Stopping Timer function on 555? Pin removal?

Thread Starter


Joined Jan 27, 2020
trying to stop the 3 minute timer on an ultra sonic cleaner of mine. I removed pin 4 thinking that would reset the timer but all it did was disable the OFF button. Any advice on how to completely stop the timer all together? Possibly a jumper?


Joined Aug 1, 2013
Is the timer circuit part of a purchased product, or did you build it from scratch, or something else? What you have done so far still is not clear. Can you post a schematic of the timer circuit, or photos of the pc board?



Joined Jun 4, 2014
If you want the cleaner to run for longer than three minutes then leave pin 4 as it was and connect pin 6 to ground. This way the timed on period will never end but the off button will still work.