How about the input conditions for the
4013?
D/9 = 5V
C/11 = 5V, goes to 0V with push of INPUT switch
R/10 = 0V (pulses to 5V for uSecs via 1802 after release of INPUT switch)
Keeping in mind the output (nQ) of the 4013 will only change (go to 0V)
for a few microseconds.
This bit helped a lot to understand what's going on. Took out the 4013 and
tested it on a separate breadboard, worked fine. Put it back and still
cannot see anything on pin 12 (*Q*). Tested all the conditions over and
over and seems that SC1 does not change after the input button is pressed.
On the other hand, if I set the DMA IN pin low, SC1 goes high. Created a
somewhat amateurish
diagram<https://picasaweb.google.com/lh/photo/r9_0Sc3OKIxotL1IU5hk3dMTjN…nk>,
green means tested and working, red means doesn't work. I wonder what N2
does. It never seem to change from low state. Thank you for your help in
advance!
Greg Lorincz