How do passive circuits work with no battery/power source?
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Power source is the part that’s probably the vaguest and most complicated. If you mean electrical supply then you have passive radio receivers or near field circuits which get their power from radio waves and bounce back a code with the power given to thwm by the radio waves.
There is no circuit (that i can think of) that has no form of power coming in. The power isn’t always direct electric current
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