A pull-up resistor gives an otherwise undriven digital node a defined high level while allowing another device to pull it low.
A Pull-Up Resistor Gives an Input a Default—It Does Not Force Every State Read Post »
Two resistors can produce the desired voltage with nothing connected, then disappoint as soon as a device draws current.
Why a Voltage Divider Is Not a General-Purpose Power Supply Read Post »
Series and parallel battery arrangements change different electrical quantities.
Series and Parallel Batteries Change Different Things Read Post »
A USB oscilloscope does not lose its grounding relationships just because it has no mains cord of its own.
A USB Oscilloscope Still Has Ground Connections to Think About Read Post »
Electrostatic discharge can damage a component without leaving a visible burn mark or an obvious immediate failure.
Why ESD Damage Can Be Invisible Until Later Read Post »
Flux residue is not one uniform substance with one universal cleaning rule.
Flux Residue Is Not Always Harmless—or Always Dangerous Read Post »
A shiny solder blob can hide poor contact with the pad or component lead.
Solder Can Look Shiny and Still Make a Bad Joint Read Post »
A simple LED circuit that works in a drawing can fail on a breadboard because the physical nodes are different from the ones you intended.
Why an LED Circuit Works on Paper but Not on a Breadboard Read Post »
A bench supply current limit can reduce damage from a wiring error, but it does not guarantee an instant ceiling on every current pulse.
A Bench Supply Current Limit Is Not an Instant Universal Protector Read Post »
A breadboard can hide an open connection or an accidental short beneath a perfectly tidy layout.
Breadboards Have Hidden Connections That Can Fool Beginners Read Post »
