已研制出的这种电路是用在交流电桥电路中,代替昂贵的差分放大器。把一只三绕组的脉冲变压器与电桥的下端臂串联。十进电阻箱R_V和可变电感器L_V用于精密平衡,而R_1/R_2的比可以提供线路调整。因为当电桥处于平衡时,变压器的电感迅速地降到其漏磁值,而使 This circuit, which has been developed, is used in AC bridge circuits instead of costly differential amplifiers. A three-winding pulse transformer is connected in series with the lower arm of the bridge. The decade resistance box R_V and the variable inductor L_V are used for precision balancing, and the R_1 / R_2 ratio provides line regulation. Because when the bridge is in balance, the transformer inductance rapidly dropped to its leakage value, so