Today's Message Index:
----------------------
1. 07:48 AM - Re: Fw: LVWM and Kilovac contactors (Gilles Thesee)
2. 08:25 AM - Pinout or installation manual for KLN-90A? (Stephen J. Soule)
3. 09:53 AM - Re: Pinout or installation manual for (Robert L. Nuckolls, III)
4. 10:19 AM - Tach sender (Steve Sampson)
5. 10:48 AM - Re: Pinout or installation manual for KLN-90A? (Stephen J. Soule)
6. 08:55 PM - Voltage reduction circuit design (mkejrj@comcast.net)
7. 09:16 PM - Voltage reduction required for Garmin GPS (mkejrj@comcast.net)
8. 09:29 PM - Re: Voltage reduction circuit design (Robert McCallum)
9. 09:47 PM - Re: Voltage reduction required for Garmin GPS (James Freeman)
Message 1
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| Subject: | Re: LVWM and Kilovac contactors |
--> AeroElectric-List message posted by: "Gilles Thesee" <Gilles.Thesee@ac-grenoble.fr>
Hi Bob and all,
Here is the test I'm intending to conduct next week :
- Change the relay : I'll replace the existing finnicky relay with an NAIS
DK1a I happen to have in my box. It is 10 amp/ 12V relay with 8.4 VDC pick
up voltage and 1.2 VDC drop out voltage. These values should -hopefully-
insure correct operation everytime the e-bus is powered, regardless of any
reasonable noise or bus voltage fluctuation.
Otherwise what other step would you suggest ?
Thanks,
Gilles
----- Original Message -----
From: "Gilles Thesee" <Gilles.Thesee@ac-grenoble.fr>
Subject: Re: Fw: AeroElectric-List: LVWM and Kilovac contactors
> --> AeroElectric-List message posted by: "Gilles Thesee"
<Gilles.Thesee@ac-grenoble.fr>
>
> Bob,
>
> Thank you for responding.
>
> I'm mystified by your experience. I'm wondering
> > what the Kilovac contactor uses in the way of electronics
> > for holding current reduction and if that feature has
> > some noise that interacts with the LVM/ABMM modules.
> >
>
>
> In fact I believe I traced the problem down to the small relay that powers
> the LVWM. I removed the LVWM fuse and the problem still seemed to be with
> the relay. I made the same test with a different relay : same problem.
>
> > Just for grins, can you put your hands on one of those
> > el-cheepo contactors. Substituting a plain-vanilla contactor
> > for the Kilovac product would, by process of elimination,
> > point us in the right direction.
>
>
> This is what I did : I removed a standard contactor from an aerobatic
> airplane and tested it with jumpers : no more problems, the small relay
and
> the LVWM operate as intended.
> What mystifies me is that the contactor powers the e-bus, and the relay
> should not care who's bringing power to the bus. I thought about the noise
> issue, but how come this noise disturbs only the relay in question ?
> I'm intending to conduct any investigation needed to sort out the problem.
> Would it help to wire a diode between the plus contact and the relay coil
> lead ?
>
> Thanks ,
> Gilles
Message 2
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| Subject: | Pinout or installation manual for KLN-90A? |
--> AeroElectric-List message posted by: "Stephen J. Soule" <SSoule@pfclaw.com>
Good Morning,
Anyone out there have a pinout for the Bendix King KLN-90A?
Even better, an installation manual that they want to part with?
Email me off list if you want to.
Stephen Soule
ssoule@pfclaw.com
Swanton, Vermont
N227RV RV-6A flying
N222SZ RV-8 under construction
Message 3
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| Subject: | Re: Pinout or installation manual for |
KLN-90A?
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <b.nuckolls@cox.net>
KLN-90A?
At 11:27 AM 12/22/2004 -0500, you wrote:
>--> AeroElectric-List message posted by: "Stephen J. Soule"
><SSoule@pfclaw.com>
>
>Good Morning,
>
>Anyone out there have a pinout for the Bendix King KLN-90A?
>
>Even better, an installation manual that they want to part with?
