Today's Message Index:
----------------------
1. 12:19 AM - 2010 List of Contributors (Matt Dralle)
2. 07:17 AM - Re: Computing a Resistor Value (Noel Loveys)
3. 07:37 AM - Re: Computing a Resistor Value (Ken)
4. 07:53 AM - Noise from Garmin 496 (Marty)
5. 07:57 AM - Re: Computing a Resistor Value (Noel Loveys)
6. 08:16 AM - Re: Noise from Garmin 496 (Daniel Hooper)
7. 08:56 AM - Re: Computing a Resistor Value (Noel Loveys)
8. 09:27 AM - Re: Computing a Resistor Value (Robert L. Nuckolls, III)
9. 09:43 AM - Re: Computing a Resistor Value (Robert L. Nuckolls, III)
10. 09:54 AM - Re: Computing a Resistor Value (RGent1224@aol.com)
11. 04:44 PM - Re: Computing a Resistor Value (AlRice)
12. 07:33 PM - Re: Computing a Resistor Value (Robert L. Nuckolls, III)
13. 08:48 PM - Re: Computing a Resistor Value (RGent1224@aol.com)
14. 09:41 PM - Re: Computing a Resistor Value (Bob McCallum)
Message 1
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Subject: | 2010 List of Contributors |
Dear Listers,
The 2010 Matronics Email List and Forum Fund Raiser officially ended a couple of
weeks ago and its time that I publish this year's List of Contributors. Its
the people on this list that directly make the Email Lists and Forums possible.
Their generous contributions keep the servers and Internet connection up and
running.
You can still show your support this year and pick up a great gift at the same
time. The Contribution Web Site is fast, easy, and secure:
http://www.matronics.com/contribution
Or, by dropping a personal check in the mail to:
Matt Dralle / Matronics
581 Jeannie Way
Livermore CA 94550
I also want to thank Bob, Jon, and Andy for their generous support through the
supply of great gifts this year!! These guys have some great products and I encourage
you to visit their respective web sites:
Bob Nucklolls - AeroElectric - www.aeroelectric.com
Jon Croke - HomebuiltHELP - www.homebuilthelp.com
Andy Gold - The Builder's Bookstore - www.buildersbooks.com
And finally, I'm proud to present The 2010 Fund Raiser List of Contributors:
http://www.matronics.com/loc/2010.html
Thanks again to everyone that made a Contribution this year!!
Matt Dralle
Matronics Email List and Forum Administrator
Message 2
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Subject: | Computing a Resistor Value |
First thing you want to do is build a solid state voltage regulator for a 5V
output.IK can't remember the number on the chip but they are available at
Radio Scrap.
The back of the package has a usable schematic.
Noel
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of AlRice
Sent: December 12, 2010 10:30 PM
Subject: AeroElectric-List: Computing a Resistor Value
I want to install my AV80R GPS in my panel and wire the power lead to the
bus without installing a clunky cigarette power socket on my panel. The GPS
input voltage is 5V and it draws 1.5A (at least that's what the cigarette
power lead says on it). My buss voltage is 13.5V, so how do I compute the
resistor ohm's and watts needed for my power lead? I know enough about
Ohm's law to be dangerous.
Thanks.
--------
Al Rice
Skybolt 260
RV-9A
Helping with my grandson's Piet
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=323122#323122
Message 3
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Subject: | Re: Computing a Resistor Value |
7805 and LM350 for higher current come to mind.
Ken
do not archive
Noel Loveys wrote:
>
> First thing you want to do is build a solid state voltage regulator for a 5V
> output.IK can't remember the number on the chip but they are available at
> Radio Scrap.
> The back of the package has a usable schematic.
>
> Noel
>
Message 4
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Subject: | Noise from Garmin 496 |
Thanks to Kevin K and Dave S for their replies. Seems like some
installations may have noise and others not. I'll try disconnecting the
power line next visit to the airport, but we're "frozen" in here in
Nashville TN. If that works, I suspect there is some "output" from my 496
that is generating the noise. Pulling the power input line, which also has
the power outputs will give some clues that it is in the 496 output side
versus perhaps the weather antenna.
My GPS output signal is split into three (max per Garmin) to feed my Dynon
D10A, Electronic International Fuel Totalizer, and the third device escapes
me right now, perhaps its the EI SuperClock. I also feed the output to
Garmin's SL30 radio to feed the com and nav frequencies, and the warnings to
my Garmin Audio Panel.
