Building simple circuits with copper tape, LED bulbs, resistors, and watch batteries is not as simple as you might think. Notre Dame Elementary School STEM students are putting the engineering design ...
When working around mains voltages, it can be useful to know whether a given circuit is live or not. While this can be done by direct connection with a multimeter, non-contact methods are available ...
Figure 1 This circuit works in most rechargeable batteries. It comprises a reference LED, LED REF, which operates at a constant current of 1 mA and provides reference light of constant intensity ...
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