included fusible link type performance inside
> a product . . . designed to prevent burning traces
> on an ECB should some downstream failure put a
> trace at risk. But real fuses (read fast acting
> and not particularly robust) does give pause to
> wonder why it's in there.
>
> If indeed the fuse is nuisance tripping because
> of a REAL transient event on your system, then
> I'm wondering if the electronics downstream of
> that fuse were tailored to live with transient
> events known to exist on the system (I.e. DO-160
> style qualification).
>
> How much current does this electro-whizzy draw
> in normal operations? Do you know what size the
> fuse is?
>
> Bob . . .
>
>
Message 12
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Subject: | Re: Source for Schumacher 1562A |
At 10:36 AM 3/25/2010, you wrote:
>
>Where are you guys finding the Shumacher 1562 battery chargers? I
>looked at WalMart and they carry Shumacher battery chargers, but none
>of them are labled 1562.
I don't ALWAYS see them on the shelf at my various
visits to Walmart but they're available more often
than not.
Bob . . .
Message 13
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Subject: | Re: Source for Schumacher 1562A |
Amazon.com shows one for $17 and change.
On Thu, Mar 25, 2010 at 8:36 AM, Charles Brame <chasb@satx.rr.com> wrote:
>
> Where are you guys finding the Shumacher 1562 battery chargers? I looked
> at WalMart and they carry Shumacher battery chargers, but none of them are
> labled 1562.
>
> Charlie Brame
> RV-6A N11CB
> San Antonio
>
>
--
Tom Sargent
Message 14
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Subject: | Re: Source for Schumacher 1562A |
Amazon.com shows one for $17 and change.
On Thu, Mar 25, 2010 at 8:36 AM, Charles Brame <chasb@satx.rr.com> wrote:
>
> Where are you guys finding the Shumacher 1562 battery chargers? I looked
> at WalMart and they carry Shumacher battery chargers, but none of them are
> labled 1562.
>
> Charlie Brame
> RV-6A N11CB
> San Antonio
>
>
--
Tom Sargent
Message 15
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Subject: | Re: Source for Schumacher 1562A |
> At 10:36 AM 3/25/2010, you wrote:
>> <chasb@satx.rr.com>
>>
>> Where are you guys finding the Shumacher 1562 battery chargers? I
>> looked at WalMart and they carry Shumacher battery chargers, but none
>> of them are labled 1562.
Here it is on WalMart's website...and if they don't have it in your
store, order it on the website and they deliver to your local store for
free...
www.walmart.com/ip/Schumacher-SpeedCharge-Battery-Maintainer-and-Charger/13005742
Harley...
Message 16
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Subject: | Source for Schumacher 1562A |
Charlie -
My local Wal-Mart stocks them, but they're all the new style...
neal
-----Original Message-----
Where are you guys finding the Shumacher 1562 battery chargers? I
looked at WalMart and they carry Shumacher battery chargers, but none
of them are labled 1562.
Charlie Brame
RV-6A N11CB
San Antonio
Message 17
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Subject: | Re: Source for Schumacher 1562A |
Hi Charles,
Just bought mine earlier this week. I had to open the box and visually inspect
the unit to make sure it was a 1562A. The box itself is about 3" x 3" x 6" and
was in the automotive section.
Regards,
/\/elson
~~ Lately my memory seems to be like a steel trap .... without any spring. ~~
On Thu, 25 Mar 2010, Charles Brame wrote:
>
> Where are you guys finding the Shumacher 1562 battery chargers? I looked at
> WalMart and they carry Shumacher battery chargers, but none of them are
> labled 1562.
>
> Charlie Brame
> RV-6A N11CB
> San Antonio
>
>
Message 18
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Subject: | On the subject of checking voltage..... |
I have been following the Schumaker thread with some interest. I bought
one of the units and placed my batteries on it to keep them happy prior to
install in the airplane.
It occurred to me that I ought to check the charging voltages. I plugged
the unit it, made a harness to parallel the batteries and connected it up.
It charged for about twenty minutes and then went into maintain mode.
