Bought a cheap PWM controller for a 24VDC motor off of Ebay for some $10.
Besides an design that is either amateurish or intentionally over-robust (i .e. using components that are way oversized for the job, heatsinking some 1
0x what the power dissipation might ever be, etc.); the funniest part was t hat it obviously was built around a 555 timer chip to generate the PWM, and they...went to the trouble of embossing the markings off of the 555, for who knows what reason!
Or perhaps it was actually built around ATtiny13 or PIC12F609 or another 8-pin MCU that looks just like a 555 timer, especially if you remove the markings... Perhaps they felt it worth their efforts to delay you from copying the device in its exact form for a day or two? And most likely this device is already an exact copy of someone else's device and they just didn't want it to look quite that obvious.
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