Top Definition
Part of a circuit formed with a unijunction transistor and a capacitor. It creates a triangle wave and can be used as a timer instead of a 555 timer.

Why exactly you would look up this "smart" thing on urban dictionary is a long mystery.
He used a Unijunction Transistor relaxation Oscillator to create a flashing light to annoy his friends while they slept.
by zbx March 04, 2012

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