EDIT: I originally thought that a Latching Dual Coil DPTD circuit using a single 5VDC power supply might be possible and tried to conceive one that would work. After discussing it offline with @gunrunnerjohn, the design I had would have been problematic in providing switched power to the relay coils. He has a better solution than mine using a Boost Converter with + and - 5VDC outputs from a single 4.5VDC power source. His solution is a couple replies down the page.
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