Posts

These are internal links pointing to my posts in this blog. They are arranged by their content (not chronologically as in the home page). In each section, the posts are arranged in the order passive -> transistor -> op-amp -> negative feedback -> positive feedback.

General circuit stories

Why I created this blog

My Creative Evolution

Моята творческа автобиография

За всички, които дойдоха с надежда и си отидоха с разочарование...

Нови моменти от работата ми със студентите в условията на онлайн обучение

"Thank You!" - from a former student  NEW!

"Благодаря!" - от един бивш Ваш студент

Inventing LED circuit with Gemini AI  NEW!

Изобретяване на светодиодна схема с Джемини AI

Ако не можеш да обясниш нещо на 6-годишно дете...

Опитвайки се да обясниш нещо на едногодишно дете:-)

Имейл до 48-ма и 49-та група, ИТИ, 2-ри курс

A system of Heuristic Means for Functional Operation with Basic Electronic Circuits

Система от евристични средства за функционално опериране с базови електронни схеми

How to Understand Circuits

How to Present Circuits

How to Invent Circuits

Building Circuits

Reinventing Circuits

How to Derive Basic Circuit Principles

Как да извличаме базови принципи за изграждане на електронни схеми

A System of Basic Circuit Pinciples

Система от евристични принципи за изграждане на електронни устройства

Using Analogies to Understand Circuits

Combining and Varying Electrical Quantities

Using Cause and Effect Relationships

What Is the Operating Point?

My thoughts extracted from a discussion with LvW

My thoughts extracted from a discussion with TL Fong

Where do currents flow in circuits?

What are voltages in circuits?

What are voltages inside resistors?

Do I misunderstand fuses

How does a diode maintain a constant voltage?

How does a transistor maintain a constant current?

Why does the collector current depend linearly on the base current?

How I Revealed the Secret of Parallel Negative Feedback Circuits

Why does the Darlington pair have a higher input resistance?

"Изобретяване" на базови схеми с операционни усилватели

Tutorials

The secret of invention:

     Try to Invent!

     Where to Start

     In the Realm of Chance

     The Inventor's Tools

     Expanding the "Toolbox"

     "Crystallization" of the Idea

     Invention in Action

Тайната на изобретението:

     Опитай се да изобретиш!

     Откъде да започнем

     В царството на случайността

     Инструментите на изобретателя

     Разширяваме инструментариума

     "Кристализация" на идеята

     Изобретателството в действие

Short Building Tutorial of Analog Circuits

Електротехника за електроници

Projects:

"Идеален” волтметър

"Идеален“ амперметър

Характериограф за двуполюсни елементи

Simple curve tracer for diodes

Характериограф за триполюсни елементи

Curve tracer for transistors

Изследване на базови транзисторни усилвателни схеми

How do we investigate basic transistor amplifier stages?

Изследване на базови схеми с операционни усилватели

Investigating basic op-amp amplifier circuits

СКЕ 2022

ЛУ1 СКЕ 2022

ЛУ2 СКЕ 2022

ТЕ ИТИ 2022

У1 ТЕ 2022

У2 ТЕ 2022: Основни електрически и измервателни понятия

У3 ТЕ 2022: Електрически схеми с резистори

ППЕ ИТИ 2021

ЛУ1 ППЕ ИТИ 2021

В края на първото лабораторно упражнение...

ЛУ2 ППЕ ИТИ 2021

В търсене на интересни експерименти за третото упражнение...

В търсене на още по-интересни експерименти за третото лабораторно упражнение по СКЕ...

ЛУ3 ППЕ ИТИ 2021

ЛУ4 ППЕ ИТИ 2021

ЛУ 5: Приложни схеми с диоди

Is the source internal resistance really a resistance?

Lists of my links

Does a Transistor Amplify?

Circuit fantasia

A short history of my web work (circuit-fantasia.com)

How to Understand, Present and Invent Electronic Circuits (a brief description of circuit-fantasia.com)

StackExchange

StackExchange through my eyes

StackExchange през моя поглед

What actually flows, current electricity or charge?

What does voltage drop mean in a circuit?

