Few days ago I received one ringo3 PCB from forum member matseng. It's having 60+60+12 LEDs (ss,mm,hh). The board design is nice as you can see in
Now, I've gathered most components of it, and I soldered it in about 2 hours (I should have checked those LEDs before soldering, I found 8 LEDs to be dead and had to replace them).
Since this is multiplexed matrix, we cannot have individual control over all of the LEDs at the same time. I need to fast switch between rows (as in schematics), or can have other ideas(give me ideas).
I used some 0603 caps in place because I had 22pf only in 0603 and 1206.
Now I have to add the resistors (100Ohms should be OK) and MOSFETs. MOSFETs from china(ebay) haven't reached me yet. I guess I will install some NPN like BC548 in place of the N-ch mosfets if it takes too much time to arrive.