Today's Message Index:
----------------------
1. 05:12 AM - Dimmer trick (Carlos Trigo)
2. 05:36 AM - Re: Re: Diode Wiring (Robert L. Nuckolls, III)
3. 05:43 AM - Re: Dimmer trick (Robert L. Nuckolls, III)
4. 06:05 AM - Re: NAV Troubleshooting (William Gill)
5. 06:05 AM - Inverting the sense for warning tone controls (Robert L. Nuckolls, III)
6. 06:28 AM - Dimmer trick (James H Nelson)
7. 06:35 AM - Roger Revenson - radios (Fergus Kyle)
8. 09:40 AM - Re: Inverting the sense for warning tone controls/ audio mixer/ stereo music amp (Vernon Little)
9. 02:42 PM - Re: Dimmer trick (Peter Laurence)
10. 02:57 PM - Re: Millivolt Power Source? (Eric M. Jones)
11. 05:10 PM - VOR won't show to indication. (Matthew Schumacher)
12. 06:22 PM - Re: Contactor Diodes (Dave VanLanen)
Message 1
INDEX | Back to Main INDEX |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Listers
I completed my instrument lights circuit, in which I have a dimmer, and all
works OK.
Nevertheless, when I tested it at night (still at my garage) I noticed that
there are a couple of instruments (e.g. the Trutrak ADI) which have a
brighter light than the others, and obviously the single dimmer, operating
all lights simultaneously, doesn't get me an optimal dimming position for
all lights at the same time.
Is there a trick to obtain similar brightness in all lights?
Can that be achieved by simply installing resistors in the brighter ones?
Carlos
Message 2
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Diode Wiring |
>
>
> > >Just received the diode assembly from B&C for the main bus to endurance
> > >bus wiring. The wiring diagram that came with it shows two of its
> > >terminals joined going to the main bus. In the Aero Connection, Bob says
> > >only one of the terminals goes to the main bus and the other two can be
> > >removed.
> > >
> > >Please clarify--which is correct?
> >
> > Flip a coin . . . it doesn't matter much.
> > SOMETIMES . . . the two paralleled diodes
> > match close enough to sort-of share the
> > loads but It's poor practice to depend on
> > it. How big are your e-bus loads?
> >
> > Bob . . .
>
>
>E-BUS loads about 3.5 amps; maximum 9.5.
>Roger.
Mount the diode to a metal surface, wiring
to one diode is sufficient, two diodes doesn't
hurt anything.
Bob . . .
Message 3
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Dimmer trick |
At 01:08 PM 6/22/2008 +0100, you wrote:
>Listers
>
>
>I completed my instrument lights circuit, in which I have a dimmer, and
>all works OK.
>
>Nevertheless, when I tested it at night (still at my garage) I noticed
>that there are a couple of instruments (e.g. the Trutrak ADI) which have a
>brighter light than the others, and obviously the single dimmer, operating
>all lights simultaneously, doesn t get me an optimal dimming position for
>all lights at the same time.
>
>
>Is there a trick to obtain similar brightness in all lights?
>
>Can that be achieved by simply installing resistors in the brighter ones?
Whatever you want to try is fair game. While heading
the electrical avionics group on the GP-180 at Lear,
I crafted a specification for a 4-channel panel dimmer
that featured separate dimming curves for incandescent,
EL, gas discharge and LED lighting. We were able to
make the entire suite of technologies track each other
from one knob.
It's not a trivial task and many builders install
separate dimmers for each technology. Setting
up cockpit lighting was probably the worst job
any electron-herder could contemplate for a
complex TC aircraft back then. We had a real
witches brew of technologies and every program
manager, test-pilot and vp of engineering had
his/her own idea of how things should work.
No matter what you did, somebody was less than
thrilled about it.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 4
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | NAV Troubleshooting |
Hello Jim,
If the navaid is on the field where you're based, you could use an
antenna from a portable com radio and connect it to the nav coax from
each radio BEFORE the splitter to confirm operation of each radio. Then,
work downstream if that worked.
Bill
RV-7 N151WP
Lee's Summit, MO
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Jim
Piavis
Sent: Saturday, June 21, 2008 7:17 PM
Subject: AeroElectric-List: NAV Troubleshooting
I've recently started flying my RV-7 with a Garmin 480/ SL-30. NAV
antenna is an Archer antenna in the right tip. Strobe/ nav light cables
are run per Archer instructions along leading edge of the antenna. COM
works great on both radios, but I'm getting nothing for NAV and need to
troubleshoot the problem. The single coax hits a splitter, which feeds
the 480 and SL-30.
What's the best method for troubleshooting?
Thanks,
Jim
RV-7
Redmond, WA
Message 5
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Inverting the sense for warning tone controls |
A number of builders who are incorporating DIY warning
tone generators in their projects are finding situations
where closing a contact to ground is the best way to
enable a particular tone. The drawings in Chapter 18
only accommodate a open-ground-for-tone function.
I've published a simple modification to the schematic
that will provide the close-ground-for-tone operation.
This same mod can be applied to any of the three
generators.
http://aeroelectric.com/Pictures/Schematics/Control_Sense_Inversion.pdf
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 6
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Carlos,
The ADI Tru Trak instrument has a seperate dimmer circuit inside
it. It requires a seperate 12v input to make it work. If I remember, by
applying the 12v to this wire, it dims the lighting on the instrument. I
added a seperate mini toggle along side the instrument that says "dim".
Check your wiring schematic for the ADI and I think you will find the
input required. I havn't used it as I'm just about to do my first
flight. Its been at the airport for about two months while I "put it
together" for the last time so I can not tell you how it worked.