Waiting now for warmer weather to go do some testing! Thanks again folks
for your thoughts.
Marty N826ME RV-6A
Message 5
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Subject: | Computing a Resistor Value |
Only problem with that is resistors don't drop voltage unless they are set
up in a voltage divider network. They only restrict current.
Don't believe me? Ok.... Try this; take a convenient battery and measure
the voltage across the terminals. Then connect any resistor to one terminal
of the voltmeter and take another reading. Guess what both readings will be
the same!
Now to check the current flow. Connect a nice hefty resistor to one
terminal of the battery and using a suitable ammeter measure the current
through the resistor. Then add a resistor to one terminal of the ammeter and
read again.... The second reading will be less than the first one
indicating the resistor has actually dropped the current. If you are unsure
of the resistor sizes to try use a battery tester and a resistor to do this
experiment.
If you want to build a voltage divider network with two resistors then that
is another ball of wax. The problem with that is the network loads your
buss the whole time it is active and it will load your buss. A solid state
voltage regulator on the other hand will also load your buss but to a much
less degree.
Early model 45 field radios used a voltage divider network to give low power
capability to the transmitters. It wasn't long before operators noticed the
batteries didn't last jig time if the transmitter was operated on low power
mode.
Noel
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Richard
E. Tasker
Sent: December 13, 2010 1:11 AM
Subject: Re: AeroElectric-List: Computing a Resistor Value
<retasker@optonline.net>
Just adding a resistor is probably not a good idea. A resistor drops a
variable amount of voltage depending on the actual current consumption.
Additionally, your bus voltage will vary from 12V or less when the
alternator is off to as much as 14.2V when it is on. Unless the AV80R
draws a constant current (unlikely) and can handle a relatively wide
voltage input, you really do need to use the power cord or some other
source of 5V.
I couldn't find a manual to see what voltage it can handle, but given
they sell adapters for 12/24VDC and for 110/220VAC, it is likely that it
can use only a limited voltage (5V).
The markings on the adapter almost surely refer to the adapter capacity,
not the exact consumption of the AV80R.
For educational purposes, assuming that the AV80R actually did take
exactly 1.5A at 5V and your buss voltage was a constant 13.5V, you would
calculate the resistor value as follows:
The resistor would have to drop 13.5V minus 5V or 8.5V at 1.5A. Since
V=I*R or R=V/I, then R = 8.5V/1.5A or 5.666 ohms which is close to a
standard 5.6 ohm resistor. If we used that resistor we would actually
get 8.4V drop which gives us 5.1V for the AV80R which would probably be
close enough. The power dissipated in the resistor would be P=V*I or
8.4V*1.5A = 12.6W which would mean it would have to be a pretty large
wirewound ceramic resistor that would get mighty hot. Of course, all
this is based on the paragraph above this one, which is highly unlikely.
You can either find a 12V to 5V power converter to include behind the
panel or just use the optional cigarette lighter adapter provided by
Honeywell.
Dick Tasker
AlRice wrote:
> --> AeroElectric-List message posted by: "AlRice"<Allen@AllenRice.net>
>
> I want to install my AV80R GPS in my panel and wire the power lead to the
bus without installing a clunky cigarette power socket on my panel. The GPS
input voltage is 5V and it draws 1.5A (at least that's what the cigarette
power lead says on it). My buss voltage is 13.5V, so how do I compute the
resistor ohm's and watts needed for my power lead? I know enough about
Ohm's law to be dangerous.
> Thanks.
>
> --------
> Al Rice
> Skybolt 260
> RV-9A
> Helping with my grandson's Piet
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=323122#323122
>
>
>
--
Please Note:
No trees were destroyed in the sending of this message. We do concede,
however,
that a significant number of electrons may have been temporarily
inconvenienced.
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Message 6
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Subject: | Re: Noise from Garmin 496 |
Easier than disconnecting the power line, does it make the noise after
it is fully charged? Some consumer devices with Li+ batteries have a
habit of hammering the power line with noise while charging.
It sounds like you have a lot of possible ground paths for the Garmin.
Any of these can cause the charging return current to take an
unwanted, roundabout path back to the battery. Additionally, if your
audio output is single-ended (Audio+ to signal, Audio- to ground)
large (by comparison) power currents can cause the unit to 'float' a
bit from ground potential. When the power current varies, the 'floats'
are cyclical, and you could hear it as noise.
