Delayed activation of decade counter

Discussion in 'General Electronics Chat' started by Nashuan, Oct 28, 2009.

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  1. Nashuan

    Thread Starter New Member

    Oct 28, 2009
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    I'm hoping someone can help me with a small project I've been working on, but can't make progress with. I want to make a decade counter that won't turn on for 17.5 seconds. I'm interested in a design like this:

    http://delabs-circuits.com/cirdir/theory/gates/doc00020.html

    I've rigged 10 sets of 7-segment LED displays to show one digit each and want to have them flash one at a time in place of the LEDs shown in the circuit: staying on for about 1/2 second each. The circuit will be powered by 5V DC.

    I contacted the designer of the above-listed circuit and he was kind enough to suggest that I try:
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    "use chip CD4541 for the 17.5 Sec delay

    http://www.standardics.nxp.com/products/hef/datasheet/hef4541b.pdf

    http://www.fairchildsemi.com/ds/CD%2FCD4541BC.pdf

    See the drive circuit here http://www.acroname.com/robotics/info/articles/drivers/drivers.html

    http://terpconnect.umd.edu/~toh/ElectroSim/relay.html "

    ------------------------------------------


    I've purchased these CD4541 chips, but am lost in how to hook them up to the circuit. The person I contacted was nice enough to respond and try to help, but I don't want to keep bothering him. Does anyone want to try to help work this out?

    What I want is to start the circuit with a push of a switch, have a 17.5 second delay and then the numbers cycle through their sequence over and over until the source is disconnected.

    Thanks,

    Nashuan (Michael)
     
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