M is for MOSFET

automatic captions, checked for structure and key terms; corrections welcome

[00:00:01.460] [unclear opening audio]
[00:00:31.560] Hi Hans, what are you doing?
[00:00:35.420] Hi Connie, well as you know I am a 555 timer IC,
[00:00:41.620] so I'm pretty good at sending out pulses
[00:00:43.920] of electricity in perfect time.
[00:00:47.040] Normally I can blink an LED just fine, but for some reason I can't make this high
[00:00:52.900] power LED flash.
[00:00:54.960] Oh, you probably just need to give it a little more electrical current.
[00:00:59.620] Hmm, you may be right. But I can only supply a bit of current from my pins here.
[00:01:05.600] My integrated circuit was not designed for driving a lot of current.
[00:01:10.260] Well, you're mighty lucky I came along. I can help you.
[00:01:14.540] Really? How?
[00:01:16.320] I may be small, but I'm pretty strong.
[00:01:20.160] I can push and pull ten times as much current as you can,
[00:01:23.700] and manage enough power to light this big LED.
[00:01:26.600] I just need you to tell me when to turn it on.
[00:01:29.820] Oh? How do I do that?
[00:01:32.020] Just grab my hand, like this.
[00:01:44.740] So now, you just keep sending electrical pulses through your output pin like you
[00:01:49.440] were doing before.
[00:01:50.520] My other pin is connected to the positive leg of the LED, and all three of us are
[00:01:55.220] connected to ground.
[00:01:56.580] Whenever you send an electrical pulse to my left pin, I'll know you want me to do
[00:02:00.820] the same on my right pin.
[00:02:02.280] What I mean to say is, when you turn your pin on, I'll turn the high power to the
[00:02:07.620] LED on.
[00:02:08.500] And when you turn your pin off, I'll turn power to the LED off.
[00:02:12.700] You ready?
[00:02:13.400] Okay, yeah. Let's give it a go.
[00:02:17.600] It's working!
[00:02:19.200] Connie, you are very strong.
[00:02:22.880] Just doing my job. I'm a MOSFET.
[00:02:26.040] You have a mossy feet. What in the wide world of sports is that?
[00:02:30.140] Oh, no, Hans, a MOSFET.
[00:02:33.980] That stands for metal oxide field effect transistor.
[00:02:37.920] I can take weak electrical signals and strengthen them.
[00:02:41.340] Those small signals can then control much larger amounts of current.
[00:02:45.340] I use three connections to make that happen.
[00:02:48.100] My source pin connects to the source electrons I want to control the flow of,
[00:02:52.320] you know, such as ground or negative connection on a power supply.
[00:02:57.540] My drain pin connects to positive power.
[00:03:00.480] And my gate pin connects to the signal,
[00:03:03.180] which tells me when to turn the higher current connection on or off.
[00:03:08.700] so you empower smaller electrical signals to make them bigger
[00:03:14.120] that's true you know some folks
[00:03:18.080] even call me an amplifier Connie the amplifying MOSFET
[00:03:23.340] sounds like a superhero thanks Hans
[00:03:27.860] well i told Cappy i'd meet him at an audio circuit around 2 30
[00:03:33.620] he wants help to make his
[00:03:35.280] stereo speaker louder. So how long do we have to flash this
[00:03:40.860] LED for? Oh, just like another 400,000
[00:03:45.040] milliseconds. So you should be fine. Oh, okay.
[00:04:13.440] I'll see you next time.