Hope that helps!
--Daniel
On Tue, Dec 14, 2010 at 9:50 AM, Marty <rv6awingman@gmail.com> wrote:
> Thanks to Kevin K and Dave S for their replies. Seems like some
> installations may have noise and others not. I'll try disconnecting the
> power line next visit to the airport, but we're "frozen" in here in
> Nashville TN. If that works, I suspect there is some "output" from my 496
> that is generating the noise. Pulling the power input line, which also has
> the power outputs will give some clues that it is in the 496 output side
> versus perhaps the weather antenna.
> My GPS output signal is split into three (max per Garmin) to feed my Dynon
> D10A, Electronic International Fuel Totalizer, and the third device escapes
> me right now, perhaps its the EI SuperClock. I also feed the output to
> Garmin's SL30 radio to feed the com and nav frequencies, and the warnings to
> my Garmin Audio Panel.
> Waiting now for warmer weather to go do some testing! Thanks again folks
> for your thoughts.
> Marty N826MERV-6A
>
>
--
Daniel Hooper
Message 7
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Subject: | Computing a Resistor Value |
Yes... but another answer would be to us a circuit with more current
capability. Or possibly using the 7805 to switch a power transistor.
Noel
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Mike
Welch
Sent: December 13, 2010 10:39 AM
Subject: RE: AeroElectric-List: Computing a Resistor Value
> The GPS input voltage is 5V and it draws 1.5A (at least that's what the
>cigarette power lead says on it). My buss voltage is 13.5V, so how do I
compute
>the resistor ohm's and watts needed for my power lead?I know enough about
>Ohm's law to be dangerous.
> Thanks.
> --------
> Al Rice
Mornin' Al,
When I first read your post, I didn't think the resistor was the way to
go, either,
same as Dick Tasker described. My thinking was you're asking quite a bit
from just one
resistor.
My initial thought was "why not build a 5 volt circuit" (like this one)?
http://www.tkk.fi/Misc/Electronics/circuits/psu_5v.html
Recently, I asked this forum if they knew how I could turn my Ray Allen
servo resistance
output (0-5K ohms) into a visual LED indicator. Our buddy Joe Gores offered
the perfect suggestion
of a circuit referenced from Mike Linse.
Included in his suggestion was that really handy 5 volt circuit above,
plus it is super easy to build.
The circuit had a final voltage output of 4.96 volts, and when combined with
the circuit Mike Linse
talked about, the whole project worked exactly as I was hoping for.
From the article's data points about this 5 volt circuit, it says it may
be limited to only
one amp, plus you should consider a heat sink. So I got to
thinking.........
Here's a question for for you guys that rearrange electrons for a
living.....could a guy
build TWO of these 5 volt circuits, and combine the '5 volt output' in
parallel?
Mike Welch
Message 8
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Subject: | Computing a Resistor Value |
At 09:12 AM 12/14/2010, you wrote:
>
>First thing you want to do is build a solid state voltage regulator for a 5V
>output.IK can't remember the number on the chip but they are available at
>Radio Scrap.
>The back of the package has a usable schematic.
This is also an option. The 3-terminal regulators
are factory calibrated step-down voltage control
devices.
http://www.fairchildsemi.com/ds/LM/LM7805.pdf
Unlike the "smart weight" I described earlier,
these are more like "smart valves". Instead of
working in PARALLEL with the output load, these
work in SERIES. They have a distinct advantage
for optimizing power dissipation (waste heat).
As we studied in the Zener example, loads on the
input power supply are constant irrespective of
load demanded by the powered-up device. This is
the least efficient means by which step down
voltage tasks can be managed but they are
SIMPLE. So you use them only in the smallest
of situations were waste energy is not a significant
design concern.
The series-pass 3-terminal regulators will draw
power from the supply that is only a few microamps
more than the load demanded by the load. They
are also easily adjusted. I used to offer a line
of panel light dimmers based on 3-terminal devices.
http://www.aeroelectric.com/Catalog/AEC/9013/
Note that the larger the anticipated loads,
the larger the device AND it's associated
heatsink. Now, if you don't mind taking the
hit in terms of size, weight and disspated
power, this technology offers a simple, low
noise and relatively inexpensive means for
acquiring a very high-quality (meaning low
noise) DC power source for devices needing
9 volts and less.
