...
Conclusion: u12 is bad, and another wait for EBay starts, sigh.
After receiving the new 74S65 the trigger circuit worked (at last the parts tested so far), and with the new Tektronix 2236 oscilloscope we finally have a nice picture:
...
...
Conclusion: u12 is bad, and another wait for EBay starts, sigh.
After receiving the new 74S65 the trigger circuit worked (at last the parts tested so far), and with the new Tektronix 2236 oscilloscope we finally have a nice picture:
...