Are shoes comparable to capacitors if receiving electric shock from one lead?

Why does AC pass through my body if I touch a hot wire?

Current limiting resistors and voltage dividers

Why do we connect a resistor before a Zener diode?

Use Wheatstone bridge to measure unknown resistance

An ammeter connected directly to an ideal source through ideal conductors... ?

I have to do a project building DC voltmeter, ammeter and AC voltmeter...

Are there "inverted relays"?

Charging of capacitor in RC circuit

What is the purpose of the resistor in a RC circuit?

Why does a capacitor connected to AC and high impedance act as wire?

Inductor polarity

Why does a diode placed in series before an inductor not protect from surge?

How to make/describe an element with negative resistance of minus 1 Ohm?

Why is the voltage across the resistor R zero during the negative half cycle for a clipper circuit?

How do power adaptors provide adjustable current to devices?

Does ground wire replace a voltage stabilizer?

Calculate V for given circuit

Half wave rectifier query

How is the output voltage calculated in clipper circuits?

Which is better - series or parallel rectifier?

Parallel voltage sources (diode on one branch)

LED wired to GPIO in an unconventional way

Why does the TTL NAND gate use a 4 transistor design instead of 2?

How can a transistor amplify current in a circuit?

Why does this NPN transistor operate differently if it comes before the switched element?

Common Base Amplifier Confusion

Emitter current

Common-Source Amplifier

Trying to understand how this pnp works

How does this transistor-based voltage detector circuit work?

JFET as an amplifier

Differential pair active load contradiction

Help with differential to single ended voltage converter

Can we declare Schmitt triggers to have memory? Can we call their output levels states?

Class AB power amplifier from "Electronic Devices" by Thomas L. Floyd

Class AB BJT biasing, diodes

How does this transistor-based voltage detector circuit work?

Amplification and bias point

What's the need to set the amplifier input common mode voltage to mid–supply voltage...?

Where has this current gone in my current-voltage converter?

Why would I want to use a differential op amp configuration while amplifying differential signals?

Where do input bias currents flow?

Op-amp - "Allowable input differential voltage"

Input impedance for a difference amplifier OpAmp circuit

Inverting Amplifier Not Applying Gain to Bias Voltage

Universal (magic) Op-Amp Fundamentals

What is the purpose of this op-amp topology?

What is an integrator topology?

Reasons to use charge amplifier?

About "Always inverting except when you can't" of OPA

Opening the feedback of an Op Amp to have more gain

Vout of an op-amp ever exceed gain?

How does this constant current circuit work?

What does this op-amp circuit do? (part of an ECG)

Why use a three op-amp instrumentation amplifier?

Understanding Rgain of an instrumental amplifier

Op-amp input resistor?

Understanding how the simple precision rectifier works

A story about the op-amp precision rectifier

Confusion in precision rectifier

Precision Rectifier confusion

Ideal diode confusion

Why does the regenerative circuit not saturate?

What is this circuit called, and what is it used for?

SE EE CircuitLab stories 

In the world of simulations

В света на симулациите

My CircuitLab stories on StackExchange

Моите CircuitLab истории в StackExchange

My CircuitLab bag of tricks

Моята CircuitLab "торба с трикове"

How does the current and voltage stabilize in a differential amplifier?

How to make an element with negative resistance?

Output voltage level of TTL gate

SE EE AI stories NEW!

Talking with Gemini

How do we collaborate with AI in answering SE EE questions

Discussing StackExchange with Gemini AI

Analyzing 4-diode analog switch AI

The misleading "common collector" AI

What do we see when looking at the transistor from the emitter side? AI

Why does a half-bridge amplifier output half the voltage? AI

Reinventing NIC with Gemini AI

Reinventing basic op-amp circuits with negative feedback AI

Which is better - series or parallel rectifier?AI NEW!

Codidact

How to plot the I-V curve of a tunnel diode?

Is it possible for one transistor to switch between two loads?

3-LED voltage indicator (an inventor's story)

Battery backup voltage regulator (an invention story)

Help with differential to single ended voltage converter

Charge amplifier (a qualitative view)