Today's Message Index:
----------------------
1. 07:11 AM - Re: Power for Checking Systems Out on the Ground (Allen Fulmer)
2. 07:58 AM - Re: "Starter Engaged" Warning Light Circuit Refresher (Robert L. Nuckolls, III)
3. 09:10 AM - Re: Power for Checking Systems Out on the Ground (Robert L. Nuckolls, III)
4. 02:00 PM - Re: Power for Checking Systems Out on the Ground (Allen Fulmer)
5. 02:47 PM - Re: "Starter Engaged" Warning Light Circuit Refresher (Richard Girard)
6. 03:06 PM - Re: "Starter Engaged" Warning Light Circuit Refresher (Robert L. Nuckolls, III)
7. 03:38 PM - LED question (Noel Loveys)
8. 04:21 PM - Re: LED question (Robert L. Nuckolls, III)
9. 09:12 PM - Looking for Cool (Digital) Ammeter (Jeff Luckey)
10. 09:53 PM - Corvair wiring (Dale Andee)
Message 1
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| Subject: | Power for Checking Systems Out on the Ground |
Bob,
I there a drawing showing the circuit you describe below? And values/part
no. for the power diode and relay?
Thanks,
Allen Fulmer
Do not archive
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Monday, February 14, 2011 11:07 AM
Subject: Re: AeroElectric-List: Power for Checking Systems Out on the Ground
Can I hook the power supply up to the battery + and - terminals and use it
as a "battery booster" (or would this toast the battery)? Should I just use
the battery and charge it overnight with the BatteryMINDer? Other?
Most power supplies are NOT intended to work
in conjunction with a battery. The primary
difficulty arises when the battery is connected
to a powered down power supply. Output monitoring
and ov protection in many supplies do not like to
be "back fed" from an external power source.
My favorite technique uses a hefty switchmode
power supply similar to this:
<http://tinyurl.com/4aoszlf> http://tinyurl.com/4aoszlf
Combine this supply with a power diode (to
prevent back feeding) and a relay to emulate
the "field control" input on your ship's
alternator. The relay controls 120 vac going
into the power supply.
You can connect this AC mains powered "alternator"
in place of the ship's alternator. With the
alternator emulator ON, adjust the power supply
for a 14.2 volt bus.
The ship's load meter (if installed) can be
used to monitor loads on the power supply. This
will allow you to run the ship's battery in
parallel to let it pick up any transient loads
that might exceed the ratings of the power supply.
I intend to bring up one circuit at a time and I want to measure each
circuit's actual power consumption and I'll need to be careful not to
overload the power supply.
If it's a switchmode supply, it will have built
in overload protection. Further, the supply I
linked above has a thermostatically controlled
fan built in that turns on when the supply is
being taxed to rated output.
Bob . . .
Message 2
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| Subject: | Re: "Starter Engaged" Warning Light Circuit Refresher |
At 10:34 PM 2/17/2011, you wrote:
>
>Bob N.,
>
>I'm putting a "starter engaged" warning light in my new IFR
>panel. I simply hooked the incandescent bulb from my B&C
>alternator "low voltage" warning light between a fused wire that
>runs from the hot side of the starter contactor and ground. (I now
>have the standby B&C alternator and will use its controller's
>"standby alternator on" light in lieu of the low voltage light on
>the primary alternator controller.)
>
>But then I ran across a handwritten sketch that I believe you drew
>up for this circuit. It has a 470 Ohm - 1 Watt resistor in the wire
>between the hot side of the starter contactor and the lamp. It also
>shows a 1N4001 protection diode in parallel with the lamp and
>ground. It isn't clear from your sketch (and my electrical symbols
>knowledge is limited) whether the lamp is incandescent or an LED.
This is an incandescent lamp
Emacs!
This is an Light Emitting Diode
Emacs!
The resistor used with the LED warning circuit as
sketched serves a dual purpose. It protects the wire
that runs from starter to lamp by limiting the maximum
current that could flow in a faulted wire. At the same
time, it SETS the current intended to illuminate the
LED.
For an incandescent warning light, the resistor is
replaced with a fuse and the incandescent lamp is
substituted for the LED. No reverse current diode
is needed.
Bob . . .
