1 AC versus DC load breaking comparison with a knife switch
Shows a knife switch breaking AC and DC loads side by side; cited to explain why switches and relays carry much lower DC ratings than AC ones.
Topic
relay
8 videos. Ranked by independent recommendations, not by views.
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 Raspberry Pi: 8 Channel Relay step-by-step with software examples for automation
Step-by-step wiring of an 8-channel relay board to a Raspberry Pi with Python examples; people reuse its scripts and point to it for relay-board questions.
4 Using Relays and Relay Boards with the Raspberry Pi
Explains driving relays and relay boards from Raspberry Pi GPIO pins; people follow it as a wiring tutorial and ask whether 3.3 V logic safely triggers 5 V boards.
5 How to Make a Battery Protection Circuit (over-discharge protection)
DIY Perks builds an over-discharge cut-off for lithium cells using a low-voltage alarm module to trigger a relay; used as the starting point for home-made protection boards.
6 EEVblog 1409 - The DANGERS of Inductor Back EMF
Dave Jones shows the voltage spike an inductor or relay coil produces when switched off, which explains why flyback diodes are fitted across coils and motors.
7 Turn your lights on with clapping?! || Arduino Clap Circuit
A tutorial for a clap activated switch that drives a relay, recommended as a clear explanation of the design choices for newcomers.
8 EEVblog #961 - Monkey Debouncing
Dave Jones explains switch and relay contact bounce and the hardware and software ways to debounce it; recommended when microcontroller interrupts misfire on noisy inputs.
