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  1. #11
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    Re: Delco Carousel IV-A INS CDU/MSU

    > I have the MSU reverse engineered - switches, lamps and wires, easy as you say.

    Are you willing to share the info you retrieved? Which pin connects what? It would be extremely useful!

    > On my MSU the Bat/Nav lights are accessible from the front.

    By unscrewing the transparent red and green plastic "covers"?
    I fear I could damage them...

    > Only replacing a backlight bulb requires disassembling the front panel.
    Did you managed to detach the mode selector knob?

    Question: Did you try to light up the bulbs? How many Volts? And...AC or DC? Do you think they could be powered up from an Arduino?

    > My actual plan is to reverse trace connections from switches and seven segment displays to motherboard, then design
    > new PCBs to drive all from the mobo connectors. Jackpilot said to have some diagrams, but seems dormant at this
    > time.

    Interesting! But are you planning to power bulbs with a separate power supply?
    I was also looking into the possibility to take out the "primitive" 7 segment displays and substitute them with real 7 segment displays but there are problems with commas/apostrophe and the right hand N/S and E/W "icons"...

    NOTE: I don't know if we are actually abusing of this forum. If so I'd have no problem creating a new "Hardware" forum on Simufly.com. Please (admin?) let us know!

  2. #12
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    Re: Delco Carousel IV-A INS CDU/MSU

    A bulb is agnostic to AC / DC, either will do. Nowaydays a DC voltage is convenient with switch mode power supplies. IIRC the Bat/Ready bulbs are 12 V at least. Test by slowly increasing a power supply measuring Volts and Amps. Backlighting is 5V for sure.

    Yeah, you unscrew the red and green plastic covers. The knob came lose by using a Inbus/Hex allen wrench. Many of these screws are multispline, successfully destroyed by people inserting inappropriate Inbus/Hex allen. In that case your only resort is careful drilling out.

    The seven seg displays are not multiplexed, I guess each bulb to oprate at 4 - 5 V 20 mA. Yeah, you need a real 2 A power supply here.
    Siempre chevere!

  3. #13
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    Re: Delco Carousel IV-A INS CDU/MSU

    Hello Jörg,

    so, from what I understood, you are willing to retain all the bulbs (those simulating the 7 segment displays).
    What about if a bulb breaks, how do you fix it?

    My plans are to substitute everything (all bulbs) with LEDs and/or real 7-segment displays.
    If possible, of course
    I want (would like) to have everything working at 5V. Big problem will be to put LEDs inside illuminated CDU keys...

    Questions for you:

    a) Are you going to use it with MSFS or xPlane?
    b) What are you planning to put inside to drive everything? RPi? Arduino? Custom electronics?

    Thank you,
    Marco

  4. #14
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    Re: Delco Carousel IV-A INS CDU/MSU

    Jörg,

    here (http://www.dtic.mil/dtic/tr/fulltext/u2/a264521.pdf) there are some (very few) details about CIVA INS electrical supply. Hope this helps...

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