Today's Message Index:
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1. 09:12 AM - RAC dual rp3 led indicator ckt. (Bill S)
2. 12:06 PM - Re: Cessna dual electronic stall/gear warning horn (Robert L. Nuckolls, III)
3. 12:09 PM - Re: RAC dual rp3 led indicator ckt. (Robert L. Nuckolls, III)
4. 01:04 PM - Re: Re: RAC dual rp3 led indicator ckt. (Mark Wesson)
5. 01:31 PM - Re: Re: RAC dual rp3 led indicator ckt. (Richard Tasker)
6. 02:19 PM - New Electronic Device "Smart" Charging Source (Mike Welch)
Message 1
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| Subject: | RAC dual rp3 led indicator ckt. |
Bob a while back you drew up a ckt to drive two RAC RP3 indicaters from one
servo output. Cant find it. And could you add the component values to the
ckt drawing. Thanks Bill S.
Message 2
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| Subject: | Re: Cessna dual electronic stall/gear warning horn |
At 08:27 AM 8/27/2013, you wrote:
>Hi Bob,
>
>I wonder if you can help me with a problem. A partner and I
>recently purchased a 1977 Cessna 177RG which has a dual electronic
>stall warning and gear warning system which is only heard through
>the dual overhead cabin speakers. The stall warning is output
>through one speaker as a steady on stall warning, while the gear
>warning is output through the second speaker (slightly different
>tone) as an intermittent on/off gear warning. I find it difficult to
>hear the stall horn or the gear warning horn when wearing a noise
>cancelling headset. Question: is there a way to convert the
>electric output that drives the two overhead speakers into an
>electronic output which could be fed into a PMA8000BT audio
>panel? Perhaps there is a device I could interface between the dual
>electronic stall/gear warning and the PMA8000BT audio panel, or
>maybe this could be fabricated with relays and off the shelf electronic parts.
>
>I checked with the audio panel manufacturer, PS Engineering, but
>they said it's not possible to convert an electromechanical warning
>into and electronic signal.
>
>Thanks in advance for your advice Bob.
HHHmmmm. . . . I think the PSE guys missed the boat on
this one. An ELECTROMECHANICAL horn is an enhanced buzzer
with a diaphragm added for greater sound output. This
is an exemplar horn used on MANY thousands of S.E. aircraft.
The warning tones for this style of horn cannot be electrically
'mixed' into the signals that drive your overhead speakers.
Emacs!
I designed an electronic stall/gear warning tone
generator for the Bonanza/Baron lines at Beech about
1980 time frame. This was not electro-mechanical
and used a special speaker I had specified for
very poor response as an audio device but very
efficient and with an aluminum cone for environmental
robustness.
The tones from this device could have been integrated
into the ship's audio system . . . but it was never
requested . . . at least while I was at Electro-Mech.
Similarly, the warning tones that are applied to
your cabin speakers CAN be tapped, conditioned and
mixed into your PMA8000 audio system.
The installation manual wiring diagrams show "unswitched audio
inputs . . .
Emacs!
. . . with references to notes 6, 10, 11 . . .
Emacs!
From this data I deduce that input #1 is always ported
to both speakers (if connected) and headset audio
irrespective of condition for any system controls.
There MIGHT be a simpler way to do this but without
more cogent knowledge of how all the components
are built and wired, the most conservative approach
has a 99% probability of being good-out-of-the-box.
Consider this interface circuit for tapping your speaker
wiring and routing through isolation transformers
to eliminate all possibilities for ground loops and/or
unanticipated sneak paths. Two potentiometers will
allow you to adjust the volume of each tone independently
before they are mixed and applied to US-Input #1.
Emacs!
You can try single-turn pots if you like but I think
the multi-turn, screwdriver adjust will provide a more
vernier command of the audio levels and will 'stay put'
with time.
Bob . . .
Message 3
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| Subject: | Re: RAC dual rp3 led indicator ckt. |
At 11:04 AM 8/27/2013, you wrote:
>Bob a while back you drew up a ckt to drive two RAC RP3 indicaters
>from one servo output. Cant find it. And could you add the
>component values to the ckt drawing. Thanks Bill S.
I don't recall the specific posting but the
solutions are simple. During discussions
about the RayAllen products on the List,
the operating voltage the position reporting
potentiometer in the actuator was reported . . .
I don't recall if it was 5 or 12v.
Can someone on the List cite the actual value?
Also, I'm guessing that the ORN wire out of
the indicator is the excitation voltage for
the pot, the GRN wire is the pot wiper and
the BLU wire is ground . . . yes?
Bob . . .
Message 4
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| Subject: | Re: RAC dual rp3 led indicator ckt. |
The operating voltage of the indicator is 5v and the wiring colors you state
are correct.
Mark Wesson
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Tuesday, August 27, 2013 3:07 PM
Subject: AeroElectric-List: Re: RAC dual rp3 led indicator ckt.
--> <nuckolls.bob@aeroelectric.com>
At 11:04 AM 8/27/2013, you wrote:
>Bob a while back you drew up a ckt to drive two RAC RP3 indicaters
>from one servo output. Cant find it. And could you add the
>component values to the ckt drawing. Thanks Bill S.
I don't recall the specific posting but the
solutions are simple. During discussions
about the RayAllen products on the List,
the operating voltage the position reporting
potentiometer in the actuator was reported . . .
I don't recall if it was 5 or 12v.
Can someone on the List cite the actual value?
Also, I'm guessing that the ORN wire out of
the indicator is the excitation voltage for
the pot, the GRN wire is the pot wiper and
the BLU wire is ground . . . yes?
Bob . . .
Message 5
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| Subject: | Re: RAC dual rp3 led indicator ckt. |
Attached is a crude schematic of the Ray Allen indicator.
As you can see your colors listed are correct.
Dick Tasker
Robert L. Nuckolls, III wrote:
>
> At 11:04 AM 8/27/2013, you wrote:
>> Bob a while back you drew up a ckt to drive two RAC RP3 indicaters from one
servo output. Cant find it. And could
>> you add the component values to the ckt drawing. Thanks Bill S.
>
> I don't recall the specific posting but the
> solutions are simple. During discussions
> about the RayAllen products on the List,
> the operating voltage the position reporting
> potentiometer in the actuator was reported . . .
> I don't recall if it was 5 or 12v.
>
> Can someone on the List cite the actual value?
> Also, I'm guessing that the ORN wire out of
> the indicator is the excitation voltage for
> the pot, the GRN wire is the pot wiper and
> the BLU wire is ground . . . yes?
>
>
> Bob . . .
>
>
Message 6
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| Subject: | New Electronic Device "Smart" Charging Source |
List members,
Every month or two, I get a product promotion or discount offer from a company
I bought
a wide-band Oxygen sensor from. I'm already familiar with them and they make good
stuff!
The company is called PLX Devices, and they make incredible high quality products,
gages,
etc, mostly for the auto industry.
Since batteries are frequently a hot topic on this list, especially lithium
batteries, I thought
I'd share this.
I got an ad today on their 'not yet built' smart portable battery charger'.
This would be handy
for those tech guys that have, iPhone, iPods, iPads, Laptops, GPS's, or frankly
pretty much
anything that needs to be charged. This might be a life-saver power source for
some pilots
needing a high capacity "smart" charging station.
I don't get any kickbacks from them people, I just thought there might be some
pilots on this list
that would be interested in the product. You might notice all the features, watch
the video for
more into. I think it would seem to be handy for some folks.
http://www.kickstarter.com/projects/plxdevices/legion-the-battery-reinvented
Mike Welch
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