Oasis 737 Project

[737NGer]

Does anyone know what this module is, just below the F/O clock?

[mickc]

Its the annunciator panel for the HGS system (head up display)

[737NGer]

Thanks Mick


Is it the same as the one on the pedestal?


Is it an airline option, or is it standardised on the NG?

[mickc]

No, the one on the pedestal is the actual control panel for the HUD, the on under the clock just shows the mode, status and failure annunciators.

Not standard on the NG, its an airline/customer option, but they are becoming more popular these days. 

[737NGer]

Any Idea what the P/N is for this panel?

Does it function like most other panels (basic I/O) or ARINC 429?

[navymustang]

I have this panel in my sim. PM me and I can send you details.
Jim

[737NGer]

PM Sent

[737NGer]

Hello,

Do all Blue Annunciators in the overhead have both dim and bright indications, or only some of the annunciators?

[mickc]

Only the ones that relate to a valve, eg spar valve, crossfeed valve, anti-ice valves etc have 2 states depending on the valve's commanded vs actual position

The gnd power, gen off bus lights, ram door & call lights are bright only  (plus on the real plane you have the bright / dim function for normal annunciators)

[737NGer]

Thank you Mick.

Does the MAINT annunciator on P5-4 APU Panel have a bright and dim mode?

[mickc]

Negative, only the normal master bright/dim

[737NGer]

Thank you.

A great help as always!

[737NGer]

Can anyone clarify what this circuit symbol means?

[navymustang]

Not in any of my reference manuals. Could it be a rotary switch?

[737NGer]

Don't think it's a rotary. Nothing mechanically operated, as it's part of a PCB I think.

I found it in a Boeing manual.

Here's another schematic

Could it be a relay?

[Garys]

Its a logic/solid state switch. Only found inside boxes.

[737NGer]

Excuse my noob electronics knowledge, but shouldn't there be a return or ground?

How does it work exactly?

[Garys]

These are not mechanical switches and are commonly used with logic gates as well. These are all inside LRU's (Line replaceable units) on circuit boards.

[mickc]

Exactly what Garys said.  It will most likely be a switching transistor, that will switch depending on what it sees on pin 31 according to the diagram.  It's a bit hard to tell without seeing the whole schematic.

[737NGer]

Turned out to be a transistor. The switch was just a simplification it seems. In another schematic, the switch is replaced with a transistor.

[737NGer]

Testing out circuits and going through schematics.

In need of a circuit simulator software as well as a PCB design software.

Any recommendations?

Thanks,
Youssef

[Joe Lavery]

Fritzing is a simple circuit design program, which is also free.
http://fritzing.org/download/

Or if you need something more substantial there's EagleCad, or the one I use is DesignSpark PCB, which is also free.
https://www.autodesk.com/products/eagle/free-download
https://www.rs-online.com/designspark/pcb-software

There are also a number of free Circuit Simulators, although I've never used any of them.
http://nl5.sidelinesoft.com/index.php?page=buy&lang=en
http://qucs.sourceforge.net/
https://easyeda.com/

Hope that helps,
Joe.

[737NGer]

Thank you very much Joe.

[737NGer]

This terminal labelled 5V ... Does it supply +5VDC to the circuit or does it do something else? ?

This is a Phidgets 1012 card.

[Joe Lavery]

There is no power input socket on this board, so I would guess that the 5 volts is tapped from your USB.
I also see from the schematic on the Phidgets website that there's a 5 volt and ground connector on both sides, but the data doesn't really mention them. 

http://www.phidgets.com/products.php?category=0&product_id=1012_2
Manuals at the bottom on the page!

It's an input / output board, so I'm surprised there's no power input, but in all honesty I'm not familiar with it. I would drop Phidgets a line or try their forum.
If you do use it and make use of the 5volt connector, I would be careful not to draw much current or you could blow the USB port on your PC. 

Joe.