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Water Level Indicator

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Yes, the capacitors provide AC coupling so no DC flows through the water.

I notice you've attached a datasheet for the TTL/LS 7414. This circuit will only work with CMOS gates because they have a high input impedance. It won't work with older TTL gates because their input impedance is too low.

If higher voltage operation is required you could use the CD40106 or 74C14 which will work up to 15V.

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