Dual rail 12 volt supply from 24 volt SMPS

Preamble

After seeing this 24 V SMPS on eBay, Protek 24V 8.4A 200W SMPSU Switch Mode Power Supply Medical Grade PSU PM200-14C, I thought it would be initially useful for a 24 V 3D printer. Then I thought it would be handy for a ±12 V supply for a synth… man, the possibilities are freaking endless..!

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