Transistor and LED Questions

[SpeakerFreak95]

I could use the circuit that you constructed as a level indicator in audio....that would be cool.

[AllAmericanFiveRadio]

Thanks SpeakerFreak95

I'll look around for some examples, but right now I have none. Also ask cassettemaster he may have some diagram from some of his cassette recorder. Another place I would check would be Radio Shack, I'll look on there website too.

[SpeakerFreak95]

@AllAmericanFiveRadio ok....

[BadChizzle]

Oh, that's too bad. I'm gonna try anyway, cause I'm crazy like that! Lol. I've been known to do things people say can't be done.

From catching fish with a cottage cheese container, to using a cassette deck as a guitar amp in a studio. I'm all about gettin it done with what you've got! And it's more fun that way!

But thanks for your answer,

Chuck

[BadChizzle]

Hey Rick,

Quik question. Can you make a transistor using diodes?

[AllAmericanFiveRadio]

No, the junctions between the N and P materials has to be grown.

[HD7100]

Very nice and instructive video. Thanks! Gary

[AllAmericanFiveRadio]

Thanks.

[UserIsAnFBIAgent]

Well Thank You Very Much for the new video on transistors and LEDS, and how exactly to hook them up so that they amplify the voltage.

Thank You.

[AllAmericanFiveRadio]

Keep experimenting, it is interest and it is the fastest way to learn.

[RadioDude1969]

Hi

In the end of the video; wouldn't you be able to adjust the brightness of the LED with the 100 k potensiometer and the resistors alone? I can't figure out the purpose of the NPN in the circuit. I might be a little slow here...

Regards

Jon

[AllAmericanFiveRadio]

Hey Jon,

Sure. The 1k resistor obviously limits the positive voltage to the base. Without the 1k the 100k potentiometer could be turned down to only a few Ohms from the positive supply to the base of the transistor. This situation could damager the transistor, it many draw to much current and burn out. That is what the 1k resistor prevents.

Regards,

Rick

[AllAmericanFiveRadio]

The purpose of the circuit is to show that the base controls the resistance between emitter and the collector of the transistor.

[mig189189189]

Nice work!

[AllAmericanFiveRadio]

Thanks!

[joernone]

Rick,

Thank you. I thought that was a pretty slick demo. Hats off to you, my friend.

Regards,

John

[AllAmericanFiveRadio]

Thanks John.

[vwest7ife]

NPN = the arrow is Not Pointing iN... that's how I remember it!

[AllAmericanFiveRadio]

Excellent way to remember it.

[falcon02012]

what program do you use to make this presentation ?

[AllAmericanFiveRadio]

This time I used FreeHand, PhotoShop and Premiere