I want to control a "matrix" of LEDs with a BJT, from a microcontroller.
I have attached the schematic as a pdf.
I know that I need 114.7mA to go to the LED matrix, and I know that:
Ic = B*Ib
So if I want 115mA at Ic, and assuming a Beta of 100 (should I assume B=100???) then Ib = 1.15ma, and I would need a resitor value = V/I = 3.3V/1.15ma = 2.87K.
Is this correct?
Is 1.15Ma going to be enough to turn a BJT on?
Thanks in advance!
I have attached the schematic as a pdf.
I know that I need 114.7mA to go to the LED matrix, and I know that:
Ic = B*Ib
So if I want 115mA at Ic, and assuming a Beta of 100 (should I assume B=100???) then Ib = 1.15ma, and I would need a resitor value = V/I = 3.3V/1.15ma = 2.87K.
Is this correct?
Is 1.15Ma going to be enough to turn a BJT on?
Thanks in advance!
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