smarty2012

modified 6 years ago

How to use NPN and PNP transistor with switch

290

08:15:28

Hello friends  here I have tried to illustrate how to use the NPN and PNP with switch to glow a led. This basic circuit will give you an idea of how the current flow in NPN and PNP transistor. 
Have a look yourself just click on the switch to make the led On-Off and notice the flow of current.
Have fun

published 7 years ago

hurz

7 years ago

Check the base current, its much to high and will kill the transistors. Limit the base current with resistors e.g. 10kOhm, but also check the collector current, cuz with base resistors you are not driving the transistor in super saturation as it is now.

lenzrulz

7 years ago

Here are some examples: http://everycircuit.com/circuit/6056783540387840

hurz

7 years ago

Lenny and its ridiculous examples. Both left ones are a mix of common emitter and/or common collector (nobody included Lenny knows what it is), while both right examples are completly bullshit, while the transistor are used as diode and just drop some voltage. Total nonsense!

smarty2012

7 years ago

Thanks @hurz now the circuit outputs results are good and thanks for pointing out the mistake.

hurz

7 years ago

You are welcome!

BillyT

7 years ago

Good work. Now if you put a current trace on your power supplies, you will notice that there is still current being used when the led is not being lit. This is easily fixed by turning the transistor completely off, check out these circuits to see how this is done. http://everycircuit.com/circuit/4516329280503808

lenzrulz

7 years ago

Not sure who “Lenny” is, anyway there are in excess of 1 million EC community members who’s collective knowledge surpasses any individual member, which probably deflates certain members who egotistically think they are the personification of EC. What’s particularly noteworthy is that 99.9% EC community members never hide their circuits...🤔

hurz

7 years ago

1Million, I think you overestimate that by a factor of 1000 or even 10000 my little troll Lenny.

smarty2012

7 years ago

Hey BillyT I saw your circuit using pnp and npn it was good but you are using both of them in the same circuit correct, is their any solution so that we use npn and pnp individually to switch the led. Means I want 2 different circuit one with npn and other with pnp without the loss of current when they are off, I think you are getting what I mean to say.😇

lenzrulz

7 years ago

I don’t overestimate the fact that 99.9% of EC community members don’t hide their circuits Warner...🤔

hurz

7 years ago

0.1% from 1Million, as you said, are 1000 users who keep there circuits hidden. So try to be a little more precise my little troll friend Lenny.

lenzrulz

7 years ago

Au contraire Warner, the figure is much less because you believe that I overestimate by a factor of 1000 or even 10000...😂

BillyT

7 years ago

@smarty2012, there are many ways transistors can be used. Those two are common collector or (voltage amplifier configuration), another way is a common emitter (current amplifier configuration) a circuit that uses both an npn and a pnp is at http://everycircuit.com/circuit/5539459209887744

hurz

7 years ago

Troll Lenny, its your math you have started. Can you clarify for your self which numbers are valid or bullshit? I know math is your weak point, but as troll you must be a little more clever. Give you some time to think about my little troll friend Lenny.

hurz

7 years ago

@BillyT, in your "simple H bridge" im missing exactly those resistor transistor base pullup and -down against switch on by noise. Resistors you do not need for a single stage and a low beta of 100 like here. But your Bridge is like a darligton topology and needs those resistors angainst switch on by accident 😁

lenzrulz

7 years ago

Do some more research Warner and have a 🍌...😂

hurz

6 years ago

Troll Lenny, you talked about 1Mio EC users, right? Do your research and read your statements again. Math is not easy for you, we know. Regards my little Troll friend Lenny.

BillyT

6 years ago

@hurz, you are correct about the resistors, I was trying to keep the circuit simple, but I've now incorporated some pull down resistors, but I'm uncertain about where to put the pull up resistors.

lenzrulz

6 years ago

Read your statement in which you accused me of overestimating Warner and then we’ll discuss mathematics and the issue of hiding circuits...😬

hurz

6 years ago

My little friend, you made the first statement, are you guessing or just lying as usual my little fraud Lenny?

lenzrulz

6 years ago

I stand by my statement that 99.9% of the EC community don’t hide their circuits. Do some more research and include the despicable practice of hiding circuits, meanwhile Warner have a 🍌...😂

hurz

6 years ago

99.9% is a number from Igor, or you just invented that fact? We know you are a liar, so tell as more!

lenzrulz

6 years ago

I can tell you that you’ve run out of ideas, I can also tell you that you hid your circuits because you hate critique and I can tell you that you enjoy trolling users circuits...have a 🍌 Warner...😂

hurz

6 years ago

So all numbers you have said are your imagination, or lies. My little troll friend Lenny collect some more facts before lying!

lenzrulz

6 years ago

You’ve hidden 600 🍌 I mean circuits...😂

hurz

6 years ago

I dont see how my circuits are related to your lies and fraud statements. Have more bananas 🍌🍌🍌 for better brain activity, my cute little fraud troll friend Lenny.

lenzrulz

6 years ago

Ether you hid your circuits as you’ve publicly claimed or you’ve “deleted” them (highly unlikely) which is it?

lenzrulz

6 years ago

And don’t forget to have a 🍌...😂

hurz

6 years ago

My little liar, were does this 1Mio EC users come from who watch your bullshit circuits? LOL

hurz

6 years ago

You must have a horribble fantasy. You dream from a 1Mio audience? LOL have 1Mio bananas 🍌

lenzrulz

6 years ago

Ask them yourself: info@everycircuit.com

hurz

6 years ago

There you have asked? Lenny you are lying again. Wow, what a dream Lenny, 1Mio watching your circuits. Dream Lenny, dream

lenzrulz

6 years ago

Have you “deleted” your circuits Warner?

hurz

6 years ago

What do you care my circuits, have a banana 🍌 troll. Go and dream of 1mio EC users laugh about your circuits

lenzrulz

6 years ago

You’re lying...😬

hurz

6 years ago

1Mio EC users just your horrible imagination. “99.9%“ one more invention. Two lies in one statemante. And my circuits are still my one and not yours! My little lying troll Lenny.

lenzrulz

6 years ago

Ask Igor; info@everycircuit.com. Why did you lie about deleting your circuits, been eating too many 🍌...😂

hurz

6 years ago

My circuits are my ones and not yours, how many times i have to say that, you must eat the bananas 🍌 and not put into your ears and eyes, my little blind deaf troll. 1Mio EC users and 99.9%.... applause for liar Lenny.

lenzrulz

6 years ago

You’re lying, have more 🍌...😂

hurz

6 years ago

Still to many bananas 🍌 in your eyes and ears? 1Mio watching your banana circuits and 99.9% do ... liar

lenzrulz

6 years ago

Too many hidden circuits, have more 🍌...😂

hurz

6 years ago

Boring

Redstone_guy

3 years ago

@hurz have a 🍌... 😂😂😂😂😂

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