4027 toggle

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Discussion in 'General Electronics Chat' started by richbrune, Apr 4, 2008.

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Apr 4, 2008 #1

richbrune Thread Starter Senior Member

Oct 28, 2005

106

0

I'm trying to set up a toggle output with simply a cd4027BE, 12volt supply. I've got J and K tied to 12 volt, set and reset grounded, and the button between the clock and +12v. I'm having trouble and I think it's because I need some kind of resistors in the circuit.

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Apr 4, 2008 #2

beenthere Retired Moderator

Apr 20, 2004

15,815

286

You put your post on an expired thread. That's a good way to have it ignored.

Is your button debounced?

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Apr 4, 2008 #3

richbrune Thread Starter Senior Member

Oct 28, 2005

106

0

Nope. is a 555 the easiest way?

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Apr 5, 2008 #4

Wendy Moderator

Mar 24, 2008

20,877

2,655

Here are some various debounce schemes, it doesn't need to be that complex.

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Apr 5, 2008 #5

SgtWookie Expert

Jul 17, 2007

22,189

1,748

Don't forget that the 4027 has TWO flip flops! You must have ALL unused inputs of a 4000 series CMOS IC tied to either Vdd or Vss, or your IC may oscillate unpredictably and overheat.
You can connect them directly (hard-wired), or through a resistor - but they must not be allowed to "float".

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