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The layout could be mirrored. And perhaps there are more variants of the 555.
Yeah! Rockon! :)
Because these circuits depend on a 555 timer to enable the PWM. So the 555 may not have a nice logo or other markings on it. But it can not hide itself :) The other components are clearly no 555 timer. I'm 99% sure it is a kind of 555.
Arduino Highpower PWM (dimm...View Instructable »
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