Electronics > Beginners

I keep killing mosfets - what I do wrong?

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PMA:
I think that the resistor is needed for reverse battery protection (page 9). So it would be good to have, but not mandatory.

According to page 13 (right side) and page  6 (bottom), typical current is only 1mA or so.

Jwillis:

--- Quote from: PMA on September 29, 2019, 05:38:47 am ---I think that the resistor is needed for reverse battery protection (page 9). So it would be good to have, but not mandatory.

According to page 13 (right side) and page  6 (bottom), typical current is only 1mA or so.

--- End quote ---

Ok but that mosfet is pulling current from some where. Could always check to see how much current is being drawn with a ammeter. If it more than a milliamp then that chip might be faulty.

PMA:
That is a good advice.

However, the problem is already solved. My soldering iron was in ungrounded outlet which caused large potential difference between grounded PCB and tip of the iron.

Jwillis:
Thanks Ian.
Something we all should take into consideration how lucky many of us have been with the old wood burners we've been using.
The BTS555 is a class 3 Military spec (4,000 volts and above)ESD device  .When you consider that some of the commonly use op amps like the TL082 are a mere class 1( 0 volt to 1,999 volts) or the 555 timer of a mere 500V .

Yansi:
and btw, when will people learn, that  ZENER diodes are UNUSABLE as analog input protection?

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