On Wed, 21 Mar 2007 09:46:01 +1100, Kevin Brooks
wrote:

I am trying to divide a 2048 Hz clock pulse to 10.5Hz. Based on info
obtained so far, I have a CD4040 wired as follows to make the divisors
additive.

Clock into pin 10. Diodes connected to pins 9, 7, 4 and 13. The anodes
all go to reset pin 11. Pin 11 has a 1M pull-up to Vdd. According to
the data sheet, the corresponding divisors are 1, 2, 64 and 128. That
ads to 195. 2048/195=10.5, or so it would seem.

There is a nice squarewave on the scope. However, the frequency
reading at the most significant digit output (pin 13) is 16Hz.

Can someone please tell me what I am missing here?

---
Are you sure you're pulling pin 11 high? MR is positive true and
with the diode cathodes also connected to pin 11 there's no way MR
could ever go low and let the counter count..


--
JF