KITT Voice Box Vu-Meter with LM3915

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Electric diagram at 1:05
Audio Signal Transformer: 167-TTC

WARNING: Video is for demonstration purposes only, i do not take any responsibility for damage to things, people or animals.

#KnightRider #Electronic #VuMeter
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Could you explain the BJT purpose? It looks like they will go into saturation mode and the 12V supply will be brought from the emitter to the collector, which will bring 12V to the LED's. Red LED has about 2V forward, so 12-2 = 10V/180ohms = 55.5mA. Wouldn't that blow the LED's? Generally they need 20mA for Red. I think I am misunderstanding what the transistors are doing, thanks!

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