Divide by N parallelling diodes

Mar 20, 2007 3 Replies

I am using a CD4040 to divide down a clock frequency. I would like to connect several outputs in parallel with diodes to make their divisors additive. The output is then between their common and a 1M pull-up resistor.



I have tried everything I can think of to make this work. I am tying reset to ground, but something tells me this is not right. What I get doing this is a pulse train, with each pulse less than 50% duty cycle.



Unable to find anything online. Can somebody tell me the proper way?



Thank you,



Kevin Brooks


Put a pullup on the reset and connect diodes, anode to reset, to the outputs. Use 2nd MSB as output.

That scheme cannot possibly work. Get a sheet of graph paper and draw a number of signal lines; the first being the (clock) data input line and the others erpresenting the outputs of interest. Use the datasheet for help.

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