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I'm planning on repurposing some lighted switches for a control surface. Unfortunately, the builtin lamp-sockets have only two leads, and I'd like to install bicolor LEDs.
Would it be possible to redesign the peggy circuit to run the LED drivers as both sink and source (probably adding some logic to prevent two transistors on the same row from being open at the same time)? Even if it requires a more expensive LED driver chip, the amount needed would be halved.