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LED Heart Breathing Effect work by 3.7 volt ⫽ using IC NE555 and BC557 PNP Transistor
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Você nunca viu isso antes, ótima ideia PC817
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LED Flip Flop With Speed Controller Using one transistor
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DIY Raindrop LED Lights Using 74HC595 And NE555 ICs
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Como fazer o medidor VU sem ic, sem transistores, sem PCB
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