Simple NPN Led circuit

116

01:17:06

Saturated NPN with LED

published 1 year ago

knutselsmurf

1 year ago

LED voltages and currents ------------------------------------------- Red: 1,8 – 2,2 V, 10 – 20 mA Orange: 2,0 – 2,2 V, 10 – 20 mA Yellow: 2,1 – 2,3 V, 10 – 20 mA Green: 2,0 – 3,2 V, 10 – 20 mA Blue: 3,0 – 3,6 V, 10 – 20 mA White: 3,0 – 3,6 V, 10 – 20 mA UV: 3,3 – 3,8 V, 10 – 20 mA Infrared: 1,2 – 1,4 V, 10 – 20 mA

knutselsmurf

1 year ago

I_B = I_C / (saturation factor): I_B = 15mA / 10 = 1,5mA

knutselsmurf

1 year ago

R_B = (V_IN - V_BE) / I_B V_BE = 0,7 (silicon transistors)

knutselsmurf

1 year ago

R_B = (12 V − 0,7 V) / 0,0015 A = 11,3 V / 0,0015 A ≈ 7.533 Ω

knutselsmurf

1 year ago

R_LED = (12 V − 2,0 V − 0,7 V) / 0,015 A = (9,3 V) / 0,015 A = 620 Ω

jbasanth

1 year ago

You can use The LED before the collector, like +Vcc, Led then Collector of Transistor, it will be more easy and simple to calculate

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