Nov 10, 2006 #1 D desperado1 Full Member level 3 Joined Sep 4, 2006 Messages 189 Helped 8 Reputation 16 Reaction score 2 Trophy points 1,298 Activity points 2,503 I want to connect four BS-CD46RD which are 57mm common cathode LED from Yellow Stone Corp. Supply voltage is intended to be 9 volt DC but I do not know what value resistors to use.
I want to connect four BS-CD46RD which are 57mm common cathode LED from Yellow Stone Corp. Supply voltage is intended to be 9 volt DC but I do not know what value resistors to use.
Nov 10, 2006 #2 I IanP Advanced Member level 7 Joined Oct 5, 2004 Messages 7,929 Helped 2,311 Reputation 4,624 Reaction score 531 Trophy points 1,393 Location West Coast Activity points 66,416 For static application try something around 300Ω .. This will limit the LEDs' current to ≈20mA .. If you intend to implement "sequential" display, divide this by 4 =>75Ω, as you have 4 segments .. Regards, IanP
For static application try something around 300Ω .. This will limit the LEDs' current to ≈20mA .. If you intend to implement "sequential" display, divide this by 4 =>75Ω, as you have 4 segments .. Regards, IanP
Nov 12, 2006 #3 A ajaykumar988 Member level 5 Joined May 7, 2006 Messages 86 Helped 11 Reputation 22 Reaction score 3 Trophy points 1,288 Activity points 1,796 Firstly you need to determine the current required for each and place the appropriate resistors according to the data sheet.
Firstly you need to determine the current required for each and place the appropriate resistors according to the data sheet.