Block vb pcb mount dual output transformers 28va block vb 2 829 the block vb pcb mount transformer 28va 2 x 9v 2 x 311ma has been designed for high ambient temperatures and is unconditionally short circuit proof this high quality transformer is also equipped with double output voltage for series or parallel connection while boasting permanent corrosion protection high insulation value and maximum electrical reliability thanks to xtradensifill resin encapsulation vb dual voltageprima