I'd suggest darlingtons array, ULN2003A or may be ULN2001A with base R barely enough to trigger with higher voltage and not with lower. Other option is optocoupler, with couple resistors in front as voltage divider.
The current will be low (~340 mA)
Amplitude voltage of 1 VAC is 1 x sqrt(2) = 1.41 Vand 1.5 VAC x sqrt(2) = 2.12 Vthis is why I think Darlington or optocoupler would works.
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