Ir blaster current doesn't work correctly

Projects General Guidance
42

If the voltage across resistors really is 3.8V , (not 0.38V), it's not backwards.

43

By across resistors, you mean one probe of the multimeter before the first resistor and the second probe after the second resistor?

44

Yes. I also posted image earlier.

45

It’s 3.08v for some reason

46

And before it was 3.8V?
Measure all voltages:
Supply voltage, across resistors, across LED and across collector-emitter.

47

Yes for some reason it was. I think it is because of the overall load since i'm powering it through usb so the supply voltage is kind of jumping around(close to 4.5 on the 5v pin). Across the 2 18ohm resistors it is 3.05v. 1.36 volts across the ir led. Collector to gnd is 0.12v and connector to emmitter is 0.12v

48

They don't always mark the complete part number sometimes it will just have 2222A

49

Yet you say there is no IR comming out?
Are you sure it is a TSAL6100?

50

If you had stable 5V, it should be ~3.7V across resistors and ~1.2V across LED and ~0.1V across C-E.
LED voltage 1.36 is high, maybe damaged, maybe not Vishay LED.

51

After the measurements the pinout seems to be EBC though

52

The product description said tsal6100 so I would hope so

53

Maybe you should start from the beginning and test the transistor with a RED LED and see if the RED LED will light. You will need a larger value resistor 220 would be OK

54

Resoldered a new led, still the same 3.05 v

55

I don't understand why don't you double up the LED resistor value for safe debugging.
Together with new LED it would take odds out of that part.

Also, find a supply for stabile 5V.

56

So make the led anode resistor 72 ohms?

57

Made a 235ohm resistor, the red led worked fine and the voltage across the resistors was 2.52 volts

58

sadly the only 2 things I can use as power supplies are the usb and a 4.2v battery

59

I not sure whats going on. All I can say is connect the IR LED with the 235 ohm resistor and just 5V and ground, no transistor and see if it's visable on the phone.

60

I use may mobile camera to see IR emission.
The mobile camera is IR sensitive.
Look your IR with your mobile camera to see if something TSAl6000 is being emitted.

61

I tried with both a normal and an ir led, 235ohm on the anode, both led's didn't work