The ER-301 is a voltage-controllable canvas for digital signal processing algorithms.
http://www.orthogonaldevices.com/er-301
If you had an Unicorn Account you could see a chart with the price development of this module and the average price asked for this module.
This ER-301 has the rev10 pcb which includes the i2c connections and removed 5v switch. It was purchased new in 2020. Some light smudges on the acrylic screens but they aren’t visible when the module is on
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