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2 votes

How would one identify an LED like this?

My assumptions from inspection are; 5V input 3.5mm x 2.8 mm 18 ohms implies if 3.1V 5-3.1=1.9V then / 18 Ohms = 105 mA for a part rated @ 150 mA means Cu PCB will get hot but not burning hot. Warm ...
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2 votes

What's the difference between these two circuits? They both work

Remember, all voltage is measured between TWO points. It is impossible to measure the voltage at one point in the circuit so if the two points that the voltage is being measured across is not explicit ...
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1 vote

Problem with LED lamp PCB

Sometimes we don't have enough information to solve your problem. The next best thing, then, would be how to get more information. So, my thoughts, in order, are... Find a way to stop destroying the ...
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1 vote

How would one identify an LED like this?

It looks like a 2835 size which several manufactures make. The problem is, some are anode left side and some are anode right side so just make,sure you get the one you need. Cree, Samsung have the ...
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1 vote

What's the difference between these two circuits? They both work

As others have mentioned, your voltages are more typical of a small silicon diode than an LED. Circuitlab simulation below: simulate this circuit – Schematic created using CircuitLab The LTL-...
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1 vote

What's the difference between these two circuits? They both work

The only difference is the order of the resistors and LEDs. Look at just one of the resistor/LED pairs. The supply voltage, 6.0 V, causes a current to flow through them. The current is determined by ...
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