Today's Message Index:
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1. 03:58 AM - Re: power supply for testing (A R Goldman)
2. 04:46 AM - Re: power supply for testing (user9253)
3. 09:24 AM - Re: Alternator with no battery? (D L Josephson)
4. 03:53 PM - Re: Lighted Toggle Switch recommendation (haribole)
5. 04:19 PM - Re: Re: power supply for testing (ARGOLDMAN@aol.com)
Message 1
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Subject: | Re: power supply for testing |
What about a power supply from an old computer?
Thanks
Rich
Sent from my iPhone
> On Jun 4, 2015, at 1:41 PM, "Robert L. Nuckolls, III" <nuckolls.bob@aeroel
ectric.com> wrote:
>
> At 10:09 AM 6/4/2015, you wrote:
>> Would this item be an acceptable choice for testing my electrical system?
Could it be used without any battery in the system? My avionics etc. are al
l Dynon.
>>
>> http://www.amazon.com/Universal-Regulated-Switching-Computer-Project/dp/B
00D7CWSCG/ref=sr_1_5?ie=UTF8&qid=1433430384&sr=8-5&keywords=12+vol
t+DC+power+supply&pebp=1433430415435&perid=1MV8XVM71ACD3B1WWBYZ
>>
>> Thanks,
>>
>> Ken
>
>
> Yes
>
>
> Bob . . .
>
>
>
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Message 2
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Subject: | Re: power supply for testing |
> What about a power supply from an old computer?
> Thanks
> Rich
A computer power supply could be used, but be careful with polarity. A computer
power supply has both positive and negative outputs. The negative output has
a much smaller output rating, so use the positive output. A computer power
supply voltage is only 12 volts, whereas an aircraft usually operates between
13 and 14 volts. But that should not matter for most equipment.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=443127#443127
Message 3
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Subject: | Re: Alternator with no battery? |
On 6/6/15 12:00 AM, AeroElectric-List Digest Server wrote:
> Time: 01:53:19 PM PST US
> Subject: AeroElectric-List: Re: Alternator with no battery?
> From: "donjohnston" <don@velocity-xl.com>
>
>
> This is very interesting. Thanks to everyone for participating.
>
> So is it safe to say that the battery is providing a type of surge suppression
> (or power leveling or fluctuation dampening) function in this circuit?
Yes.
>
> And if it's correct that the absence of the battery could cause an over voltage
> situation, is there a way to mitigate that? Or is that scenario so unlikely that
> it's not worth protecting against?
>
There is a way to mitigate that, if you want. An overvoltage protection
circuit can take a runaway alternator/regulator offline in the case of
an open battery. This is probably a less likely possibility at least for
lead-acid batteries than the possibility of the OVP taking the
alternator offline at inconvenient times for other reasons. Systems
engineering is based on understanding and weighing all of the
foreseeable consequences -- more protection does not necessarily equate
to fewer failure experiences. As Bob has explained in the past, modern
aircraft loads are much more tolerant of overvoltage conditions than was
the case years ago.
Having had such an experience in my Mooney when the regulator ground
wire came loose, I can report that it was preferable to manually shed
loads known to be voltage-sensitive (no DME for you today!), add
additional loads like pitot heat and landing lights to bring the voltage
down. You can manage the situation, rather than pop the alternator
offline (particularly automatically, with no possibility for reset) and
trust the battery to supply the energy for the remainder of the flight.
David Josephson
Message 4
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Subject: | Re: Lighted Toggle Switch recommendation |
Digikey part number 432-1283-ND for the Carlington LT series seems like a good
fit for 15A and under.
http://tinyurl.com/q9o57pu
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=443150#443150
Message 5
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Subject: | Re: power supply for testing |
Thanks Joe
Rich
In a message dated 6/6/2015 11:10:47 A.M. Central Daylight Time,
fransew@gmail.com writes:
--> AeroElectric-List message posted by: "user9253" <fransew@gmail.com>
> What about a power supply from an old computer?
> Thanks
> Rich
A computer power supply could be used, but be careful with polarity. A
computer power supply has both positive and negative outputs. The negative
output has a much smaller output rating, so use the positive output. A
computer power supply voltage is only 12 volts, whereas an aircraft usually
operates between 13 and 14 volts. But that should not matter for most equip
ment.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=443127#443127
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