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Originally Posted by pauldenton
hmm - surely the easiest way to get an RD-20 that spins at that speed at 12V is to use a step-up transformer to raise the 12V to the required voltage? (or indeed a dedicated supply at the required voltage since people may not wish to draw on tehir PSUs 12v rail(s)..)
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Total pump power draw would be ~20W or so, so given a step-up transformer efficiency of ~80%, we're talking about a 25W power draw from a PSU 12v rail, which is nothing.
Yeah, the easiest way to do it using existing equipment is to use a step-up transformer and an existing Iwaki RD-20. Would be nice if the transformer were not needed though.
Depends - are we interested in getting such pumps made up and done right and running off a 12v rail, or are we just looking to skirt around the limitations and put together an "ideal pumping characteristics" kit?
Either way, it'd probably cost the end-user about the same. i.e. existing pump + transformer, as opposed to custom pump production run rewired for 12v native.