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Who can help a newbie connect four 7 segment leds?

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desperado1

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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.
 

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
 

Firstly you need to determine the current required for each and place the appropriate resistors according to the data sheet.
 

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