Today's Message Index:
----------------------
1. 05:52 AM - Re: Ebus Diode (Eric M. Jones)
2. 06:15 AM - Re: LED heatsink material? (Eric M. Jones)
3. 06:59 AM - Re: Re: Ebus Diode (Robert L. Nuckolls, III)
4. 11:32 AM - Re: Re: Ebus Diode (Roger & Jean)
5. 12:29 PM - Re: LED strip lighting for panels (Ed Holyoke)
6. 01:15 PM - Re: LED strip lighting for panels (wynaire@citlink.net)
7. 02:28 PM - Re: LED strip lighting for panels (Holger Selover-Stephan)
8. 02:28 PM - Re: LED strip lighting for panels (Andy Crabtree)
Message 1
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I've been selling these for a decade. My newest version can be used as two parallel,
a Y-configuration or just a big diode. Heatsink included. See attached.
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=397835#397835
Attachments:
http://forums.matronics.com//files/power_deuce_schottky_manual_200.pdf
Message 2
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| Subject: | Re: LED heatsink material? |
> Seems like quite a lot of aluminium, and plenty of surface area, but it would
nice to find a way of evaluating its effectiveness... other than waiting for
the smell of burning semiconductor...
Tape this into your toolbox. These are for surfaces touched with a non-calloused
finger, not ambients.
Cool: 100 degC
You can estimate between these numbers quite well.
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=397842#397842
Message 3
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| Subject: | Re: RE: Ebus Diode |
At 08:25 PM 4/3/2013, you wrote:
><dean.psiropoulos@verizon.net>
>
>If you want true redundancy then just use two rectifiers in parallel.
Actually, if you want redundancy for a failed
diode, you would want to wire them in series.
Diodes generally fail shorted. So having a good
diode in parallel would a bad one would not
mitigate the failure. But of course, diodes in
series doubles the voltage drop and that's not
high on our list of design goals.
As long as they're adequately heat-sinked,
the diode will outlast the airplane. If
not heat adequately sinked, life expectancy
is short.
The first 'crowbar' ov protection system to
go into a TC aircraft can be found on the AA-1
Yankee. Alternator field was supplied through
a 3 or 5 amp glass cartridge fuse. I don't
recall which right now. Downstream of the fuse
they wired a 15 volt, 1-watt, glass zener to
ground.
In an ov condition, the zener was driven into
destructive conduction, it's junction melted
and shorted the field supply downstream of the
fuse. Crude but it did work . . . with limitations.
I ran some tests on this configuration
at Electro-Mech after an OEM engineer asked me
about it . . . I think it was a guy at Mooney.
Sure 'nuf. Fault the regulator, bus votlage jumps,
zener discolors and turns black, fuse pops, event
over. MUCH slower than legacy OV protection systems
that operate in tens of milliseconds . . . but
certainly better than no OV protection.
I heard of variations on the theme that proved
unsatisfactory . . . like replacing the fast-fuse
with a slow-blow. Or replacing the zener with
its plastic cousin. Plastic zeners and diodes
like to blow apart when fused.
There was an alternator supplier at OSH one year
who advertised "built in OV protection".
Some guy came by the B&C booth to tell me about
it . . . he was skeptical. I walked over to see
what was being offered. Without introducing myself
I asked the vendor to tell me all about it. It
pointed to a plastic, 1-w zener wired across the
alternator's B-terminal to ground. I took some
literature and thanked him for the info.
Some time later, somebody on the Compuserve
AVSIG forum was asking about this same product.
He said his alternator went bad and his OV
protection 'disappeared' without having done
it's job. Upon further inquiry, he said the
little wires were still there . . . just the
black plastic part was gone.
This was an internally regulated alternator
and could not be easily fitted with OV protection.
Certainly the little glob of plastic was not
up to the task.
Bob . . .
Message 4
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> I've been selling these for a decade. My newest version can be used as two
> parallel, a Y-configuration or just a big diode. Heatsink included. See
> attached.
