(first of all sorry for bad grammar -_-)
Hello, recently i made a handmade SSD display which works with 5 LEDs in parallel for each segment.
i tried to run it with Arduino Pro Mini.
the problem was that the LEDs were not bright enough so i measured the output voltage of transistors (Emitter voltage with GND) and it was about 2 volts while i expecting 12 volts.
the transistors are 2n2222 (actually mmbt2222 the SMDpackage of that) and base resistor is 1k ohm.
can you please help me to find out why the voltage is so low in output or another way to use this SSD display?
- –>The SSD is common cathode
—> Each segment Schematic.
—> The Data + and Data - (how transistors are connected).
—> Its how the 4 SSDs are connected together.