Seemed to be working exactly as advertised.
I have a really cheap voltmeter from somewhere. I don't really think I
can trust its reading to be all that accurate. I also have an IM-18 VTVM
from Heathkit. I used to work as a repairman for them, about four decades
ago. Great instrument, but when I fired it up, it was not working. Maybe a
bad tube. I am not sure I could get it calibrated anymore. Anyone with any
experience with that unit?
If I wanted to buy a quality multi-tester, for the battery and other
diagnostic uses, what would you suggest? What sort of price range do you need
to spend to get a quality instrument?
Regards,
Michael Wynn
RV 8 Finishing
San Ramon, CA
Message 19
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Subject: | On the subject of checking voltage..... |
I have been following the Schumaker thread with some interest. I bought
one of the units and placed my batteries on it to keep them happy prior to
install in the airplane.
It occurred to me that I ought to check the charging voltages. I plugged
the unit it, made a harness to parallel the batteries and connected it up.
It charged for about twenty minutes and then went into maintain mode.
Seemed to be working exactly as advertised.
I have a really cheap voltmeter from somewhere. I don't really think I
can trust its reading to be all that accurate. I also have an IM-18 VTVM
from Heathkit. I used to work as a repairman for them, about four decades
ago. Great instrument, but when I fired it up, it was not working. Maybe a
bad tube. I am not sure I could get it calibrated anymore. Anyone with any
experience with that unit?
If I wanted to buy a quality multi-tester, for the battery and other
diagnostic uses, what would you suggest? What sort of price range do you need
to spend to get a quality instrument?
Regards,
Michael Wynn
RV 8 Finishing
San Ramon, CA
Message 20
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Subject: | Re: Source for Schumacher 1562A |
Is this what you're looking for??
_http://www.walmart.com/catalog/product.do?product_id=13005742&findingMethod
=rr_
(http://www.walmart.com/catalog/product.do?product_id=13005742&findingMethod=rr)
Dick
In a message dated 3/25/2010 2:51:04 P.M. Central Daylight Time,
nuckolls.bob@aeroelectric.com writes:
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III"
<nuckolls.bob@aeroelectric.com>
At 10:36 AM 3/25/2010, you wrote:
>
>Where are you guys finding the Shumacher 1562 battery chargers? I
>looked at WalMart and they carry Shumacher battery chargers, but none
>of them are labled 1562.
I don't ALWAYS see them on the shelf at my various
visits to Walmart but they're available more often
than not.
Bob . . .
Message 21
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Subject: | Re: On the subject of checking voltage..... |
Good Evening Michael
Buy a Fluke meter.
Something around sixty to seventy bucks should be a very good one, but I
haven't purchased one in at least five years. Hopefully, someone else will
have more recent information, but Fluke is the leader. If you are into
nostalgia, Get a Simpson 260! <G>
Happy Skies,
Old Bob
AKA
Bob Siegfried
Downers Grove, IL
Stearman N3977A
LL22
In a message dated 3/25/2010 4:37:12 P.M. Central Daylight Time,
MLWynn@aol.com writes:
I have been following the Schumaker thread with some interest. I bought
one of the units and placed my batteries on it to keep them happy prior to
install in the airplane.
It occurred to me that I ought to check the charging voltages. I plugged
the unit it, made a harness to parallel the batteries and connected it up.
It charged for about twenty minutes and then went into maintain mode.
Seemed to be working exactly as advertised.
I have a really cheap voltmeter from somewhere. I don't really think I
can trust its reading to be all that accurate. I also have an IM-18 VTVM
from Heathkit. I used to work as a repairman for them, about four decades
ago. Great instrument, but when I fired it up, it was not working. Maybe a
bad tube. I am not sure I could get it calibrated anymore. Anyone with any
experience with that unit?
If I wanted to buy a quality multi-tester, for the battery and other
diagnostic uses, what would you suggest? What sort of price range do you need
to spend to get a quality instrument?
