[SOLVED] Am I bouncing the clock on my shift register?

[InsertCoffee]

Hi,

I'm 'getting to know' a shift register (8 bit serial in, parallel out) before connecting it to my PIC, by putting it in a breadboard with LEDs and trying to send it data using jumpleads.
I get a problem where all off the LEDs are either on or off, and I'm wondering if thats because of signal bounce when I insert the 'clock' jump lead. Maybe it's getting loads of clock signals when I only intended to send on pulse. Does that sound likely?

 

[Kurenai_ryu]

U R right!

if you are using a push button or a spdp switch as clock you certainly havo noise in your clock input... i think you already simulated your circuit and it worked on sym but on the real stuff it just goes from all ON to OFF very quickly... right??

try using a de-bouncing circuit.... ialways used the http://www.ee.nmt.edu/~elosery/fall_2009/ee231L/lab6.pdf (pag.3) SRlatch debouncer... (it never failed me!) but you can find more solutions for you... (on google of course!)

it´s only neccesary for the clock input... not for all inputs...

 

[InsertCoffee]

Cool, maybe I'm getting the hang of this. Good extra info too. Thanks