k7elp60
Active Member
This is the schematic and a picture of the project I built that uses a number of LED's from a CR2450 battery. I connect a number of LED's in parallel. To do this I match thieir Vf with a constant current source. The constant current source is about 3 to 4 Ma.
Each letter all the LED's are in parallel, with one current limiting resistor per letter.
I use a LT1054 to boost the 3V battery to about 5V because the blue LED's are over 3V.
Each letter all the LED's are in parallel, with one current limiting resistor per letter.
I use a LT1054 to boost the 3V battery to about 5V because the blue LED's are over 3V.