- Feb 21, 2016
About testing the "continuity" or short-testing using multimeter:
You need to be aware as the (usual) multimeter will supply about 3V when set into continuity test. This leads into powering up the driver and thus act the same way when you power it up using 3V battery, i.e the output voltage will go up and up until the IC dead (if there is no load at output)
Luckily, if you are using pretty good DMM, it will limit the current to the probe, so the driver will not draw high current (which will translate to big duty cycle or big Vout/Vin)
About the defective drivers, it seems the one that is defective is the capacitor. But i don't know for sure as i'm unable to reproduce/find the issue here.
I have also a customer in ebay reported two of five driver are defective, but he said after desoldering again and again, one of two defective is finally working.
The other defective one is drawing high current while giving no output. It seems he doesn't have multimeter as he don't know wheter the input or output which is shorted.
Apparently doing random testing is not enough i guess :yabbem:
i really apreciate your honesty,you even mentioned a report of an ebay user, the defective that is drawing high current while giving no output seems exactly like my case with the shorted capacitor.
i just read about the new Superdrive on the other thread,hope it will not take that long to release the package