USB Midi Device from old Gamepad

Step 9 Solder resistor to the LEDs (optional)

Solder a 220-Ohm to the long (positive) end of each LED. This will insure your LEDs do not burn out. Extend the other peg with a wire to connect to a ground.

Comments

[iGianlucaConidi]

I would like if i used differents led to understand that resistance should i use?
could use witouth resistance?

[cheft]

You must use resistors otherwise you will burn out the LED in no time. Look for a LED resistor calculator on the internet to determine what you need for your project.

[amplex]

different leds might need different size resistors. in practice ive found that most schematics use 4.7k resistors to protect leds but these make them too dim. but the leds i buy in general need only 270ohm or so to be brightly lit. experiment because some leds have different voltage capacities/current usage etc. this is an awesome project idea btw!!!!