>
>Email me off list if you want to.
I've posted what I have for pinouts at:
http://www.aeroelectric.com/Installation_Data/KLN90-90A-90B.pdf
Bob . . .
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Message 4
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--> AeroElectric-List message posted by: "Steve Sampson" <SSampson.SLN21@london.edu>
I have just bought the tach sender fromVANS that screws on the back of the
engine. It ( IE VTACHGEN2) has 3 leads on it. Red Black and White.
I assume:
Red - 12V
Black - Ground/Earth
White - Signal.
Can anyone confirm my assumption about the black and white leads is correct.
It has no docs.
Thanks, Steve
RV9a #90360
G-IINI
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Message 5
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| Subject: | Pinout or installation manual for KLN-90A? |
--> AeroElectric-List message posted by: "Stephen J. Soule" <SSoule@pfclaw.com>
Thank you very much.
Steve
-----Original Message-----
I've posted what I have for pinouts at:
http://www.aeroelectric.com/Installation_Data/KLN90-90A-90B.pdf
Bob . . .
Message 6
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| Subject: | Voltage reduction circuit design |
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--> AeroElectric-List message posted by: mkejrj@comcast.net
I'm installing a Garmin GPS 18 LVC to provide Nav data to my TRUTRAK Pictoral Pilot.
The specs for the Garmin indicate it will operate at from 4 to 5.5 volts
; also that the unit needs 60 mv of current at 5 volts.The vendor cautions that
higher voltage will fry the unit.
I would be very grateful to any electrical Guru type who will assist me in designing
a circuit that will reduce Bus Voltage and Current to the specified level.
I tried to use Bob's first chapter to determine the amount of Resistance required
to drop Line Voltage 7 Volts ( from 12 to 5 ) at 60 mv and came up with a required
resistor value of 116.6 OHMS.. I don't feel comfortable with my methodology
or my answer and would appreciate assistance.
Thanks in advance,
Dick Jordan
RV 8A
I'm installing a Garmin GPS 18 LVC to provide Nav data to my TRUTRAK Pictoral Pilot.
The specs for the Garmin indicate it will operate at from 4 to 5.5 volts
; also that the unit needs 60 mv of current at 5 volts.The vendor cautions that
higher voltage will fry the unit.
I would be very grateful to any electrical Guru type who will assist me in designing
a circuit that will reduce Bus Voltage and Current to the specified level.
I tried to use Bob's first chapter to determine the amount of Resistance required
to drop Line Voltage 7 Volts ( from 12 to 5 ) at 60 mv and came up with a required
resistor value of 116.6 OHMS.. I don't feel comfortable with my methodology
or my answer and would appreciate assistance.
Thanks in advance,
Dick Jordan
RV 8A
Message 7
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| Subject: | Voltage reduction required for Garmin GPS |
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--> AeroElectric-List message posted by: mkejrj@comcast.net
I'm installing a Garmin GPS 18 LVC which operates at from 4 to 5.5 volts and uses
60 mv of current at 5 volts.
I would appreciate any help on how to reduce the line voltage and current to the
required values.
I took a stab at computing the size of the Resistor required and my answer is 116.6
OHMS. I don't feel very comfortable with this answer and, even assuming it
is correct, don't know how to implement it.Does one simply purchase a Resistor
of that exact value and wire it in?
Thanks in advance for your help,
Dick Jordan
I'm installing a Garmin GPS 18 LVC which operates at from 4 to 5.5 volts and uses
60 mv of current at 5 volts.
I would appreciate any help on how to reduce the line voltage and current to the
required values.
I took a stab at computing the size of the Resistor required and my answer is 116.6
OHMS. I don't feel very comfortable with this answer and, even assuming it
is correct, don't know how to implement it.Does one simply purchase a Resistor
of that exact value and wire it in?