Message 3
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| Subject: | Power for Checking Systems Out on the Ground |
At 10:03 AM 2/18/2011, you wrote:
>Bob,
>
>Is there a drawing showing the circuit you describe below? And
>values/part no. for the power diode and relay?
http://aeroelectric.com/Pictures/Schematics/Line_Powered_Alternator_Emulator.pdf
Power supply http://tinyurl.com/4lqfl8p
Diode http://tinyurl.com/4cft9g3
http://tinyurl.com/488ztot
http://www.bandc.biz/essentialbusdiode-1.aspx
Relay http://www.bandc.biz/spdtsealedrelay12v40a.aspx
Bob . . .
Message 4
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| Subject: | Power for Checking Systems Out on the Ground |
Thanks you Bob.
Do not archive
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Friday, February 18, 2011 10:06 AM
Subject: RE: AeroElectric-List: Power for Checking Systems Out on the Ground
At 10:03 AM 2/18/2011, you wrote:
Bob,
Is there a drawing showing the circuit you describe below? And values/part
no. for the power diode and relay?
http://aeroelectric.com/Pictures/Schematics/Line_Powered_Alternator_Emulator
.pdf
Power supply <http://tinyurl.com/4lqfl8p> http://tinyurl.com/4lqfl8p
Diode <http://tinyurl.com/4cft9g3> http://tinyurl.com/4cft9g3
http://tinyurl.com/488ztot
http://www.bandc.biz/essentialbusdiode-1.aspx
Relay http://www.bandc.biz/spdtsealedrelay12v40a.aspx
Bob . . .
Message 5
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| Subject: | Re: "Starter Engaged" Warning Light Circuit Refresher |
Bob N., Is the drawing for this circuit in the Aeroelectric archives? I
think I'd like to add it to my very bare bones system.
Thanks,
Rick
On Fri, Feb 18, 2011 at 8:54 AM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 10:34 PM 2/17/2011, you wrote:
>
>
> Bob N.,
>
> I'm putting a "starter engaged" warning light in my new IFR panel. I
> simply hooked the incandescent bulb from my B&C alternator "low voltage"
> warning light between a fused wire that runs from the hot side of the
> starter contactor and ground. (I now have the standby B&C alternator and
> will use its controller's "standby alternator on" light in lieu of the low
> voltage light on the primary alternator controller.)
>
> But then I ran across a handwritten sketch that I believe you drew up for
> this circuit. It has a 470 Ohm - 1 Watt resistor in the wire between the
> hot side of the starter contactor and the lamp. It also shows a 1N4001
> protection diode in parallel with the lamp and ground. It isn't clear from
> your sketch (and my electrical symbols knowledge is limited) whether the
> lamp is incandescent or an LED.
>
>
> This is an incandescent lamp
>
> [image: Emacs!]
>
> This is an Light Emitting Diode
>
> [image: Emacs!]
>
> The resistor used with the LED warning circuit as
> sketched serves a dual purpose. It protects the wire
> that runs from starter to lamp by limiting the maximum
> current that could flow in a faulted wire. At the same
> time, it SETS the current intended to illuminate the
> LED.
>
> For an incandescent warning light, the resistor is
> replaced with a fuse and the incandescent lamp is
> substituted for the LED. No reverse current diode
> is needed.
>
>
> Bob . . .
>
--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
Message 6
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| Subject: | Re: "Starter Engaged" Warning Light Circuit Refresher |
At 05:43 PM 2/18/2011, you wrote:
>Bob N., Is the drawing for this circuit in the Aeroelectric
>archives? I think I'd like to add it to my very bare bones system.
http://aeroelectric.com/Pictures/Schematics/Starter_Engaged_Warning_Lt.pdf
>Bob N.,
>
>I'm putting a "starter engaged" warning light in my new IFR
>panel. I simply hooked the incandescent bulb from my B&C
>alternator "low voltage" warning light between a fused wire that
>runs from the hot side of the starter contactor and ground. (I now
>have the standby B&C alternator and will use its controller's
>"standby alternator on" light in lieu of the low voltage light on
>the primary alternator controller.)
>
>But then I ran across a handwritten sketch that I believe you drew
>up for this circuit. It has a 470 Ohm - 1 Watt resistor in the wire
>between the hot side of the starter contactor and the lamp. It also
>shows a 1N4001 protection diode in parallel with the lamp and
>ground. It isn't clear from your sketch (and my electrical symbols
>knowledge is limited) whether the lamp is incandescent or an LED.
This is an incandescent lamp
Emacs!
This is an Light Emitting Diode
Emacs!
