John, wired the cct exactly as per your schem, it works fine except it
switches thru and lights all 8 outputs, all the LED's come ON
sequentially..its not a bad thing but its supposed to reset at the 6th
LED, any suggestions as to why this is happening? it makes sense that
when output5 goes LO, it resets the /load on the '161 but it doesn't
reset it, it continues on to light output6(LED7), & output7(LED8)
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What I suspect is happening is that you have either forgotten to connect
U3-10 to U2-9 or that when DS6 is lit, the current going into U3-10 is
high enough to keep the voltage on U3-10 from falling close enough to
ground to allow U2 to load on the rising edge of the next clock. If
it's not a wiring error there are two [easy] fixes, the first being to
substitute a lower current LED for DS6, along with a higher resistance
resistor for R8. If you use something like an HLMP-4700 (Red 2mA LED)
and a 1500 ohm resistor for R8 it should work. The second fix is to
rewire the circuit so that instead of synchronously loading zeros into
the counter you asynchronously clear it. To do that, disconnect U3-10
from U2-9, disconnect U2-1 from Vcc, then connect U2-9 to Vcc and
connect U2-1 to U3-9.