# Questions tagged [electronics]

Electronics is the study of electric circuits and electrical components, and the design of useful devices. Some questions in this tag may be more appropriate for the [Electrical Engineering(https://electronics.stackexchange.com/) SE site.

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### Confusion regarding the quasi neutrality approximation for PN Junction analysis

Why are they called quasi neutral and not exactly neutral? What happens which make them that? In the analysis we have done to derive the I-V characteristics , we always maintained neutrality where ...
0answers
12 views

### What is equation output voltage in oscillator? [migrated]

I was reading about oscillator circuits but could not find any equation of output voltage in terms of circuit parameters (like mutual inductance, inductance, capacitance, DC sources etc)over internet. ...
0answers
31 views

### Can we use the photochromic lens as a MOSFET?

So the way a MOSFET works is it has a channel through which either hole or electron current is controlled through the gate voltage making it a switch. Now a photochromic lens has changeable ...
0answers
30 views

### Voltage amplifier transistor [closed]

Can we make a voltage amplifier by a simple transistor circuit? The voltage gain of this voltage amplifier wil depend on the resistance we put between the Vout- and the Vout+ terminal . And the ...
0answers
12 views

### How do you calculate the reflectivity of material from its conductivity?

How do you calculate the reflectivity of material from its conductivity? For example, gold at v=9x10^12/s (this problem is from the electronic property of material by Hummel). Is it possible to use '...
1answer
22 views

### Is “quaternary” adjective redundant while speaking of InGaAsP?

I'm reading an article. One sentence looks as following: The 500 nm thick waveguide layer consists of an InGaAsP quaternary layer But since InGaAsP is quaternary compound, why do they write ...
1answer
18 views

### p- and n- contact metal difference

I'm reading an article about some electronic components and the authors specify that they used p- and n- contact metals, but without giving details about those metals, or what material are they really....
5answers
378 views

### Why complex numbers are used in electronics? [duplicate]

The impedance of a capacitor or an inductor is imaginary. How do we know these quantities are imaginary?
0answers
28 views

### Can someone help me decipher the code for the arduino? I am totally lost [migrated]

The code is as follows: void loop(){ light = analogRead(5); Serial.println(light); analogWrite(3,light/4); }
1answer
42 views

### How can a doped piece of silicon (with different concentration) still be intrinsic? [closed]

I am trying to solve a question which says: A piece of silicon is doped with Nd = 1.8*10^(13) and Na= 3.8*10^(13) Prove it is intrinsic at 500k. I don't know how is it possible for silicon to be ...
1answer
38 views

### Does aluminum in between stop induction cooktop from warming iron?

There is an ongoing discussion about induction cooktops on Seasoned Advice. The situation in nutshell is: About 1 cm of aluminum on the cooktop. About 1 cm of iron on top of the aluminum. My ...
1answer
53 views

### Why a photon cannot change the crystal momentum of an electron?

We know that absorption of a photon excites an electron from the valence band to the conduction band without changing its crystal momentum $\vec{k}$. Why can't a photon change the crystal momentum of ...
1answer
48 views

1answer
43 views

### If the current entering a charge preamplifier is a positive pulse, could the output voltage really be a positive pulse?

In this web page: http://physicsopenlab.org/2017/09/27/charge-sensitive-preamplifier/ they show the input voltage to a preamplifier and the output voltage. If I do the quick computation (see below), ...

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