>
> --------
> Eric M. Jones
Eric,
In looking at your attached diagram, it is my assumption that you are using
the diodes to supply power to critical for flight devices. My thought is
that you would be much better off using 2 fuel pumps and 2 ECU's each
running through their own switches to separate batteries and eliminate the
diodes. This is a little more costly but my thinking is that it will
increase your safety factor by an order of magnitude. Am I wrong on this
approach?
Roger
Message 5
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| Subject: | Re: LED strip lighting for panels |
Bob,
Is the DIM5-14 the same item as in your drawing and can be modified for
dimming the led strip lights by replacing resistors as you suggest?
Ed Holyoke
On 4/2/2013 12:12 PM, Robert L. Nuckolls, III wrote:
> If your airplane has a glare shield, you can
> consider the used of LED strip lights similar
> to these.
>
> http://tinyurl.com/c3wozbj
>
> These strips are assembled from an array
> of LED trios in series fitted with the appropriate
> series resistor to provide max illumination with
> 12vdc applied. Each trio occupies about 2" of
> length.
>
> Three white lights in series do not begin to
> output until applied voltage rises to 7.5 volts
> or so. At 12 volts, each group of 3 lamps
> (about 2" in length) draws about 25 milliamps.
>
> Assume you need 36" of strip to stretch
> across the glare shield (18 trios). You'll
> need a dimmer control capable of carrying
> 18 x .025 or 0.45 amps. This relatively
> low current draw makes the noise-free, linear
> regulators more attractive. Referring to this
> drawing
>
> http://tinyurl.com/ccrpzfa
>
> You see the architecture for a dimmer set up for
> incandescent lamps. I.e. 4.5 volts minimum. For service
> with these strips, the minimum needs to be raised to
> 7.5 volts. Further, we want to fix the adjustment
> range at 7.5 - 12v or a delta-V of 3.5 volts.
>
> Since our stock "pot" is 2.5K, then to get 3.5
> volts dropped across the pot at max resistance,
> we need a divider current of 3.5/2500 or 1.4 milliamps.
>
> The voltage across the upper resistor is fixed at
> 1.25 volts by internal characteristics of the
> 317 regulator. 1.25V/0.0014A = 892 (910 ohms
> is close enough and a standard 5% value).
>
> Okay, with the pot at min resistance, we need
> 7.5 volts total output. (7.5 - 1.25)/0.0014
> equals 4464 ohms (4700 is also a standard
> value and sufficiently close).
>
> So, if you'd care to build your own dimmer the
> 390 ohm resistor is replaced with a 910 ohm
> resistor; the 910 ohm resistor is replaced with
> a 4700 ohm resistor. The TO220 plastic package
> version of the LM317 on a modicum of heatsink
> would be 'fat' enough and entirely free of noise.
>
> That 15-foot chunk of strip lighting for $20 is
> delivered toyour door at that price and is probably
> enough lighting to do 5 airplanes. I've copied B&C
> on this posting to see if they'd be interested in
> offering an LED strip light version of their DIM5-14
> product.
>
> http://tinyurl.com/dylkufj
>
> Bob . . .
