Today's Message Index:
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1. 12:57 PM - Re: Re: B&C voltage regulator low voltage warning (ADDENDUM) (Robert L. Nuckolls, III)
2. 01:04 PM - Re: Re: B&C voltage regulator low voltage warning (ADDENDUM) (Robert L. Nuckolls, III)
3. 05:11 PM - Re: SL-15 Audio Output (William Hunter)
4. 08:58 PM - Interesting King Air Complete Electrical Failure (Sebastien)
Message 1
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| Subject: | Re: B&C voltage regulator low voltage warning |
(ADDENDUM)
At 11:18 PM 12/30/2019, you wrote:
>Deems reports that B&C is recommending a 470 ohm
>resistor=C2 between terminals 3 and 5, but the drawing
><http://aeroelectric.com/Pictures/Schematics/LR3_LV_Led_1.jpg>http://aeroel
ectric.com/Pictures/Schematics/LR3_LV_Led_1.jpg
>seems to me to show a resistance of more like
>940 ohms between the two terminals, ignoring the
>parallel resistance of the diode.=C2
>Will either arrangement work?
I think the image above shows TWO resistors, one
across the lamp, a second in series with the lamp.
This configuration is used when you supply your
own, rudimentary LED (a 4 volt device).
If your proposed LED annunciator already features
a built in series resistor (12v device) then
you use ONE resistor between 3 and 5 on regulator.
Bob . . .
Message 2
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| Subject: | Re: B&C voltage regulator low voltage warning |
(ADDENDUM)
At 11:18 PM 12/30/2019, you wrote:
>Deems reports that B&C is recommending a 470 ohm
>resistor=C2 between terminals 3 and 5, but the drawing
><http://aeroelectric.com/Pictures/Schematics/LR3_LV_Led_1.jpg>http://aeroel
ectric.com/Pictures/Schematics/LR3_LV_Led_1.jpg
>seems to me to show a resistance of more like
>940 ohms between the two terminals, ignoring the
>parallel resistance of the diode.=C2
>Will either arrangement work?
I think the image above shows TWO resistors, one
across the lamp, a second in series with the lamp.
This configuration is used when you supply your
own, rudimentary LED (a 4 volt device).
If your proposed LED annunciator already features
a built in series resistor (12v device) then
you use ONE resistor between 3 and 5 on regulator.
Bob . . .
Message 3
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| Subject: | Re: SL-15 Audio Output |
Hi all,
Sorry for the late reply however life seems to get in the way.
I am about to leave on a 3 week trip so I will research this stuff whilst
gone.
One thing for sure is I will buy a 3 conductor patch cord and try it out
when I get back.
My cell phone is an LG Android type phone and it's the typical plug that
has a microphone and stereo earbuds. It works fine in our GMC Yukon for the
aux input (when at full volume... after pressing the olde yes I know that
loud volume can damage my hearing button... blah... blah... blah) so I
imagine it has plenty of zaps to run the zapp's to run the SL 15... yes I
tried full volume on the phone.
Thanks!!!!
Bill Hunter
On Mon, Dec 30, 2019, 20:15 Jeff B. <loboflyer@gmail.com> wrote:
> Bill:
>
> As a point of reference, my cell phone (Samsung Galaxy series) needs to b
e
> cranked to max output volume when hooked to my car audio line input for
> reasonable speaker volume. That includes clicking the "yeah, I meant it
to
> be that loud" box. Do you have the phone volume maxed?
>
> You say 4-conductor. How is that wired from the phone? I'd try a
> 3-conductor patch cable. Here's a forum post elsewhere that gives some
> clues to wiring
> <https://www.head-fi.org/threads/3-5-mm-jacks-4-vs-3-conductors.689100/#p
ost-9955513>.
> Apple vs. everyone else means that the microphone and ground are reversed
> between systems.
> (apologies if images aren't appearing... link should be good). By
> plugging in a 3-conductor cable you should be telling the phone to ignore
> the microphone.
