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Problem in jk flip flop

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Harish Achar

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I am using a '7476' jk flip flop in one of my circuit.
And pin details is given below,
J=K=PRE=CLR=VCC=1
GND=0
Clock is initially high and whenever I send a high to low signal to CLOCK using a tact switch, the values of Q must toggle between 0 and 1 (AS PER THE TT)
But the problem is Q need 2 or more clock pulses to toggle, sometimes one pulse is enough, I dont know the reason, anyone know the answers pls suggest me.
 

Don't you mean you are using a mechanical switch?
It may produce a number of glitches (fast on-off transitions during a few milliseconds). The clock pulse should be clean and fast; one hi-low signal then one lo-hi only.
For instance, is the TTL series of your flip flop very old? I mean, is its name exactly 7476?
 
Your circuit is true, but your switch does not work correct. when yo u push the switch, it is On and Off and On and Off repeatedly. so your JK Flip_Flop acts for several times and you can not predicts the state of it.
 
hamidrezakarami said:
Your circuit is true, but your switch does not work correct. when yo u push the switch, it is On and Off and On and Off repeatedly. so your JK Flip_Flop acts for several times and you can not predicts the state of it.
Click to expand...

Yes I got it. for my application I need a toggle output when i press a tact switch. Do u have any ideas?
 

For instance and just to be sure, is it 7476 exactly or perhaps 74LS76 for example?
 

Harish Achar said:
Yes I got it. for my application I need a toggle output when i press a tact switch. Do u have any ideas?
Click to expand...

Yes, You can use a simple logic circuit composed of for NANDs or for NORs for eliminating the repeatedly on/off.

9989567000_1357415081.gif
 

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