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i have digital voltmeter. its i\p rang is 50vac to 500vac & ALSO 15 VAC FOR CKT SUPPLY VOLT. BOTH SUPPLY USE 1 PONT ARE COMMEN.IT MEAN 15 VAC\DC USE STEP DWON TRANSFORMMER OR SMPS .
SO I DESIDE I USE A STEP DWON ANALOGE CKT FOR 15 VAC\DC.