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4029 counter

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bogdanfirst

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how can i make the 4029 counter in the binary mode count from 0001 to 0111, or at least make it count from 0000 to 0111?
 

bogdanfirst

New Member
yes, i know that this way you make it count
the problem is that it counts from 0 to 15...right?
well iwant it to count from 1 to 7........in binary
that is the problem.........but i dont know the solution
 

pebe

Member
You mean you *ONLY* want it to count to 7? OK.

Wire all jam inputs low. Connect Q4 to via a diode to PE (pin1), (anode to Q4). From PE connect a 1n cap to Vdd and a 100k resistor to ground. That ensures count starts at 0 at switch-on.

At start, the 1n cap is discharged and pulls PE high. That transfers the jam inputs (0000) to the count. 1n charges through the 100k and takes RE low.
So under any circumstances, the count will start at 0.

Clock pulses will then count to a maximum of 7 (0111). The next clock pulse will take the count to 8 (1000) and Q4 will go high. That will take PE high via the diode and the counter will again be reset to 0 by the jam inputs.

I assume you want it the count to rotate to 1 after 7. If not and you want it to stay at 7, then take Q4 to CLEN instead of PE. that will inhibit further clocking.

I hope that helps.
 

bogdanfirst

New Member
well your solution is good.
but i have adapted the circuit to what i need. so i just take q1, q2, q3 instead of the first 3 outputs. i can do this because the clock is from an oscilator and i can double the frequency.
and about the counterstarting from 1 not 0 , i figred that it is not strictly necessary.
thanks for your help anyway!
i apreciate it!
 
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