Jim Nelson
N15JN
RV9-A
____________________________________________________________
The Two Coreys-New Season
Child Stars. Adult Issues. New season of the Two Coreys airs Sundays 1
http://thirdpartyoffers.juno.com/TGL2141/fc/JKFkuJi7WQr3rI2jU1sRgD264LX2qc79rxhctcWIsJha9dEa2CfXwV/
Message 7
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Roger Revenson - radios |
Roger,
If it's any help, I worked the city here as Antenna system
troubleshooter for amateur radio for about 20 years. In almost every
problem, the solution turned out to be connectors, and BNC modes in
particular, although others were there.
The usual cause was homemade connections, not following EXACTLY the
instructions or not having the correct tools - (Soldering equipment), such
as dripped solder, tiny wires running loose, etc. 9 times of 10, I went to
the antenna cable connector and found the fault.
For efficiency, I would concentrate on the connector(s) first. I
don't want to appear pushy but might suggest getting an old hand from the
local radio club interested. They often are intrigued by radio trouble and a
second discipline in the think tank is useful.
Good luck,
Ferg
Message 8
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Inverting the sense for warning tone controls/ |
audio mixer/ stereo music amp
For those who are not interested in the DIY approach, here's my link to a
tone annunciator module that will perform either active high or active low
sensing. For fans of Bob's work, there's actually a family of devices
inspired by what he's done, updated and packaged as complete products. This
includes a 10-channel audio mixer/amp (aka isolation amplifier), a stereo
music headphone amplifier and the tone annunciator.
For more information:
www.vx-aviation.com
Thanks, Vern Little
-----Original Message-----
<snip>
A number of builders who are incorporating DIY warning
tone generators in their projects are finding situations
where closing a contact to ground is the best way to
enable a particular tone. The drawings in Chapter 18
only accommodate a open-ground-for-tone function.
I've published a simple modification to the schematic
that will provide the close-ground-for-tone operation.
This same mod can be applied to any of the three
generators.
Message 9
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Carlos,
Try this site.
http://www.a-and-t-labs.com/products.htm
Peter
RV9A N60PL
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Carlos
Trigo
Sent: Sunday, June 22, 2008 8:08 AM
Subject: AeroElectric-List: Dimmer trick
Listers
I completed my instrument lights circuit, in which I have a dimmer, and all
works OK.
Nevertheless, when I tested it at night (still at my garage) I noticed that
there are a couple of instruments (e.g. the Trutrak ADI) which have a
brighter light than the others, and obviously the single dimmer, operating
all lights simultaneously, doesn't get me an optimal dimming position for
all lights at the same time.
Is there a trick to obtain similar brightness in all lights?
Can that be achieved by simply installing resistors in the brighter ones?
Carlos
Message 10
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Millivolt Power Source? |
Guys...
See: http://www.5bears.com/circuits.htm#Circuit%2001
One op amp and a couple resistors is the right way to do the job. Anything less
leaves you at the mercy of....well I shouldn't tell you...you might be scared.
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones@charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=189142#189142
Message 11
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | VOR won't show to indication. |
List,
I'm having some problems with my VOR in my cessna 150 which has the
RT328C radio. The problem is that I can't get it to show a to
indication. The from indication seems to work and is consistent with
what my GPS says so I dial 180* off and the needle kinda centers but the
indicator shows off.
So far I have pulled the radio and head and had the avionics shop test
it and it worked just fine on the bench showing to and from for the
generated vor signal, so I figured the problem was the antenna cable. I
then replaced the antenna cable with RG400 using the balun shown here:
http://www.aeroelectric.com/articles/BALUN/Balun_Fabrication.html
There isn't any connectors or breaks in the cable as it runs directly
from the radio up to the tail where the balun and antenna is. My
connections are clean so I'm certain that the cable isn't the problem.
The AWOS and identifier seem to come though ok, though there is some
radio noise.
At this point I'm not sure what else to look at. Anyone have any
suggestions?
Thanks,
schu
Message 12
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Contactor Diodes |
Bob,
I think I mis-stated question 2. What I meant to say was, "why would the
spike be stopped by the diode when it could more easily travel through the
coil wire directly to the opening switch?"
In reading your reply carefully, I believe I might be misunderstanding the
actual "flow" of energy in this instance. When you say that the diode is
positioned to conduct for any voltage that attempts to go more negative than
ground, are you saying that the spike will be conducted through the diode
(in the direction of the arrow) and back to the coil, and that this cycle
will continue until the resistance of the coil dissipates it? If so, what
makes the diode a "preferred" path over the path through the wire to the
opening switch? Is this just the nature of a diode?
I apologize if I am taking up too much of this venue's resouces in trying to
understand this concept. If this is an issue, please let me know and I will
try to gain an understanding by finding someone locally to discuss in more
detail.
Thanks,
Dave
and 2) Why would the spike be stopped by the diode when it could more easily
> travel through the coil wire directly to ground?
Don't understand this . . . since the induced voltage
caused by coil collapse is negative going at switch
when the switch opens, and the diode (a check valve for
electron flow) is positioned to conduct for any voltage
that attempts to go more negative than ground, the
spike current presented at the switch end is indeed
shunted to ground and returns to the coil through
ground. Virtually ALL the energy stored in the coil's
magnetic field is dissipated in THE RESISTANCE OF
THE COIL over tens of milliseconds.
Review the write up on Kettering ignition system
in chapter on OV relays. Kettering's points/coil/
distributor exploited this effect to generate a
multi-kilovolt spike from a 6v car battery. Here
he WANTED the spike to live long and prosper. In
our case, the same kind of spike has deleterious
effects on the contacts of the controlling switch.
Kettering used 'condenser' to mitigate deleterious
effects on points.
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|