Thanks in advance for your help,
Dick Jordan
Message 8
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| Subject: | Re: Voltage reduction circuit design |
--> AeroElectric-List message posted by: Robert McCallum <robert.mccallum2@sympatico.ca>
Dick
First of all, your units of measure are very suspect. Current is not
measured in mv (millivolts) but in ma (milliamps) So- - - assuming this
is just a typo and your requirements are to create a voltage drop of 7
volts across a resistance while a current of 60 ma is flowing, then
according to ohms law which states E=IR then R=E/I. In your specific
numbers R=7/.060 which = 116.7 ohms as you stated. The power dissipated
in this resistor will be I2 x R which would be .06 X .06 x 116.7 = .42
watts. Therefore a 1/2 watt resistor would suffice. If however the
current drawn by the unit is not constant and the 60 ma is an average or
a maximum or ???? then as the current drawn by the device varies so then
will your applied voltage. Not good. If the current drawn by the unit
isn't constant and falls to say 20 ma then your 116.7 ohm resistor will
only drop E=.02 X 116.7 = 2.3 volts and you will be applying 14 - 2.3 =
11.7 volts to the unit while your alternator is keeping buss voltage at
14 volts. A resistor can be used for providing a reduced voltage only if
the load is constant. Do you have any assurance that in this
application the load is constant??? A better solution would be a proper
power supply which will provide the required 5 volts regardless of load
variation. There are many simple circuits which can accomplish this but
all are more complex than a single resistor.
Bob McC
mkejrj@comcast.net wrote:
>--> AeroElectric-List message posted by: mkejrj@comcast.net
>
>I'm installing a Garmin GPS 18 LVC to provide Nav data to my TRUTRAK Pictoral
Pilot. The specs for the Garmin indicate it will operate at from 4 to 5.5 volts
; also that the unit needs 60 mv of current at 5 volts.The vendor cautions that
higher voltage will fry the unit.
>
>I would be very grateful to any electrical Guru type who will assist me in designing
a circuit that will reduce Bus Voltage and Current to the specified level.
>
>I tried to use Bob's first chapter to determine the amount of Resistance required
to drop Line Voltage 7 Volts ( from 12 to 5 ) at 60 mv and came up with a
required resistor value of 116.6 OHMS.. I don't feel comfortable with my methodology
or my answer and would appreciate assistance.
>
>Thanks in advance,
> Dick Jordan
> RV 8A
>
>
>
Message 9
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| Subject: | Re: Voltage reduction required for Garmin GPS |
--> AeroElectric-List message posted by: James Freeman <flyeyes@mac.com>
There are multiple experts on the list, but since I lurk more than help
lately I'll try this one ;-)
You can go to Radio Shack (or Digikey, or Mouser, or anywhere) and buy
a part called a 7805 regulator for about a buck. This little gizmo
will take your bus voltage and regulate it to 5v. At 60ma, you
probably don't even need to heat sink it. The wiring diagram (pinout)
is on the package.
James Freeman
Worlds Slowest QB RV8 (soon though...)
On Dec 22, 2004, at 11:15 PM, mkejrj@comcast.net wrote:
> --> AeroElectric-List message posted by: mkejrj@comcast.net
>
> I'm installing a Garmin GPS 18 LVC which operates at from 4 to 5.5
> volts and uses 60 mv of current at 5 volts.
>
> I would appreciate any help on how to reduce the line voltage and
> current to the required values.
>
> I took a stab at computing the size of the Resistor required and my
> answer is 116.6 OHMS. I don't feel very comfortable with this answer
> and, even assuming it is correct, don't know how to implement it.Does
> one simply purchase a Resistor of that exact value and wire it in?
>
> Thanks in advance for your help,
> Dick Jordan
>
> I'm installing a Garmin GPS 18 LVC which operates at from 4 to 5.5
> volts and uses 60 mv of current at 5 volts.
>
> I would appreciate any help on how to reduce the line voltage and
> current to the required values.
>
> I took a stab at computing the size of the Resistor required and my
> answer is 116.6 OHMS. I don't feel very comfortable with this answer
> and, even assuming it is correct, don't know how to implement it.Does
> one simply purchase a Resistor of that exact value and wire it in?
>
> Thanks in advance for your help,
> Dick Jordan
>
>
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