This 9-volt limitation is due to the need
for 'headroom' in the difference between
input and output voltages. If you want
the device to deliver, say 12 volts constant
output, the INPUT cannot be lower than about
13.5 volts. A 9v design goal for output
can be achieved for inputs down to about
10.5 volts.
Bob . . .
>Noel
>
>-----Original Message-----
>From: owner-aeroelectric-list-server@matronics.com
>[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of AlRice
>Sent: December 12, 2010 10:30 PM
>To: aeroelectric-list@matronics.com
>Subject: AeroElectric-List: Computing a Resistor Value
>
>
>I want to install my AV80R GPS in my panel and wire the power lead to the
>bus without installing a clunky cigarette power socket on my panel. The GPS
>input voltage is 5V and it draws 1.5A (at least that's what the cigarette
>power lead says on it). My buss voltage is 13.5V, so how do I compute the
>resistor ohm's and watts needed for my power lead? I know enough about
>Ohm's law to be dangerous.
>Thanks.
>
>--------
>Al Rice
>Skybolt 260
>RV-9A
>Helping with my grandson's Piet
>
>
>Read this topic online here:
>
>http://forums.matronics.com/viewtopic.php?p=323122#323122
>
>
>-----
>No virus found in this message.
>Checked by AVG - www.avg.com
Bob . . .
Message 9
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Subject: | Computing a Resistor Value |
Mornin' Al,
When I first read your post, I didn't think the resistor was the way
to go, either,
same as Dick Tasker described. My thinking was you're asking quite a
bit from just one
resistor.
My initial thought was "why not build a 5 volt circuit" (like this one)?
http://www.tkk.fi/Misc/Electronics/circuits/psu_5v.html
Recently, I asked this forum if they knew how I could turn my Ray
Allen servo resistance
output (0-5K ohms) into a visual LED indicator. Our buddy Joe Gores
offered the perfect suggestion
of a circuit referenced from Mike Linse.
Included in his suggestion was that really handy 5 volt circuit
above, plus it is super easy to build.
The circuit had a final voltage output of 4.96 volts, and when
combined with the circuit Mike Linse
talked about, the whole project worked exactly as I was hoping for.
From the article's data points about this 5 volt circuit, it says it
may be limited to only
one amp, plus you should consider a heat sink. So I got to thinking.........
Here's a question for for you guys that rearrange electrons for a
living.....could a guy
build TWO of these 5 volt circuits, and combine the '5 volt output'
in parallel?
Sure . . . or go to a bigger device. The 3-terminal regulators come
in a range of sizes. The smallest are
Emacs!
6 x 4 mm on a side, solder right to the board, and as you
might expect, cannot dissipate much power. They're good
for 100-500 mA max . . . but if your needs are small . . .
At the other end of the spectrum, you can buy these guys
Emacs!
Rated for 5A and MUST be on a hefty heatsink. Furhter,
one can built arrays of transistors on even heftier
heatsinks perhaps cooled with fans.
Emacs!
I think the last time I built up something like this
it was to craft a finely adjustable 50A, 28v load bank.
There were 10 fat transistors on a big chunk of aluminum
cooled with a fan. This rig was good for 1400 watts
of room warming dissipation all controlled by a little
piece of plastic
Emacs!
and a 1/2" diameter potentiometer.
The point to be made here is that the series-pass,
smart regulator can be crafted in just about any size
and output voltage within ratings limits for the
devices.
Bob . . .
Message 10
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Subject: | Re: Computing a Resistor Value |
Bob
Did you include a bunch of photos that Yahoo didn't like??
Just a wondering
Dick
In a message dated 12/14/2010 11:44:25 A.M. Central Standard Time,
nuckolls.bob@aeroelectric.com writes:
Mornin' Al,
When I first read your post, I didn't think the resistor was the way to
go, either,
same as Dick Tasker described. My thinking was you're asking quite a bit
from just one
resistor.
My initial thought was "why not build a 5 volt circuit" (like this one)?
_http://www.tkk.fi/Misc/Electronics/circuits/psu_5v.html
_ (http://www.tkk.fi/Misc/Electronics/circuits/psu_5v.html)
Recently, I asked this forum if they knew how I could turn my Ray Allen
servo resistance
output (0-5K ohms) into a visual LED indicator. Our buddy Joe Gores
offered the perfect suggestion
of a circuit referenced from Mike Linse.
Included in his suggestion was that really handy 5 volt circuit above,
plus it is super easy to build.