>
> *
>
>
> *
Message 6
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| Subject: | Re: LED strip lighting for panels |
FWIW: There are Ebay sites {China} now offering inexpensive LED dimmers, fo
r stirp lighting.-One is one it's way here. If it smokes, I-will post t
he peticulars. As always, thanks for your advice.-=0AMike W.=0APS: Now lo
oking for an "inexpensive" CS prop governor for a Lyc IO-360 AV. Anyone bui
lding one in his -shop? ;))=0A***********=0A=0AFrom: Ed Holyoke <bicyclop
@pacbell.net>=0A>To: aeroelectric-list@matronics.com =0A>Sent: Thursday, Ap
ril 4, 2013 1:29 PM=0A>Subject: Re: AeroElectric-List: LED strip lighting f
or panels=0A>=0A>=0A>Bob,=0A>=0A>Is the DIM5-14 the same item as in your dr
awing and can be modified for dimming the led strip lights by replacing res
istors as you suggest?=0A>=0A>Ed Holyoke=0A>=0A>On 4/2/2013 12:12 PM, Rober
t L. Nuckolls, III wrote: =0A>If your airplane has a glare shield, you can
=0A>>consider the used of LED strip lights similar=0A>>to these.=0A>>=0A>>h
ttp://tinyurl.com/c3wozbj=0A>>=0A>>These strips are assembled from an array
=0A>>of LED trios in series fitted with the appropriate=0A>>series resistor
to provide max illumination with=0A>>12vdc applied. Each trio occupies abo
ut 2" of=0A>>length.=0A>>=0A>>Three white lights in series do not begin to
=0A>>output until applied voltage rises to 7.5 volts=0A>>or so.- At 12 vo
lts, each group of 3 lamps=0A>>(about 2" in length) draws about 25 milliamp
s.=0A>>=0A>>Assume you need 36" of strip to stretch=0A>>across the glare sh
ield (18 trios). You'll=0A>>need a dimmer control capable of carrying=0A>>1
8 x .025 or 0.45 amps. This relatively=0A>>low current draw makes the noise
-free, linear=0A>>regulators more attractive. Referring to this=0A>>drawing
=0A>>=0A>>http://tinyurl.com/ccrpzfa=0A>>=0A>>You see the architecture for
a dimmer set up for=0A>>incandescent lamps. I.e. 4.5 volts minimum. For ser
vice=0A>>with these strips, the minimum needs to be raised to=0A>>7.5 volts
. Further, we want to fix the adjustment=0A>>range at 7.5 - 12v or a delta-
V of 3.5 volts.=0A>>=0A>>Since our stock "pot" is 2.5K, then to get 3.5=0A>
>volts dropped across the pot at max resistance,=0A>>we need a divider curr
ent of 3.5/2500 or 1.4 milliamps.=0A>>=0A>>The voltage across the upper res
istor is fixed at=0A>>1.25 volts by internal characteristics of the=0A>>317
regulator. 1.25V/0.0014A = 892 (910 ohms=0A>>is close enough and a stand
ard 5% value).=0A>>=0A>>Okay, with the pot at min resistance, we need=0A>>7
.5 volts total output. (7.5 - 1.25)/0.0014=0A>>equals 4464 ohms (4700 is al
so a standard=0A>>value and sufficiently close).=0A>>=0A>>So, if you'd care
to build your own dimmer the=0A>>390 ohm resistor is replaced with a 910 o
hm=0A>>resistor; the 910 ohm resistor is replaced with=0A>>a 4700 ohm resis
tor. The TO220 plastic package=0A>>version of the LM317 on a modicum of hea
tsink=0A>>would be 'fat' enough and entirely free of noise.=0A>>=0A>>That 1
5-foot chunk of strip lighting for $20 is=0A>>delivered toyour door at that
price and is probably=0A>>enough lighting to do 5 airplanes. I've copied B
&C=0A>>on this posting to see if they'd be interested in=0A>>offering an LE
D strip light version of their DIM5-14=0A>>product.=0A>>=0A>>http://tinyurl
========= =0A>=0A>
Message 7
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| Subject: | Re: LED strip lighting for panels |
I have two of those $6 dimmers on order also. Others have already
reported success using them in the RV forum.
Holger
On Apr 4, 2013, at 10:14 PM, wynaire@citlink.net wrote:
> FWIW: There are Ebay sites {China} now offering inexpensive LED
dimmers, for stirp lighting. One is one it's way here. If it smokes, I
will post the peticulars. As always, thanks for your advice.
> Mike W.
