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Hi crutschow,
Yes, i see, i was wondering where/how they get these bad semiconductors, i mean, semicondunceter manufactures are no a backyard shop....it is big plants, with quality control, and i wouldthing that bad chips were destroyed already in production test even before they were placed in...
Problem solved!
I ordered excately the same ua78M33CDCY from Texas instruments......and they work perfect!......they regulate to 3,3 volt allthe way from 4 volt to 25 volt!
So.....Aliexpress sold me bad ua78M33CDCY`s.......a secondhand batch that didn`t really work.
Hi,
I only have the 560 ohm load since i thought that maybe the regulator need e little current draw, around 5 mA, to work correctly, an it does not even gets warm.
Right now when i test i, i do not have it on a pcb, just soldered together on the table.
I can live with the 11 volt in the mems...
I got a problem, i need 3,3 volt for a mems microphone test, so got some small SMD version (SOT223) UA78M33CDCY voltage regulators.
They are connected the standard way, 0,1 nF to ground on output, and 0,33 nF on DC input to ground, and i also had a 560 ohm resistor on output to ground to ensure...
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