Today's Message Index:
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1. 06:18 AM - Re: 12v to 9v converter (Jim Merrill)
2. 12:03 PM - Matronics Email List Digest Operational Change... (Matt Dralle)
3. 01:46 PM - KX155 available (rd2)
4. 02:09 PM - Re: Re: 12v to 9v converter (Robert L. Nuckolls, III)
5. 02:56 PM - Re: Re: 12v to 9v converter (Charlie England)
6. 07:32 PM - Re: 12v to 9v converter (Eric Page)
Message 1
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| Subject: | Re: 12v to 9v converter |
Thanks for the excellent replies. My headsets have anr modules from Headsets Inc..
According to them the modules require " a very stable power supply.Do not
attempt to power them directly from the aircraft".They say voltage spikes and
static will damage the very sensitive circuits. Hmmmm!
They do sell ($40 each) a panel mount unit that has-"dual voltage regulators
and is isolated with a DC/DC converter. It seems to me that since I have no charging
system in the plane that isolation wouldn't be necessary.
The simplest solution would be to cough up $98 for 2 of their units but I am
the ultimate tightwad! Good call on the cheaper batteries- they are on my list
now!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=509597#509597
Message 2
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| Subject: | Matronics Email List Digest Operational Change... |
Dear Matronics Listers,
Beginning December 16, 2022, I am planning to modify the way Matronics List Digest
Email is handled. A Digest message will be sent daily ONLY if there is at
least ONE message posted to the Realtime List on the given day. If there are
no messages posted *No Digest will be sent*.
This change is being made to soften the SPAM filtering effect in the Internet at
large on the "Matronics.com" domain. Matronics.com is frequently unceremoniously
blocked because of perceived "SPAM" content. For example, yahoo.com along
with a number of other significant domains has been blocking matronics.com
for a long time.
Hopefully, this operational change will address the issue.
Matt Dralle
Matronics Email List & Forum Administrator
Message 3
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Hi listers,
Due to a panel upgrade our 28V KX155 w/GS along with tray, connector, and KI 209
indicator will be available. I had it just checked to make sure it is to spec
(recent 8130). If anyone is interested, please contact me off-list at rd2 at
dejazzd dot com.
Rumen
Message 4
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| Subject: | Re: 12v to 9v converter |
At 08:17 AM 12/16/2022, you wrote:
>
>Thanks for the excellent replies. My headsets have anr modules from
>Headsets Inc.. According to them the modules require " a very stable
>power supply.Do not attempt to power them directly from the
>aircraft".They say voltage spikes and static will damage the very
>sensitive circuits. Hmmmm!
Agree with the 3-terminal regulator solution but acquiring
a 7809 can be expensive. The part is available and cheap
https://tinyurl.com/2zcf3vcr
but shipping minimums are problematic.
The LM317 ADJUSTABLE regulator can be used too . . .
and I've got a fist full in a drawer. Can send
you a couple along with the resistors and capacitors
to craft your own VERY stable, VERY quiet, 9v
supply. *NOTE* changing from a battery (totally
isolated, floating supply) to a ship's system power
source raises potential for ground-loop generated
noises.
A quiet, ISOLATED ground, DC/DC converter would
probably work fine and bring no issues with it.
Those little Amazon offers are priced right
and a cheap experiment. It's easy to test
for input-output ground isolation.
> The simplest solution would be to cough up $98 for 2 of their
> units but I am the ultimate tightwad! Good call on the cheaper
> batteries- they are on my list now!
My intercom uses a 9v battery too . . . I can't remember
how many times I replaced it during 10+ years of
service . . . two maybe? Compared to other expenses
of operating the airplane, batteries for headsets
were trivial. In fact, for the last 10 years I was
actively flying, I would put fresh AA cells in my
DUAL hand held GPS receivers EVERY outbound departure
to avoid changing cells while airborne with risk
of dropping cell, battery case back, in turbulence
or dark etc.
Back then, AA cells from Sams were about $.26
each so the fresh-set-every-trip only added
about a dollar to the expense.