> PS: Now looking for an "inexpensive" CS prop governor for a Lyc IO-360
AV. Anyone building one in his shop? ;))
> ***********
Message 8
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| Subject: | Re: LED strip lighting for panels |
This is what was recommended by other builders, Kick KR6 $15-$20 on ebay. I
haven't "fired" it up yet....=0Ahttp://www.kicklighting.com/Kick-Lighting-
KR6.pdf=0A=0A=0A________________________________=0AFrom: "wynaire@citlink.n
et" <wynaire@citlink.net>=0ATo: "aeroelectric-list@matronics.com" <aeroelec
tric-list@matronics.com> =0ASent: Thursday, April 4, 2013 3:14 PM=0ASubject
: Re: AeroElectric-List: LED strip lighting for panels=0A=0A=0AFWIW: There
are Ebay sites {China} now offering inexpensive LED dimmers, for stirp ligh
ting.-One is one it's way here. If it smokes, I-will post the peticular
s. As always, thanks for your advice.-=0AMike W.=0APS: Now looking for an
"inexpensive" CS prop governor for a Lyc IO-360 AV. Anyone building one in
his -shop? ;))=0A***********=0A=0A=0A=0A>_______________________________
_=0A>From: Ed Holyoke <bicyclop@pacbell.net>=0A>To: aeroelectric-list@matro
nics.com =0A>Sent: Thursday, April 4, 2013 1:29 PM=0A>Subject: Re: AeroElec
tric-List: LED strip lighting for panels=0A>=0A>=0A>Bob,=0A>=0A>Is the DIM5
-14 the same item as in your drawing and can be modified for dimming the le
d strip lights by replacing resistors as you suggest?=0A>=0A>Ed Holyoke=0A>
=0A>On 4/2/2013 12:12 PM, Robert L. Nuckolls, III wrote: =0A>If your airpla
ne has a glare shield, you can=0A>>consider the used of LED strip lights si
milar=0A>>to these.=0A>>=0A>>http://tinyurl.com/c3wozbj=0A>>=0A>>These stri
ps are assembled from an array=0A>>of LED trios in series fitted with the a
ppropriate=0A>>series resistor to provide max illumination with=0A>>12vdc a
pplied. Each trio occupies about 2" of=0A>>length.=0A>>=0A>>Three white lig
hts in series do not begin to=0A>>output until applied voltage rises to 7.5
volts=0A>>or so.- At 12 volts, each group of 3 lamps=0A>>(about 2" in le
ngth) draws about 25 milliamps.=0A>>=0A>>Assume you need 36" of strip to st
retch=0A>>across the glare shield (18 trios). You'll=0A>>need a dimmer cont
rol capable of carrying=0A>>18 x .025 or 0.45 amps. This relatively=0A>>low
current draw makes the noise-free, linear=0A>>regulators more attractive.
Referring to this=0A>>drawing=0A>>=0A>>http://tinyurl.com/ccrpzfa=0A>>=0A>>
You see the architecture for a dimmer set up for=0A>>incandescent lamps. I.
e. 4.5 volts minimum. For service=0A>>with these strips, the minimum needs
to be raised to=0A>>7.5 volts. Further, we want to fix the adjustment=0A>>r
ange at 7.5 - 12v or a delta-V of 3.5 volts.=0A>>=0A>>Since our stock "pot"
is 2.5K, then to get 3.5=0A>>volts dropped across the pot at max resistanc
e,=0A>>we need a divider current of 3.5/2500 or 1.4 milliamps.=0A>>=0A>>The
voltage across the upper resistor is fixed at=0A>>1.25 volts by internal c
haracteristics of the=0A>>317 regulator. 1.25V/0.0014A = 892 (910 ohms=0A
>>is close enough and a standard 5% value).=0A>>=0A>>Okay, with the pot at
min resistance, we need=0A>>7.5 volts total output. (7.5 - 1.25)/0.0014=0A>
>equals 4464 ohms (4700 is also a standard=0A>>value and sufficiently close
).=0A>>=0A>>So, if you'd care to build your own dimmer the=0A>>390 ohm resi
stor is replaced with a 910 ohm=0A>>resistor; the 910 ohm resistor is repla
ced with=0A>>a 4700 ohm resistor. The TO220 plastic package=0A>>version of
the LM317 on a modicum of heatsink=0A>>would be 'fat' enough and entirely f
ree of noise.=0A>>=0A>>That 15-foot chunk of strip lighting for $20 is=0A>>
delivered toyour door at that price and is probably=0A>>enough lighting to
do 5 airplanes. I've copied B&C=0A>>on this posting to see if they'd be int
erested in=0A>>offering an LED strip light version of their DIM5-14=0A>>pro
duct.=0A>>=0A>>http://tinyurl.com/dylkufj=0A>>=0A>>=0A>>- Bob . . . =0A>
=====================
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