Electronics - Using an NPN Transistor as a Switch

This tutorial shows you how to use an NPN transistor as a switch.

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Category:

Science & Technology

Tags:

• electonics
• basics
• npn transistor
• using transistor as a switch
• basic electronics
• lordneverdie
• michael judge

[jeta45]

Great Video. Very clear quality video. Can you do one on Darlington pair circuits please. Like showing how to turn on LED's through a darlington pair by touching the base.

[michaeljudge88]

@jeta45 Thanks for watching. Also I got around to doing a Darlington pair circuit, just check out my channel to see. Thanks for watching my videos:)

[jeta45]

Excellent video explaining how to wire up an NPN Bipolar Junction transistor circuit as a switch. Seriously, I've watched many videos and this is the best to follow along with. GREAT JOB!!!

[michaeljudge88]

@jeta45 Thanks a lot:)

[directcurrent10]

wht type of transistor did you use in that circuit????

[michaeljudge88]

@directcurrent10 Just a regular 2202 or whatever, off the shelf crappy one

[FukinExplosions]

Just like a relay

[milesdavidsmith]

@milesdavidsmith Anywho

[milesdavidsmith]

@ismaels91 LOL ur dum

Plus this is the basis for all digital logic. I've sort of learned that it's best to remain silent and remain an enigma then to speak up and look like a smartass :)

[seraine22]

@ismaels91

You are correct, transistor was actually a combination of transfer and resistor. However, using transistors as a switch can actually be very useful. For example, I have a photocell that can only take a few milliamps, but a motor I'm using needs 3/4. I can use this way to make a simple(when compared to other methods) light activated motor.

[ismaels91]

Nowhere in the word transistor does it mean 3. You kinda stated it did. Anywho

Yes it is using the transistor as a switch but you are using the same power supply. All you did was make the circuit more complex. Removing the power source from the 3rd leg on the transistor made the LED turn off same as if you didnt have the transistor in the circuit.