While this can be done by direct connection with a multimeter, non-contact methods are available too. A great example is this simple wireless AC current detector from [NEW PEW]. The circuit is a ...

The current limiting circuit, though, is where things get interesting. Rather than use an op-amp, [DiodeGoneWild] chose a simple discrete transistor current-sense circuit. To make it less ...

Passive components don’t need an external power source to function and only require the current traveling through the connected circuit. They either consume or store energy. A simple way to test ...