Struggling with MIDI (four basic suggestions to make your circuits work)

As soon as I had the components in my hands, I was so excited that took the soldering pen and in a hurry I have mounted this:

2Midi interface soldered on perfboard

I felt lucky and I was so anxious  to have everything working in my hands, that I have mounted everything directly on a perfboard, in order to see those leds blinking. Well, don´t do something like that. It´s simply stupid. If it´s not working (which is very probable when it´s a first attempt), then what you have is a mute soldered brick in front of you, and no easy way to find the problem. Continue reading