Seven Segment Display

[egkkman]

Hello,

Just starting my B738 build and have dropped my first clanger (first of many I am sure).

I already had a couple of phidget LED 64 cards and so bought a pile of common anode seven segment displays (SSD) for the MCP and overhead indicators and was going to buy another phidgets card.

Anyway, Alan (Coconutair) has been very helpful but has pointed out that I cannot drive SSD off a phidget card. So, I plan to use open Cockpit cards but understand they only operate common cathode SSD.

Rather than bin the SSD does anyone know if there is a way of using common anode with OC cards or converting common anode to common cathode? I have done some reading up but the answers are all to technical for me. I am willing to read and learn but my electronics knowledge is very limited and some of the forums are aimed at electronic wizards!!

Any and all help gratefully recieved.

My regards

Dave Miller

[Joe Lavery]

Hi Dave,

There is no easy way to interchange common cathode and common anode 7 segement LEDs. It would entail building a seperate circuit to fit between the OC boards and the displays. Believe me you don't want to go that route, bite the bullet and get the correct displays. You can buy them quite cheaply from
http://www.lc-led.com, they sell all types and sizes even mutiple SSD displays.

Regards
Joe

[egkkman]

Hi Joe,

Thanks for taking the time to reply.

I'll take your advice. I'll order from LC, that's where I got the common anodes from.

My regards

Dave