  A bilayer electron system in a strong magnetic field at low temperatures,
with total Landau level filling factor nu =1, can enter a strongly coupled
phase, known as the (111) phase or the quantum Hall pseudospin-ferromagnet. In
this phase there is a large quantized Hall drag resistivity between the layers.
We consider here structures where regions of (111) phase are separated by
regions in which one of the layers is depleted by means of a gate, and various
of the regions are connected together by wired contacts. We note that with
suitable designs, one can create a DC step-up transformer where the output
voltage is larger than the input, and we show how to analyze the current flows
and voltages in such devices.
