Pages: 1 [2]   Go Down
Author Topic: Transistors and Resistors  (Read 1413 times)
0 Members and 1 Guest are viewing this topic.
Valencia, Spain
Offline Offline
Faraday Member
Karma: 152
Posts: 5760
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

On a side note - i thought arduino could supply 40ma through the output pins not 20ma as Henry_Best said? And up to an Amp (although i wouldn't) out of the 5v pin?

40mA is absolute maximum, not recommended for daily use.

Also what resistor should i have between the 5v arduino output and the led to stop it drawing more than 350ma? That is the real question for me!!!

The LED needs 1.4V, the resistor therefore has to dissipate the other 3.6V. Use Ohms law.

No, I don't answer questions sent in private messages (but I do accept thank-you notes...)

Offline Offline
Karma: 0
Posts: 17
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset


Global Moderator
Melbourne, Australia
Offline Offline
Brattain Member
Karma: 511
Posts: 19367
Lua rocks!
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

LED calculator

Please post technical questions on the forum - not to me by personal message. Thanks a lot.

Pages: 1 [2]   Go Up
Jump to: