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user9253
Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan
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 Posted: Mon Mar 09, 2020 5:08 am Post subject: HEADSET POWER SUPPLY |
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A friend of mine wants to power his David Clark headsets from 14 VDC
aircraft power instead of using the 9 volt battery box that came with the
headset. He said that the electronics inside of the headset have been
replaced, so the model number of the headset is irrelevant.
My question is, can the headsets be powered directly by 14 VDC aircraft
power, or should the voltage be dropped to 9 VDC and some filter capacitors added?
Thanks, Joe
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Joe Gores |
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nuckolls.bob(at)aeroelect
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| Posted: Mon Mar 09, 2020 7:44 am Post subject: HEADSET POWER SUPPLY |
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At 08:08 AM 3/9/2020, you wrote:
| Quote: | --> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>
A friend of mine wants to power his David Clark headsets from 14 VDC
aircraft power instead of using the 9 volt battery box that came with the
headset. He said that the electronics inside of the headset have been
replaced, so the model number of the headset is irrelevant.
My question is, can the headsets be powered directly by 14 VDC aircraft
power, or should the voltage be dropped to 9 VDC and some filter capacitors added?
Thanks, Joe |
We cannot know if the device would run reliably
on 14v. The safe thing to do is duplicate the
obvious and provide a quiet 9v source. It's
a low-risk experiment . . . it will either
be quiet enough . . . or not. Start here:
[img]cid:.0[/img]
The 3-terminal regulators are powerful noise
filters in themselves. Likelihood of success
is high.
Make sure there is a common ground between
head-set plug shells and the (-) lead to
the 9v battery. There is a remote chance
that the audio amplifier does not share
common ground with the ship's audio grounds.
Bob . . .
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user9253
Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan
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| Posted: Mon Mar 09, 2020 8:33 am Post subject: Re: HEADSET POWER SUPPLY |
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Bob, thanks for the great advice and schematic. Joe
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Joe Gores |
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ceengland7(at)gmail.com
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| Posted: Mon Mar 09, 2020 9:41 am Post subject: HEADSET POWER SUPPLY |
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On 3/9/2020 10:40 AM, Robert L. Nuckolls, III wrote:
| Quote: | At 08:08 AM 3/9/2020, you wrote:
| Quote: | --> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com> (fransew(at)gmail.com)
A friend of mine wants to power his David Clark headsets from 14 VDC
aircraft power instead of using the 9 volt battery box that came with the
headset. He said that the electronics inside of the headset have been
replaced, so the model number of the headset is irrelevant.
My question is, can the headsets be powered directly by 14 VDC aircraft
power, or should the voltage be dropped to 9 VDC and some filter capacitors added?
Thanks, Joe |
We cannot know if the device would run reliably
on 14v. The safe thing to do is duplicate the
obvious and provide a quiet 9v source. It's
a low-risk experiment . . . it will either
be quiet enough . . . or not. Start here:
[img]cid:part1.086F674B.D9E2CE91(at)gmail.com[/img]
The 3-terminal regulators are powerful noise
filters in themselves. Likelihood of success
is high.
Make sure there is a common ground between
head-set plug shells and the (-) lead to
the 9v battery. There is a remote chance
that the audio amplifier does not share
common ground with the ship's audio grounds.
Bob . . . |
FWIW, I've had excellent luck using LM78xx fixed voltage regulators with no external components, as voltage dropping regulators in both cars and airplanes. LM7809 would give 9V output. Wired similar to the 317, with in/GND/out. I just used an LM7805 to power a serial output GPS puck (5V power supply required), used as position source for a GRT HX EFIS.
No external components, no risk of drift, etc. In extremely low current applications like mine, I could get away with no heat sink. Might be different with the Bose; I have no idea on its power consumption.
Charlie
 Virus-free. www.avast.com [url=#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2] [/url]
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