June 19, 2012 at 11:28 pm #20725
In response to your suggestions:
- The base pin of Q1 (left-most) is not connected to anything nearby (except RB1) that I can detect using the continuity function on my multimeter.
- The other end of RB1 is connected to pin 3 of U2, and only pin 3. Definitely not connected to pins 2 or 20.
- Forgive me, but I’m not sure I understand what “low-voltage position” means. I am not sure how to test this.
I discovered one other interesting thing using my multimeter: the positive pin of every LED in row 1 is in continuity with the emitter pin (right-most) of EVERY transistor. Does this mean I have a problem “downstream” of the transistor, or could the issue still be with the transistor? Thanks!