Appliance Status Monitor Circuit using LED
Here's appliance status monitor circuit that serves to monitor the level of power usage that is reflected in the parameters of current and AC working voltage of the equipment used.
This simple circuit will light a LED when the connected circuit draws more than 3 A ac. At 220 volts, this means something more than 600W. Replace the LED with an opto-coupler and connect it to the PC serial or parallel port to monitor when an appliance or an industrial
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