Good Video on Ballast Control
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I like this solenoid arrangement as it is far less fiddly than the mechanical option. Does anyone know where they are they available? -
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The person who made the video is Jakub Fk Chablis at rcshipyard.com. Reach out to him and see if he can answer your questions (although I believe he is vacationing right now).
If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.Comment
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Available in various sizes and voltage ratings. Prices vary a great deal too. e.g.
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