555 timer still ticking

Started by leeranya, June 04, 2009, 07:29:30 AM

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big bustle

Quote from: newfish on August 20, 2009, 05:35:17 AM
Have you tried the '7555' low current timers?

Same pin-out as a '555', but I've found them to be quieter.

Shown here as 'ICM7555IPA'... 


Very cheap too!

thanks for that link. those prices even beat ebay.

George Giblet

As an experiment, power the whole 555 and LED circuit from another power source, if it still ticks then either the LED wires or some of the 55 wiring is too close to sensitive audio lines.   if it doesn't tick then you know is power related.


Have you try to search in google maybe you can found some info that related in your topic. But I have here some info might related in your problem. Hope this can help in maybe a little idea, xxx.555-timer-circuits.com.
My Sports Timer



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