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Surely, with all the smart guys and gals we have on VAF, we can come up with a solution. I see it as a safety thing.
Tom |
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You would loose the light on the button, but you would have the glare shield light instead. |
can you swap the pushbutton
If you can switch out the pushbotton on your stick with a toggle switch I have a solution for you.
I don't know of an on-off-on pushbutton. This would also work if one existed. |
Caution
The LEDs as well as the pushbutton switchs are controlled by FPGAs with TTL control. I do not recommend bringing those signals out of the audio panel, these signals would have to be conditioned before meeting the outside world.
Mark PS Engineering, Inc. Quote:
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If you want to build a box with some relays:
1. Wire your flip-flop stick button to cause a latching relay to flip. 2. Wire that latching relay to control other relays, which will: A. Connect your mike, PTT, and headphones alternately to the pilot inputs, or the copilot inputs, on the audio panel; and B. drive indicator lights on the glare shield. 3. Put your audio panel into the multiplex mode, or whatever it is called (designed to let the copilot transmit on com 2 while the pilot transmits on com 1.) Basically you are flipping yourself from pilot position to copilot position. Edit: I see PS calls this "split mode", not multiplex. Mark, what do you think? |
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12V 4PDT relays are easy to find. You can get sockets that make wiring with ring terminals easy. Route the pilot's mic wires through two poles, intercom to the NC contacts and radio to the NO contacts. Use one of the remaining poles for PTT. Radio PTT to the common, NC contact to the intercom PTT out, and ground the NO contact. Wire the Relay coil to the second PTT switch. The downside is that if the relay fails, you could lose the ability to transmit. Solid state switching would have higher reliability, but the mechanical life of most of these relays is in excess of 20 million operations anyway. There is also a possibility that you could run into issues with hearing your transmissions on the other radio; you could use the fourth contact to mute it if necessary. Paige |
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Here's some examples of both active-high and active-low switching circuits depending on how your FPGA drives the LEDs. http://www.pcbheaven.com/wikipages/Transistor_Circuits/ |
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