Go Down

Topic: creating large LED sign (Read 1 time) previous topic - next topic

distorteddisco

Okay perfect.

Well, math tells me that the average current by the entire array will be 400 mA (4 LEDs in each string, 20 strings).

By the way, I'm in Victoria, Canada.  I'll update the profile, heh.

Thanks.

distorteddisco

#6
Jan 18, 2011, 08:14 pm Last Edit: Jan 18, 2011, 08:15 pm by smocksturr Reason: 1
Bump for help on this.

Can anyone help me calculate the base resistor voltage for a transistor with collecter current ~400mA?

edit:datasheet:

http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00001984.pdf

Go Up