Pregled vezave IR led + upornik + vir

Najprej lep pozdrav vsem,

Odločil sem se sestaviti enostavno omrežje, ki bo napajano z 9 V baterijo, in mora vsebovati 3 IR ledice tipa SFH485P s forward voltage = 1,5V in max forward current 100mA.

Priporočena vrednost forward currenta je 70mA, in to sem tudi uporabil v tem diagramu, ki sem ga našel v povezavah v tem oddelku.

Solution R = 68 ohms
The wizard says: each 68 ohm resistor dissipates 333.2 mW
the wizard thinks 1W resistors are needed for your application
together, all resistors dissipate 333.2 mW
together, the diodes dissipate 315 mW
total power dissipated by the array is 648.2 mW
the array draws current of 70 mA from the source.

A na strani, kjer sem pa dobil originalne informacije o napravi pa sem dobil naslednje:

SETUP MODEL 3 LEDS
POWER SUPPLY Power supply (V) 9 V
LED Led forward voltage (V - manufacturer info) 1,5 V
Led forward current (mA - manufacturer info) 70 mA
LED ASSEMBLY S : serial assembly
RESISTOR COUNT 1 resistor(s) needed for the complete kit
RESISTOR THEORICAL VALUE 85.71 Ohms
RESISTOR CHOICE E24 SERIES Resistor value 91 Ohms 5%

Current 65.9 mA
Dissipated power 0.4 Watts
Total current in assembly 65.9 mA

Tako, da bi lepo prosil koga z iskušnjami, da mi razsvetli zadevo in pove kateri upornik dejansko rabim.