Chief Delphi - Turning LEDs on/off

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Chief Delphi (http://www.chiefdelphi.com/forums/index.php)

- Technical Discussion (http://www.chiefdelphi.com/forums/forumdisplay.php?f=22)

- - Turning LEDs on/off (http://www.chiefdelphi.com/forums/showthread.php?t=107229)

Ether

09-07-2012 15:44

Re: Turning LEDs on/off

1 Attachment(s)

While we're on the subject of series resistors for the signal line, attached is a sketch of the circuit using one of those NPN transistors you got in the package you bought (2N3904).

Can someone please check my calculation for the base resistor?

I tried to size it to saturate the transistor with a 5V signal.

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