Low voltages lighting LEDs without resistor experiment

LEDs depend on resistors to protect them. However, if a low enough voltage is carefully applied to an LED, then it will limit current on it’s own.  Therefore, I made the following video where I experimented with lighting resistor-less LEDs, while using my highly programmable portable power supply.

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Since LEDs are a diode, they conduct easily while forward biased, and not so easily while reverse biased. However, even while forward biased, diodes block a certain voltage that varies a little bit based on how much current is passing through them. The voltage that a forward biased diode/LED blocks is called it’s forward voltage.

Video demonstration:

Testing LED forward voltages without a resistor using portable power supply display


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