The resistor used with the LED warning circuit as
sketched serves a dual purpose. It protects the wire
that runs from starter to lamp by limiting the maximum
current that could flow in a faulted wire. At the same
time, it SETS the current intended to illuminate the
LED.
For an incandescent warning light, the resistor is
replaced with a fuse and the incandescent lamp is
substituted for the LED. No reverse current diode
is needed.
Bob . . .
Message 7
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Bob: is it OK to wire an LED directly (through a resistor in series) to a
14V system? Or should a voltage reduction circuit/device be used. I always
though most LEDs were supposed to work on 5V. And 14V would be too much.
Noel
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: February 18, 2011 11:25 AM
Subject: Re: AeroElectric-List: "Starter Engaged" Warning Light Circuit
Refresher
At 10:34 PM 2/17/2011, you wrote:
Bob N.,
I'm putting a "starter engaged" warning light in my new IFR panel. I simply
hooked the incandescent bulb from my B&C alternator "low voltage" warning
light between a fused wire that runs from the hot side of the starter
contactor and ground. (I now have the standby B&C alternator and will use
its controller's "standby alternator on" light in lieu of the low voltage
light on the primary alternator controller.)
But then I ran across a handwritten sketch that I believe you drew up for
this circuit. It has a 470 Ohm - 1 Watt resistor in the wire between the
hot side of the starter contactor and the lamp. It also shows a 1N4001
protection diode in parallel with the lamp and ground. It isn't clear from
your sketch (and my electrical symbols knowledge is limited) whether the
lamp is incandescent or an LED.
This is an incandescent lamp
Emacs!
This is an Light Emitting Diode
Emacs!
The resistor used with the LED warning circuit as
sketched serves a dual purpose. It protects the wire
that runs from starter to lamp by limiting the maximum
current that could flow in a faulted wire. At the same
time, it SETS the current intended to illuminate the
LED.
For an incandescent warning light, the resistor is
replaced with a fuse and the incandescent lamp is
substituted for the LED. No reverse current diode
is needed.
Bob . . .
Message 8
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| Subject: | Re: LED question |
At 06:20 PM 2/18/2011, you wrote:
>Bob: is it OK to wire an LED directly (through a resistor in series)
>to a 14V system? Or should a voltage reduction circuit/device be
>used. I always though most LEDs were supposed to work on 5V. And
>14V would be too much.
LED's are CURRENT driven devices. They do drop 2-3 volts
across the device while illuminated (depending on color)
but they can be BIASED up to run at ANY voltage greater
than 3 volts by selection of the series resistor . . . which
is the purpose of the 470 ohm resistor in the sketch. With
9-12v applied to the starter and 2v dropped across the
LED leaves 7 to 10 volts drop across the 470 ohm resistor.
This translates to an LED operating current on the order of
(7/470) 15 to (10/470) 21 milliampers.
Bob . . .
Message 9
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| Subject: | Looking for Cool (Digital) Ammeter |
Group,
Here's what I want:
I want to mimic the good old zero-center ammeter but in a digital format.
1. digital readout of current in the center with bar graphs to the left
and right indicating the magnitude of the charge or discharge.
2. could be LED or LCD
3. each segment of the bar graph would represent say, 5 amps
4. Instrument face - no more than 3 in. wide by 1.5 in. tall
5. scale +- 60 amps, external shunt, 12v power
6. self dimming
Artwork (the equal sign indicates lit segments):
---------- 0 ----------
---------- 10 ==-----
-----==== -20 ----------
I've googled a bit but haven't seen anything like this. Have you?
TIA
Message 10
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Group,
I'm new here and seeking some help for my Corvair powered airplane. Attache
d is a diagram that began as the Z-9 drawing to which I've made mostly dele
tions. The fuel pump circuits have been deleted as I'm using a gravity feed
system.-
You will also note the elimination of a fuse for the secondary ignition cir
cuit. William Wynn recommends that there be no fuses, breakers, ect in the
ignition wiring. I do show a 7A in the primary ignition circuit (that may n
eed to be increased but I don't have that spec as yet).
Could I also get some comments on the battery contactor? I know some say it
isn't needed and that a good master switch can handle all of the amps that
the system will need. The Dynamo is 20A and the main fuse is 30A.
Any suggested changes and the reasons for the changes are appreciated. Plea
se be aware that I'm not the sharpest pencil in the box when it comes to el
ectrical wiring so your patience and elementary type answers are much appre
ciated. -8~)
Thanks in advance for all your help.
Dale-=0A=0A=0A
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