>
> [image: image.png]
>
> From the SL-15 install manual:
> "The audio signal at the entertainment input must be a minimum of 500mV
> P-P per channel for optimum music performance." (Max is 1V P-P).
>
> [image: image.png]
>
>
> I think the SL-15 input impedance is 510 ohms (unsure if this applies to
> the entertainment inputs. Line level is typically 10's of k ohms.
>
> [image: image.png]
>
> You don't say what phone you're using, but Ken Rockwell has measured the
> iPhone 6S's headphone output
> <https://www.kenrockwell.com/apple/iphone-6s-plus-audio-quality.htm>and
> says it puts out 0.979V at 600 ohms (and I see no reason why it wouldn't
be
> representative of the general phone population):
>
> 600=CE=A9: 0.979 V RMS @ 0.0012% THD.
>
> At 600 ohms, 0.979 Vrms is 2.77Vpk-pk, so a phone should have no issue
> (over-) driving the input.
>
> -Jeff-
>
>
> On Mon, Dec 30, 2019 at 6:44 PM Charlie England <ceengland7@gmail.com>
> wrote:
>
>> On 12/30/2019 4:56 PM, billhuntersemail@gmail.com wrote:
>>
>> Happy New Years Eve Greetings!!!
>>
>> I was hoping for advice on how to fix a low audio problem I am having
>> with the audio input to the SL-15 in my airplane.
>>
>> Specifically, I connect my =9Csmart=9D phone to the 1/8 inch
audio input jack
>> of my SL-15 and I can just barely hear my crazy [party affiliation
>> redacted] political talk show that is playing from my telephone. The au
dio
>> is indeed playing however the volume is reallyreally low. Even
though my
>> wife is super happy with this setup I would like to fix if for those rea
lly
>> rare times when I allow her to play her media we can actually hear it ov
er
>> the continuous loud droning in the cabin (the airplane itself is very
>> quiet).
>>
>> If I unplug the cable connecting my phone to the ships audio input jack
>> and then insert my earbud headphones into the phone my political talk sh
ow
>> volume comes in loud, obnoxious, and opinionated as I expect so I have
>> confirmed that the phone output audio is working. I can hear the aircra
ft
>> radio as expected.
>>
>> I have soldered up the audio jack as depicted in the wire harness diagra
m
>> below and I am using a four conductor patch cable to connect the phone t
o
>> the ships input jack. Could this be the problem as I am mix matching
>> stereo and mono connectors?
>>
>> Here is a wire diagram of the SL-15 bottom connector.
>>
>> Any help (as usual) would be most appreciated!!!
>>
>> Hi Bill,
>>
>> I see two possibilities. One is that you wired it correctly, but the
>> audio panel is expecting a much higher level than the phone's headphone
>> jack is capable of providing. (This is a strong probability.) Look at th
e
>> audio panel's specs to see what level it wants on the music input, and t
hen
>> look at the phone's specs to see the max output from the headphone jack.
If
>> you need help translating dB to volts, etc, shoot us a followup email.
>>
>> Another possibility is, as you mentioned, a miswired cable. You said you
>> used a 4 wire cable. Note that there are only 3 possibilities at the aud
io
>> panel. If the cable has a 4 terminal plug at the audio panel, it's entir
ely
>> possible that the right channel pin in the audio panel connector could b
e
>> hitting both the R ring and the ground ring. You may need something with
>> the 4 conductor plug on one end, and a 3 conductor plug at the audio pan
el.
>> Unfortunately, a quick stroll through 'the google' didn't turn one up...
