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Pullup or current limiting

W

Wong

Jan 1, 1970
0
Hi,
If a 5V source is connect to a resistor, then a LED, then to the
collector of a transistor, in series connection.
I guess this must be a current-limiting-resistor, right ?
 
B

Bernhard Roessmann

Jan 1, 1970
0
Wong said:
Hi,
If a 5V source is connect to a resistor, then a LED, then to the
collector of a transistor, in series connection.
I guess this must be a current-limiting-resistor, right ?

Yes.


Regards,
 
E

ETC Mitchell

Jan 1, 1970
0
Hi,
If a 5V source is connect to a resistor, then a LED, then to the
collector of a transistor, in series connection.
I guess this must be a current-limiting-resistor, right ?

Definitely. Most LED's require a minimum of 10 mA of current and a
maximum of 20 mA of current to operate. Anything less than 10 mA will
be too dim to see, and anything above 20mA with damage the LED.
 
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