Hi sorry this is probably really basic stuff for you guys I have 3d printed a design and want to light it with some 3mm leds I have seen with a forward voltage of 3.3v , forward current 30MA , reverse voltage 5v, would like to use 24 of these but do not know how to carry this out power source , resistors needed , series or parrellel wiring ect ect
Please could someone help.
Regards David
Hi David, for my magnifier lamp I put 3 LEDs in series with a resistor and then had 8 of those in parallel using a simple regulated 12v supply.
https://www.element14.com/community/message/154612/l/re-magnification#154612
Volt Drop across resistor (Vr) = Supply voltage - 3 x LED forward voltage
R = V/I = Vr / 30mA
Then round up to find the result that's closest to a standard value resistor.
Here's a web page that does the calculation for you.
Hi David, for my magnifier lamp I put 3 LEDs in series with a resistor and then had 8 of those in parallel using a simple regulated 12v supply.
https://www.element14.com/community/message/154612/l/re-magnification#154612
Volt Drop across resistor (Vr) = Supply voltage - 3 x LED forward voltage
R = V/I = Vr / 30mA
Then round up to find the result that's closest to a standard value resistor.
Here's a web page that does the calculation for you.