>>
>> Charlie
>> [image: Image result for cell phone headphone connector diagram"]
>>
>
Message 4
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| Subject: | Interesting King Air Complete Electrical Failure |
*A Carson Air Ltd. Beech B300 (C-GILK/CA611) from Vancouver, BC (CYVR) to
Campbell River, BC (CYBL) encountered electrical failure shortly after
take-off. Aircraft requested to return to CYVR before losing contact with
Vancouver (VR) Departure control. Aircraft then called the
Vancouver/Boundary Bay, BC (CZBB) tower via phone, declared an emergency
and landed on Runway 07 safely. No impact on operations.*
*Occurrence Summary*
Date Entered:
*2019-11-13*
Narrative:
*UPDATE from Airworthiness: A Civil Aviation Safety Inspector (CASI) looked
into this occurrence. Aircraft C-GILK started up at approximately 1500Z,
carried out pre-flight checks and positioned for take-off. Take-off
occurred at approximately 1512Z, through 400 feet the landing gear was
selected to up and both generators disconnected. The crew continued the
departure to the southwest and reached an altitude of 4551 feet at
approximately 1515Z and began a descent. The aircraft lost all power at
1516Z which put them 2.6NM NW of Boundary Bay Airport. The crew contacted
Boundary Bay (CZBB) Tower on a cell phone, declared an emergency and landed
safely after manually extending the landing gear. Total time in flight was
6.5 minutes. Maintenance investigated and noted the battery was still very
warm, indicating a high rate of discharge. It is suspected that an
internally failed battery coupled with a sudden high electrical load
(landing gear retraction) caused the system voltage to drop enough to
unlatch both generator buses. As this is not how the aircraft is designed
to react, maintenance is working with Beechcraft (Textron) technical
support for solutions. Once it is determined how the failure occurred an
Service Difficulty Report (SDR) will be submitted.*
*Occurrence Summary*
Date Entered:
*2019-12-04*
Narrative:
*Update TSB Report #A19P0139: C-GILK, a Beech B300 operated by Carson Air,
was conducting a flight from Vancouver Int'l (CYVR), BC to Campbell River
(CYBL), BC with 2 passengers and 2 flight crew on board. On take off, when
the crew retracted the landing gear, both generator annunciator lights
illuminated. The flight crew actioned the memory checklist items for a dual
generator failure. The crew began to declare an emergency with ATC when the
radios stopped working and the screens for the G1000 flight instrument
system failed. All electrical annunciators, communications and instruments
failed except for the emergency back-up standby attitude indicator and
altimeter. The crew were able to remain in VMC and elected to proceed to
Vancouver/Boundary Bay (CZBB), BC airport because the aircraft was already
proceeding in that direction. The first officer called the CZBB ATC tower
by cell phone and declared an emergency. The captain actioned the checklist
to manually extend the landing gear and the aircraft landed in CZBB without
further incident. The operator's maintenance found the aircraft's main
battery (Concorde p/n RG-380E/44K, s/n 40819077) was hot and testing at 20
volts. The main battery was removed and replaced with cap tested battery
(serial number 40885147).*
https://wwwapps.tc.gc.ca/saf-sec-sur/2/cadors-screaq/rd.aspx?cno%3d%26dtef%
3d%26dtet%3d2019-12-31%26otp%3d-1%26ftop%3d%253e%253d%26ftno%3d0%26ijop%3d%
253e%253d%26ijno%3d0%26olc%3d%26prv%3d-1%26rgn%3d-1%26tsbno%3d%26tsbi%3d-1%
26arno%3d%26ocatno%3d%26ocatop%3d1%26oevtno%3d%26oevtop%3d1%26evtacoc%3d3%2
6fltno%3d%26fltr%3d-1%26cars%3d-1%26acat%3d-1%26nar%3d%26aiddl%3d-1%26aidxt
%3d%26optdl%3d-1%26optcomt%3d%26optseq%3d%26optxt%3d%26opdlxt%3dResults%2bw
ill%2bappear%2bin%2bthis%2blist%26mkdl%3d-1%26mkxt%3d%26mdldl%3d-1%26mdlxt%
3d%26cmkdl%3dC%26cmkxt%3dGILK%26rt%3dQR%26hypl%3dy%26cnum%3d2019P2503
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