Spare pcb's for making large 10" (250mm) high seven segment led displays. No decimal point. All you need to supply is one of the cheap Chinese max7219 matrix kits and 42 leds 10mm dia (or smaller) of your color choice to complete. I will supply documentation by email including a fairly standard Arduino sketch to get you going. The pcb is a quality Lead free black solder mask white silkscreen 1oz CU, through hole plated board. Actual board dimensions, 4 fixing positions 1/8" (3.3mm) clear, and header centres shown in the picture. Happy to answer questions.
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Experienced printed circuit board and aircraft harness design engineer. With over 25 years experience. Living in the south west United Kingdom.