Build the transmitter

24문장 100% 한국어 번역 10명 참여 출처 : 칸아카데미
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Build the transmitter발음듣기

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[Voiceover] Now we have to build our light transmitter.발음듣기

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It's gonna take the electrical signal from the radio and turn it into a time-varying light signal. So, here's the circuit diagram.발음듣기

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We have the radio, and it has two leads coming from it. Let me show you that.발음듣기

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So, here's the radio and here is, once again, the mono phono plug.발음듣기

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It's got the one band on it.발음듣기

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It will just work with anything you plug it into.발음듣기

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So, I'll plug that into the radio.발음듣기

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And that goes to two leads, which will connect to the rest of our circuit.발음듣기

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Now, in that circuit, there's going to be a nine-volt battery, which has a positive and a negative side, and a 470-ohm resistor.발음듣기

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If I don't have that 470-ohm resistor, when I connect the nine-volt battery to my light-emitting diode, the light-emitting diode will burn out instantly. So, we need that resistor.발음듣기

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Now, the nine-volt battery snaps into this battery holder.발음듣기

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(chuckles) I use Velcro to hold it in place on my breadboard.발음듣기

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The battery holder is color-coded.발음듣기

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The positive terminal of the battery goes into the red lead on the battery holder.발음듣기

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So, this red lead is the positive terminal and it goes out and it connects to one side to one side of the light-emitting diode.발음듣기

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The black lead goes to the other side of the light-emitting diode.발음듣기

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Now, my switch is simply an alligator clip that I clip to a bent paper clip.발음듣기

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That's how I turned my light-emitting diode on and off.발음듣기

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Now, there's a little bit of a trickiness about light-emitting diodes.발음듣기

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A light-emitting diode has two legs to it, a long leg and a short leg.발음듣기

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The longer leg must be connected to the positive terminal of the battery to make the light-emitting diode glow.발음듣기

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So, when I mounted my... light-emitting diode to my circuit, I made sure the longer leg went to the red lead on the battery.발음듣기

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Now, what's going on here is that electrons are actually leaving the negative terminal of the battery, going to the black wire, going to the short lead of the light-emitting diode, and they come in with the full nine volts, very high energy, and they drop their energy and turn it into light, and then the electrons with lower energy continue around, back into the battery.발음듣기

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