be v d with proper polarity point 29 being for all practical purposes at zero potential when the invention is on will cause a flow of current in the switch through branch 61 the switch of the present invention in the presence of an 34 on 34 signal from d c voltage source 15 will provide a current path to ground 11 for load 13 and thus the function represented by load 13 will operate the power loss caused by the presence of the switch of the present invention will be v 63 v d times the current flowing through load 13 the driver transistor 33 being in an emitter follower configuration a voltage difference of v be v d will be the maximum achievable potential drop between point 29 and point 65 when a higher potential difference with the proper forward polarity appears across points 29 and 65 the driver transistor 33 diode 53 combination will respond by a tendency to pass an increased flow of current from the emitter of driver transistor 33 into branch 61 insofar as such a current flow may be accomplished by an increased flow of current into the base of driver transistor 33 an undesirable drop in the potential of point 29 v 29 will be achieved such a drop results from the fact that current flow within phase inverter 7 from point 43 to point 45 will be diverted or siphoned to some extent at point 29 lessening the potential difference between points 29 and 45 caused by a reduced current flow through resistor 39 such a drop in potential is undesirable in light.