Regards,
Michael Wynn
RV 8 Finishing
San Ramon, CA
(http://www.matronics.com/Navigator?AeroElectric-List)
(http://www.matronics.com/contribution)
Message 22
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Subject: | TCW product availabilty |
Fellow builders,
Our new product, Integrated Back-up Battery System (IBBS) is
now available and in stock. This new product provides back-up power
for critical electronics in one simple and easy to install package.
IBBS combines a Ni-mh battery pack, charging and switching circuitry in
one convenient package for easy installation that weighs 1/2 of lead
acid battery solutions. IBBS has been designed to provide back-up
power to EFIS, Engine monitors, GPS and Auto-pilot systems. For those
going to Sun-n-Fun we will have a working demo of IBBS as well as all of
the other TCW products for you to see first hand.
All the details are available at: www.tcwtech.com
Thanks,
Bob Newman
RV-10 40176
TCW Technologies, LLC.
Message 23
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Subject: | Re: On the subject of checking voltage..... |
On 3/25/2010 4:14 PM, MLWynn@aol.com wrote:
> If I wanted to buy a quality multi-tester, for the battery and other
> diagnostic uses, what would you suggest? What sort of price range do
> you need to spend to get a quality instrument?
For basic battery tests and other simple diagnostics, about $3. These
work fine for pretty much any type of diagnostic test we would need to
do on our aircraft. I have about 4 of these kicking around in various
places, and they are as accurate as the more expensive one I bought some
20 years ago.
<http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=98025>
-Dj
--
Dj Merrill - N1JOV
Glastar Sportsman 2+2 Builder #7118 N421DJ - http://deej.net/sportsman/
Grumman Yankee Driver N9870L - http://deej.net/yankee/
Message 24
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Subject: | Re: On the subject of checking voltage..... |
You cant go wrong with a Fluke,- the 88 automotive model is a good bet bu
t they make dozens of good quality meters.=0ATim A=0A=0A=0A=0A=0A__________
______________________=0AFrom: "MLWynn@aol.com" <MLWynn@aol.com>=0ATo: aero
electric-list@matronics.com=0ASent: Thu, March 25, 2010 1:14:38 PM=0ASubjec
t: AeroElectric-List: On the subject of checking voltage.....=0A=0AI have b
een following the Schumaker thread with some interest.- I bought one of t
he units and placed my batteries on it to keep them happy prior to install
in the airplane.=0A=0AIt occurred to me that I ought to check the charging
voltages.- I plugged the unit it, made a harness to parallel the batterie
s and connected it up.- It charged for about twenty minutes and then went
into maintain mode.- Seemed to be working exactly as advertised.=0A=0AI
have a really cheap voltmeter from somewhere.- I don't really think I can
trust its reading to be all that accurate.- I also have an IM-18 VTVM fr
om Heathkit.- I used to work as a repairman for them, about four decades
ago.- Great instrument, but when I fired it up, it was not working.- Ma
ybe a bad tube.- I am not sure I could get it calibrated anymore.- Anyo
ne with any experience with that unit?=0A=0AIf I wanted to buy a quality mu
lti-tester,-for the battery and other diagnostic uses, what would you sug
gest?- What sort of price range do you need to spend to get a quality ins
trument?=0A=0ARegards,=0A=0AMichael Wynn=0ARV 8 Finishing=0ASan Ramon, CA
=======================
Message 25
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Subject: | How do I prevent starter engaged LED from failing? |
I think I remember reading if an LED is used instead of a bulb for starter engagement
indication, that you best add a diode to prevent the LED from getting hurt
when power is removed from starter motor.
Where does the diode get placed, in series with the LED or in parallel? If answer
is in parallel where would the dropping resistor for LED get placed, between
the legs of the protection diode, or outside?
What would the specs be for a diode to protect my LED (reverse voltage rating and
wattage)?
Could I use a Perihelion Snap-jack?
Install will be on my Rotax 914 which has a 12 volt starter motor of approx. .6kW
and the LED is yellow and draws ~ 30mAs.
Thx.
Ron Parigoris
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http://forums.matronics.com/viewtopic.php?p=291769#291769
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