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Q&A

Posts tagged transistor

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Q&A BJT common emitter amplifier equivalent circuit (π hybrid model) [closed]

Im studying the equivalent model of a BJT common emitter amplifier at high frequencies.At university we tought that the BJT at high frequencies looks something like this: However when designing ...

0 answers  ·  posted 27d ago by MissMulan‭  ·  closed 27d ago by Olin Lathrop‭

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Q&A Identification of semiconducting electrical components

We identify semiconducting electrical components this way: The first digit represents the number of pn junctions inside the semiconducting device The two or more digit number starting at position...

1 answer  ·  posted 9mo ago by MissMulan‭  ·  last activity 5mo ago by Jasen‭

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Q&A Thévenins Theorem for Transistor Circuit

I am calculating the base current of transistor Q1. To simplify the circuit equations, I applied the Thévenin's theorem twice and converted V1 and R1, R2 into Vth and Rth as shown in the image. Vt...

2 answers  ·  posted 7mo ago by kadamrohan16‭  ·  last activity 7mo ago by Olin Lathrop‭

Question Analog transistor bjt
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Q&A PNP Darlington pair as a current limiter

I am trying to analyse what is controlling the load current in the below Darlington configuration. Is it the base current of transistor Q3 which is controlling current through R14 / emitter curr...

1 answer  ·  posted 10mo ago by kadamrohan16‭  ·  last activity 10mo ago by Olin Lathrop‭

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Q&A Confusion with Wikipedia article on multivibrator circuit [closed]

A while ago I made a question about the monostable multivibrator .Lets get a picture of it: When switch is closed it enters its unstable state and it eventually returns to the stable state Howe...

0 answers  ·  posted 1y ago by MissMulan‭  ·  closed 1y ago by Olin Lathrop‭

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Q&A What is the difference between emitter and collector of a transistor?

In all descriptions of how (non-FET) transistors work I've seen, there is an inherent symmetry: There's either an n-doped layer between two p-doped, or a p-doped between two n-doped, and the descri...

2 answers  ·  posted 1y ago by celtschk‭  ·  last activity 1y ago by Olin Lathrop‭

Question transistor
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Q&A How building a follower satisfying rather extreme requirements.

What is your best suggestion for building a follower that would ideally satisfy the following spec: frequency: from 100 Hz (or lower) to 1 GHz input signal impedance: 1 Mohm input signal ampli...

1 answer  ·  posted 1y ago by coquelicot‭  ·  edited 1y ago by coquelicot‭

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Q&A Is a BJT 3-transistor Wilson mirror faster than a simple mirror?

My question is trying to understand if there is an effect on the switching time, on both turn-on and turn-off, between the following configurations. A mirror set up to switch a current, and there ...

1 answer  ·  posted 2y ago by Pete W‭  ·  last activity 2y ago by Olin Lathrop‭

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Q&A Using FET based followers and design rules

Usually, voltage followers are built with bipolar transistors (or with opamps if better precision is needed). In this case, the simple rule says that the transistor emitter "follows" the input vol...

5 answers  ·  posted 2y ago by coquelicot‭  ·  last activity 2y ago by TonyStewart‭

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Q&A Why Ib=const. for BJT output characteristics Ic=f(Vce)

As I have learned, it is allowed to ask a question here to which I already know one of several possible answers. Introduction: In some books and other technical papers (also from universities) it i...

4 answers  ·  posted 2y ago by LvW‭  ·  edited 2y ago by LvW‭

Question transistor
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Q&A Purpose of emitter resistor in a common collector amplifier

I see a lot of common collector amplifiers with the output taken across an emitter resistor. What is the purpose of doing it this way instead of connecting your load directly to the emitter? I shou...

4 answers  ·  posted 2y ago by jm567‭  ·  last activity 2y ago by LvW‭

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Q&A Complementary transistor pairs - what is the point ?

I understand that some applications require NPN-PNP pairs with identical electrical characteristics. But I would like to understand why.

2 answers  ·  posted 2y ago by coquelicot‭  ·  last activity 2y ago by Olin Lathrop‭

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Q&A Darlington or Sziklai configuration - why and when using complementary pairs?

Why does the Darlington or Sziklai configurations need complementary transistors? For these configurations, when should I use complementary pairs and when could I use not complementary pairs ?

1 answer  ·  posted 2y ago by coquelicot‭  ·  last activity 2y ago by Olin Lathrop‭