1 How to protect circuits from reversed voltage polarity!
Compares diode and P-channel MOSFET reverse polarity protection, showing the MOSFET wastes far less power; a common reference when adding input protection to a board.
Channel
Afrotechmods
23 recommended videos. Channel on YouTube
2 Inductive spiking, and how to fix it!
Demonstrates the voltage spike when current through an inductive load is suddenly cut and how a flyback diode tames it; often linked for motor and relay driver questions.
3 Transistor / MOSFET tutorial
A beginner tutorial on using BJTs and MOSFETs as switches, often suggested when a microcontroller pin needs to drive a motor, laser or other larger load.
4 ⚡ "It's not the volts that kill you, it's the amps" ⚡
Afrotechmods examines the saying that current rather than voltage kills, and why voltage still matters through body resistance; linked in electrical safety discussions.
5 Fun with ultracapacitors!!
Demonstrates ultracapacitors dumping large currents; cited in threads on shorting capacitors and on whether supercapacitors could replace a car battery.
6 Voltage regulator tutorial & USB gadget charger circuit
A beginner tutorial on linear regulators such as the 7805, ending with a USB charger circuit; suggested to people powering an Arduino or Raspberry Pi.
7 What is PWM? Pulse Width Modulation tutorial!
The standard explainer for pulse width modulation, linked whenever someone needs to dim LEDs or control motor speed from a microcontroller.
8 Diode Tutorial & How to build an AC to DC power supply
Covers diode basics and builds a transformer, rectifier and capacitor power supply; recommended within a beginner series, including on why parallel diodes do not share current.
9 LM317 Adjustable Voltage Regulator Tutorial
An Afrotechmods tutorial on building a variable linear power supply around the LM317, often suggested as a first analogue project.
10 H Bridge Motor Speed Controller Tutorial
Afrotechmods explains a discrete MOSFET H-bridge motor speed controller; suggested for people moving beyond driver modules to understand the basics.
11 🔊 How to make an LM386 audio amplifier circuit
A step-by-step LM386 audio amplifier build that many beginners copy, often followed by questions about its advice to use at least 1000 µF on the output.
12 What is an op amp? Operational Amplifier tutorial & super spy microphone circuit
An introduction to op-amps that builds a sensitive microphone amplifier, linked by beginners replicating the circuit for audio and sensor projects.
13 Comparator tutorial & clapper circuit
An Afrotechmods tutorial on using an op-amp as a comparator, including a clapper circuit, often linked when someone needs a simple threshold detector without a microcontroller.
14 Switch mode power supply tutorial: DC-DC buck converters
Widely praised as a clear introduction to step down switching regulators, covering why they beat linear regulators and how to build a simple one.
15 THE BEST Multimeter tutorial (HD)
A well liked introduction to using a digital multimeter, usually offered to newcomers before they buy or first use one.
16 Amplitude Modulation tutorial and AM radio transmitter circuit
Explains amplitude modulation and builds a simple op-amp AM transmitter; the circuit is widely copied, and people often ask how its mixer stage really works.
17 Constant current power supply and laser / LED driver tutorial
Shows a simple LM317 constant current circuit, offered as a cheap way to drive LEDs, though its fitness for laser diodes gets questioned.
18 DC-DC Boost converter tutorial
A short, intuitive introduction to how a boost converter raises voltage, recommended to anyone who needs the basics before building or choosing one.
19 Passive RC high pass filter tutorial!
A tutorial on passive RC high pass filters, recommended as the step for stripping DC offset or low frequency noise out of a microphone or sensor signal.
20 Peak detector circuit tutorial for beginners
An Afrotechmods explainer on peak detector circuits, repeatedly suggested to people trying to capture the maximum level of an audio or sensor signal.
21 What is a Transformer? An Electrical Transformer Tutorial
Opening video of a power supply series that explains transformers before later parts cover rectifiers and regulators, recommended to beginners building a first linear supply.
22 Voltage divider tutorial
An explanation of how voltage dividers work, commonly linked when a beginner needs the idea of splitting a voltage across resistors.
23 Exploding electronic components in HD
Footage of electrolytic capacitors bursting, shared both for entertainment and to illustrate how the scored vents on the cans fail in a controlled way.