The circuit had a final voltage output of 4.96 volts, and when combined
with the circuit Mike Linse
talked about, the whole project worked exactly as I was hoping for.
>From the article's data points about this 5 volt circuit, it says it may
be limited to only
one amp, plus you should consider a heat sink. So I got to
thinking.........
Here's a question for for you guys that rearrange electrons for a
living.....could a guy
build TWO of these 5 volt circuits, and combine the '5 volt output' in
parallel?
Sure . . . or go to a bigger device. The 3-terminal regulators come
in a range of sizes. The smallest are
6 x 4 mm on a side, solder right to the board, and as you
might expect, cannot dissipate much power. They're good
for 100-500 mA max . . . but if your needs are small . . .
At the other end of the spectrum, you can buy these guys
Rated for 5A and MUST be on a hefty heatsink. Furhter,
one can built arrays of transistors on even heftier
heatsinks perhaps cooled with fans.
I think the last time I built up something like this
it was to craft a finely adjustable 50A, 28v load bank.
There were 10 fat transistors on a big chunk of aluminum
cooled with a fan. This rig was good for 1400 watts
of room warming dissipation all controlled by a little
piece of plastic
and a 1/2" diameter potentiometer.
The point to be made here is that the series-pass,
smart regulator can be crafted in just about any size
and output voltage within ratings limits for the
devices.
Bob . . .
Message 11
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Subject: | Re: Computing a Resistor Value |
So, like I said, I chickened out and decided to use the car charger unit that came
with the AV80R. I was able to pry the case apart and inside was a 1"x1" 12v-5v
DC to DC power converter. I cut off the leads to the outside contacts and
soldered on longer leads. For a case for the power converter, I simply used
the existing one and routed the leads out the nose to a Molex plug. I'll secure
the case behind the panel with an Adel clamp. Here is what it looks like.
--------
Al Rice
Skybolt 260
RV-9A
Helping with my grandson's Piet
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=323386#323386
Attachments:
http://forums.matronics.com//files/img_0001_533.jpg
Message 12
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Subject: | Re: Computing a Resistor Value |
At 11:50 AM 12/14/2010, you wrote:
>Bob
>Did you include a bunch of photos that Yahoo didn't like??
>Just a wondering
>Dick
>
I guess I don't understand the question. Are you
having trouble seeing the images? You echoed the
posting back to me and they all appear as I originally
sent them.
Bob . . .
Message 13
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Subject: | Re: Computing a Resistor Value |
All I got was blanks where a photo was supposed to be aka Blanks
Dick
In a message dated 12/14/2010 9:35:34 P.M. Central Standard Time,
nuckolls.bob@aeroelectric.com writes:
At 11:50 AM 12/14/2010, you wrote:
Bob
Did you include a bunch of photos that Yahoo didn't like??
Just a wondering
Dick
I guess I don't understand the question. Are you
having trouble seeing the images? You echoed the
posting back to me and they all appear as I originally
sent them.
Bob . . .
(http://www.aeroelectric.com/)
(http://www.buildersbooks.com/)
(http://www.homebuilthelp.com/)
(http://www.matronics.com/contribution)
(http://www.matronics.com/Navigator?AeroElectric-List)
Message 14
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Subject: | Computing a Resistor Value |
Dick;
All of the pictures in both Bob's original and your reply to him worked fine
for me. No blanks. Must have something to do with your computer settings.
Bob McC
DO NOT ARCHIVE
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
RGent1224@aol.com
Sent: Tuesday, December 14, 2010 11:44 PM
Subject: Re: AeroElectric-List: Computing a Resistor Value
All I got was blanks where a photo was supposed to be aka Blanks
Dick
In a message dated 12/14/2010 9:35:34 P.M. Central Standard Time,
nuckolls.bob@aeroelectric.com writes:
At 11:50 AM 12/14/2010, you wrote:
Bob
Did you include a bunch of photos that Yahoo didn't like??
Just a wondering
Dick
I guess I don't understand the question. Are you
having trouble seeing the images? You echoed the
posting back to me and they all appear as I originally
sent them.
Bob . . .
tp://www.aeroelectric.com/">www.aeroelectric.com
/ href="http://www.buildersbooks.com/">www.buildersbooks.com
http://www.homebuilthelp.com/">www.homebuilthelp.com
p://www.matronics.com/contribution">http://www.matronics.com/contribution
ist
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matro
nics.com/Navigator?AeroElectric-List
s.matronics.com/">http://forums.matronics.com
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