Hey Guys - I've got a basic project which lights 32 LEDs which are set up in series of 4 all in parallel as shown below. As each LED is 3V / 20ma, I didn't add in resistors or anything to each series. Unfortunately, I've twice now run into an issue (thermal runaway?) where the LEDs are only runni…

Preventing LED Issue (Thermal Runaway?)

sterretje October 15, 2021, 4:32am 2

You need series resistors for each string of 4 LEDs. Basically LEDs are shorts so you're shorting your circuit.

Overloading your power supply by drawing 'unlimited' current.

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