Monostable IC 555 Circuit

Thread Starter

vick5821

Joined Jan 27, 2012
54
Hey friends, recently I have built a 555 monostable circuit.It works fine.However, the circuit will lights up if I shake the circuit and off after some period of time.I didnt press the trigger button.

Anyone knows what happened ?

The connection I think is ok since it works.

Thank you
 

PaulEE

Joined Dec 23, 2011
423
Hey friends, recently I have built a 555 monostable circuit.It works fine.However, the circuit will lights up if I shake the circuit and off after some period of time.I didnt press the trigger button.

Anyone knows what happened ?

The connection I think is ok since it works.

Thank you
Do you have all capacitors in place? Power supply bypass? Is the timer snug in it's socket? Are you triggering it by touching any of the exposed conductors?

Just some thoughts.
 

Thread Starter

vick5821

Joined Jan 27, 2012
54
Do you have all capacitors in place? Power supply bypass? Is the timer snug in it's socket? Are you triggering it by touching any of the exposed conductors?

Just some thoughts.
Oh yes..I forgot to put the capacitor when took this picture.I will put them in the female header socket..Yes, it will being triggered if I touch the back side of the donut board
 
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