Author: SEARU

What's wrong with my English? [Copy link] 中文

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Post time 2017-12-7 05:30:41 |Display all floors
pnp Post time: 2017-12-6 14:50
Interesting, I am not trained in science, what do they mean, NPN, PNP?

NPN - Negative, Positive, Negative

PNP - Positive, Negative, Positive.

The letters refer to the electrical properties of each layer in a Bipolar transistor.  Negative doped, Positive doped.  
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Post time 2017-12-7 05:34:11 |Display all floors
This post was edited by Ratfink at 2017-12-7 05:35

Searu, firstly your English usage is commendable though sometimes you have issues with verbs, adjectives and word order.  With that said you do try hard and most of the time your writing is above average for a NESB person. There are noticable improvements from your early days on the forum.
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Post time 2017-12-7 09:23:07 |Display all floors
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Post time 2017-12-7 10:23:12 |Display all floors
This post was edited by SEARU at 2017-12-7 12:50
Ratfink Post time: 2017-12-7 05:34
Searu, firstly your English usage is commendable though sometimes you have issues with verbs, adject ...

Thanks for your constructive  remark that is so warm and full of encouragement to me!
I always believe that real flying could make wings grow stronger and hard labor-work can make Smith‘s muscles so hard! ---------I am determined that I would spend more free time on writing here since it is meaningful for me as a teacher through which I could contribute my force to development of Chinese culture!
All of our writings should go with zero error!

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Post time 2017-12-7 10:23:32 |Display all floors
Ratfink Post time: 2017-12-7 05:34
Searu, firstly your English usage is commendable though sometimes you have issues with verbs, adject ...

Thanks for your construction remark that is so warm and full of encouragement to me!
I always believe that real flying could make wings grow stronger and hard labor-work can make Smith‘s muscles so hard! ---------I am determined that I would spend more free time on writing here since it is meaningful for me as a teacher through which I could contribute my force to development of Chinese culture!
All of our writings should go with zero error!

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Post time 2017-12-7 11:26:33 |Display all floors
Ratfink Post time: 2017-12-7 05:30
NPN - Negative, Positive, Negative

PNP - Positive, Negative, Positive.

Wow, so technical, but thanks.

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Post time 2017-12-7 13:32:46 |Display all floors
pnp Post time: 2017-12-7 11:26
Wow, so technical, but thanks.

I did forget to mention that this only applies to bipolar transistors.  These are one of the fundamental building blocks of integrated circuits as well as many stand alone transistors such as the BD139 etc.  There are other junction types as well.
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