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69. Cure For a Sick Tortoise
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121 - Shelfington - Frog Polarity Switching
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AC/DC Power for Your Tortoises (209)
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How does DCC Work and how do I wire my Model Railroad for it?
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How to change the direction of polarity with the DPDT Switch
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Wiring A DPDT Switch - 2 Methods Explained
18:51