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Hi,Inkjet printer will not work (different kind of toner/paint, different way of printing etc.). Only laser.Etching solutions is usually available at local electric shops (where normal components are available: resistors, leds or even plain PCB boards). Note that it is not available for on-line orders in most countries due to postage restrictions.
I agree... Most "beginner" Arduino projects are simply "forget" the necessity of current limiting resistors. (Meanwhile many sources states that the lack of these are not a real risk at all.) BTW, I suggest to use 220 R (or similar) resistors on each cathode line (pins D2~D8). For the next step, a shift register may help a lot to use less pins and better coding (MAX 7221/7219 for example).
Battery operated variable bench power supply 0-20V 0-2A
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