Of course, if your headsets use the clip-in
9V batteries, those are considerably more than
$.26! But then, how often do you need to replace
them?
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 5
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| Subject: | Re: 12v to 9v converter |
On 12/16/2022 4:09 PM, Robert L. Nuckolls, III wrote:
> At 08:17 AM 12/16/2022, you wrote:
>> <glastar5901@gmail.com>
>>
>> Thanks for the excellent replies. My headsets have anr modules from
>> Headsets Inc.. According to them the modules require " a very stable
>> power supply.Do not attempt to power them directly from the
>> aircraft".They say voltage spikes and static will damage the very
>> sensitive circuits. Hmmmm!
>
> Agree with the 3-terminal regulator solution but acquiring
> a 7809 can be expensive. The part is available and cheap
>
> https://tinyurl.com/2zcf3vcr
>
> but shipping minimums are problematic.
>
[snipped]
My bad; I should have just said, 'generic 1.5A 7809 regulator'.
Like
ebay regulator
<https://www.ebay.com/itm/295336432626?hash=item44c36c53f2:g:3PsAAOSw9YdfQAIV&amdata=enc%3AAQAHAAAAkPGyaruPFwk7evYbjo3gDb80EFq4AGxzrKozKXpGPqz%2Bh0B6GrReCgtd8bVaJrWUwUBd1h1Djz7aStijcA7Siga6g0%2B%2BrMzejHleBRDUEMG9L22G%2F3gagpAX9GNPI%2BOK4hW4BuLyRGAY9tpMfvkTXdvi5oH6xEg4a4Sd%2F2eRNAWvqEbu4FMWcz%2FB08Xjk7APcg%3D%3D%7Ctkp%3ABk9SR8iV5dGjYQ>
Or, for a lifetime supply for any conceivable a/c need:
Amazon regulator kit
<https://www.ebay.com/itm/295336432626?hash=item44c36c53f2:g:3PsAAOSw9YdfQAIV&amdata=enc%3AAQAHAAAAkPGyaruPFwk7evYbjo3gDb80EFq4AGxzrKozKXpGPqz%2Bh0B6GrReCgtd8bVaJrWUwUBd1h1Djz7aStijcA7Siga6g0%2B%2BrMzejHleBRDUEMG9L22G%2F3gagpAX9GNPI%2BOK4hW4BuLyRGAY9tpMfvkTXdvi5oH6xEg4a4Sd%2F2eRNAWvqEbu4FMWcz%2FB08Xjk7APcg%3D%3D%7Ctkp%3ABk9SR8iV5dGjYQ,or,
for a lifetime supply meeting every conceivable a/c
need:,https://smile.amazon.com/BOJACK-Package-Positive-Regulator-Assortment/dp/B07T5ZHY63/ref=sr_1_1_sspa?crid=3HCXSN27IUIM3&keywords=lm7809&qid=1671230714&sprefix=lm7809%2Caps%2C104&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExSVcwRjMyN1E2QjJFJmVuY3J5cHRlZElkPUEwODcxMjI5M0U1VTEzSzFOMk9aOSZlbmNyeXB0ZWRBZElkPUEwMjcwMDI4MllKVUVJM1RPNjI1NCZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=>
Charlie
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Message 6
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| Subject: | Re: 12v to 9v converter |
Jim Merrill wrote:
> Edit- I just saw these-
> https://www.amazon.com/NOYITO-Terminal-Voltage-Regulator-Module/dp/B08BZG8MZ8/ref=sr_1_4?crid=1KV3C1L94CT9P&keywords=lm7809&qid=1671204614&sprefix=lm7809%2Caps%2C122&sr=8-4
> any advantage to these over the voltage regulator by itself?
Yes, indeed. The 7809 version of that is exactly what you want: all the necessary
components neatly packaged on a small board. You probably couldn't source
the parts for those modules for what they're charging for them.
After you screw down the terminals good and tight on your wires, put a few drops
of superglue on them so they won't vibrate loose on you.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=509686#509686
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