Hi,

I'm in the process of drawing up the schematics of my next project, a preamp. I'd like to be able to see the selected input on the front panel and decided to use Multimec switches (http://www.mec.dk/billeder/8_619.jpg).

Because the preamp will have a tape loop output, I need to be able to see that as well on the front panel. I think bi-color leds (the ones with 2 pins, not those with 3, since they won't fit the switches) are the best for that.

The problem is that I can't figure out how to connect those 8 bi-color leds to a shift register. Is it possible to connect 8 bi-color leds to an 8-bit shift register and control all of them? I need to be able to turn them all on independently, but there never won't be more than 1 green & 1 red lighted (in case I use red/green bi-color ones of course). Is there any kind of matrix-style connection possible for this or do I have to resort to a 16-bit shift register? Note the fact that I need to light 1 green & 1 red led at the same time, so usual matrix arangements won't work.

Regards, Anthony Van Herrewege


Website: http://members.lycos.nl/anthonyvh


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