Non Isolated DC DC Converter-Module

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  K7803MT-500R4 : 3.3V, 0.5A Non Isolated Dc-Dc Converter – PO-1728-D

  $1.05
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  K7805-500R3 : 5V,0.5A Non Isolated Dc-Dc Converter – PO-1713-D

  $2.11