Uploaded August 2017 | Updated September 2026, 37 minutes ago

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This is a simple Polarity Detection Circuit for distinction between AC and DC.
Two switches adjust the operating voltage.
Switch 1 : ON, Switch 2 : ON - 6V ~ 12V
Switch 1 : ON, Switch 2 : OFF - 12V ~ 30V
Switch 1 : OFF, Switch 2 : OFF - 30V ~ 300V