MATRIXSYNTH

Akai AX-80

via this auction

Click the images to see some of the editable paramaters. Note the illuminated values in the second shot.

Rare 1988 Ensoniq Keyboard Synth Advertising Stickers

via this auction

"2 original 1988 Ensoniq stickers. The stickers measure 8.5" x 3.5" and were used to promote the Ensoniq product line."

Squarewave Parade Teaspoon KINK version. 1

YouTube via opsysbug
"Squarewave Parade Teaspoon KINK version #2.
This one is on auto-trigger setting with live radio. An amazing pedal. This is my first 1/2 hour with it. On the otherside underneath are some touchplates to play as well. I'll be up all night !!"

Squarewave Parade Teaspoon KINK .2

4-wire touchscreen on AVR

YouTube via MusicMiK. Touchscreen interface for his MonoMiK DIY synthesizer.
You can find previous posts featuring MusicMiK here.
"I found this display at one of my usual electronics dealers - the one who specialized in selling industry surplus stuff. This display is available for 6,95 EUR, while neither the touch panel nor the EL backlight are mentioned in the offer, i just suspected the touch panel because the characteristic 4 lines going away in the photo of the offer.

The display uses an LC7981 controller, which is obsolete, but quite okay, the touch panel is a resistive 4-wire touch panel. I connected this via 4 protection resistors to an ATmega88, Port C0-C3, while the software uses those port pins as either digital outputs to provide the voltages or as analog inputs to sample the output of the panel. Quite an elegant and simple design.

Before you ask - Pollin Electronic, order number 120346. Currently, 778 are in stock, i think, the 10 units i just ordered are already substracted :)"