In the single ended situation, the major disadvantage of this method is the average DC current that flows in the circuit must be supported by the transformer, making the transformer relatively large so that it does not saturate due to the DC only.

• 在单端电路中，主要的缺点是变压器必须能足够支持电路中的直流，这样变压器必须做得足够大才不至于仅仅因为直流而发生磁饱和。