ResearchGate

List of links to my RG contributions

Electrical quantities

Why do we prefer using voltage than current as a data carrier in electronics? Why are most of electronic devices implemented as voltage converters?

Are there causal relationships in Ohm's law? If so, which is the cause and which is the effect?

Theory

Is there a paradox in the superposition principle?

Elements
----- True elements
---------- Passive elements 

What is "passive" and what  "active" in electricity and electronics? Can we make  passive elements become "less passive", "neutral" or even active?

What is "linear" and what "nonlinear"? Is a linear resistor "static" and a nonlinear - "dynamic"? Is a nonlinear resistor a dynamic linear resistor?

Is a transistor really an amplifying element? Is it an active or passive device? Are there amplifying elements? Is it possible to amplify energy at all?

Does the current flow through a capacitor, and if so, why?

What do coupling capacitors really do in AC amplifiers? Are they rechargable "batteries" conveying voltage variations or diverting biasing currents?

---------- Sources

Is a charged capacitor a voltage source? Is a charged inductor a current source? Is there any difference between them and "true" electrical sources?

What is "current source"? Are there true current sources? If not, how do we create artificial current sources? How do we make them perfect?

What is the basic idea behind the BJT current mirror? Is it a reversible device (can we swap its input and output) and why?

What is the brilliant idea behind the Howland current source?

---------- Active elements

Is a transistor really an amplifying element? Is it an active or passive device? Are there amplifying elements? Is it possible to amplify energy at all?

Voltage or current controlled device is a BJT? And what does "voltage controlled" and "current controlled" mean? Is this a property of the BJT?

----- Virtual elements 

Can we swap the voltage across and current through electrical elements? What is the use of such a "swapping technique"? Can you show some examples?

What is the basic idea behind the memristor? Is there something magnetic in the memristor operation as it is presented by a magnetic flux variable?

What is the truth about the Deborah Chung's "apparent negative resistance"? Was it a reliable scientific experiment or only a scientific sensation?

How many types of resistance can be represented by a variable resistor?

Why are there two types of negative resistance?

And why are there two more types of negative resistance?

Circuits

----- Passive circuits

Why is there a phase shift in RC circuits? How do we make it exactly 90 degrees?

What is the basic idea behind the Wien network? How does it operate in the frequency and time domains?

----- Active circuits 

Can we connect a floating voltage source between the two inputs of a differential amplifier? If so, at  which conditions?

----- Negative feedback circuits

What is actually a negative feedback system? What and how does it actually do? How is it implemented? Is it really a negative feedback or sth else?

What is the simplest negative feedback system? What is its structure? How does   it operate? How do we implement simplest negative feedback circuits?

What are actually the input and output of a negative feedback system? Can we consider the input quantity as a disturbance and the output quantity - as a reaction?

Can we apply the input voltage to the output of a voltage follower instead to its input and to take the current as an output? Is it correct?

Can we see the negative feedback principle in the operation of the common-base stage? Can we think of it as of a disturbed common-collector stage?

Why the gain of the non-inverting amplifier is 1 + R2/R1 while the gain of the inverting amplifier is only R2/R1? Is this a desired difference?

Can we apply an input current to the collector of a BJT whose base is held at a constant voltage and to take the collector voltage as an output?

Can we reverse (swap the input and output of) any unidirectional device by applying a negative feedback? If yes, what will be the use of this trick?

Can we "reverse" a voltage divider by applying the input voltage to its output and taking the output voltage from its input?

Can we "reverse" a BJT by passing the input current through the emitter and taking the base-emitter voltage as an output? Where can we see this idea?

Can we "reverse" a BJT by injecting the input current into the collector and taking the base-emitter voltage as an output?

----- Positive feedback circuits 

---------- Oscillators

How do sinusoidal oscillations arise in RC oscillators?

Is the Barkhausen criterion (about the loop gain) right in the case of the Wien bridge oscillator?

What is the basic idea of the Wien bridge oscillator? How does it operate?

Circuit techniques

----- Passive compensation

What does "biasing" mean and how is it implemented in electronic circuits?

What is the basic idea behind the twisted pair? Why are the two wires twisted? How does this arrangement compensate undesirable disturbances?

----- Virtual ground 

As the virtual ground is a kind of ground, can we connect it to the real ground? Can we connect together two or more virtual grounds?

----- Current steering 

What is "current steering" and how is it implemented? Is there a dual "voltage  steering"? If so, what is it and how is it implemented?

Digital electronics

----- Number systems 

What is the idea of the division-by-2 method for a decimal-to-binary conversion?

What is the idea of the two's complement code?

Circuit methodology 

Why are circuit ideas hidden?

What does "to understand a circuit" mean?

What are integrated circuits - circuits or elements of circuits?

Education

How do we motivate students in the laboratory? What is more important there - the technical equipment or the teacher's skills?

What are the human aspects of the "digital revolution"? What is the impact of the "digitalization" on the today's life and technical education?