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"Starter Engaged" Warning Light Circuit Refresher

 
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bobair(at)me.com
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PostPosted: Thu Feb 17, 2011 7:39 pm    Post subject: "Starter Engaged" Warning Light Circuit Refresher Reply with quote
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. If incandescent, is the protection diode required? Recommended? If incandescent, is the resistor required? Recommended? If the lamp is an LED, same questions.

I can modify the circuit pretty easily right now but I'm towards the end of running all my wires in the plane and will be finishing all the harnesses soon.

Thanks, as always, and

Best regards,

Bob Falstad
GlaStar N248BF

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rickofudall



Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
PostPosted: Fri Feb 18, 2011 2:47 pm    Post subject: "Starter Engaged" Warning Light Circuit Refresher Reply with quote
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(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
Quote:
At 10:34 PM 2/17/2011, you wrote:
Quote:
--> AeroElectric-List message posted by: Bob Falstad <bobair(at)me.com (bobair(at)me.com)>

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

[img]cid:7.1.0.9.0.20110218094700.01d98650(at)aeroelectric.com.0[/img]

This is an Light Emitting Diode

[img]cid:7.1.0.9.0.20110218094700.01d98650(at)aeroelectric.com.1[/img]

  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

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