using transformer coupling

Electronic switching or gating, i.e. not by contact-making and -breaking > characterised by the use of specified components > by the use, as active elements, of semiconductor devices > the devices being bipolar transistors > with galvanic isolation between the control circuit and the output circuit > using transformer coupling

Electronic switching or gating, i.e. not by contact-making and –breaking (gated amplifiers H03F3/72; switching arrangements for exchange systems using static devices H04Q3/52) > characterised by the components used (H03K17/04 - H03K17/30, H03K17/94 take precedence) > by the use, as active elements, of semiconductor devices (using diodes H03K17/74) > the devices being bipolar transistors (bipolar transistors having four or more electrodes H03K17/72) > with galvanic isolation between the control circuit and the output circuit (H03K17/78 takes precedence) > using transformer coupling