Electronic switching device preferably operating contactlessly

摘要

An electronic switching device operating contactlessly is shown and described, which can be connected via an external conductor to one pole of an operating voltage source and only via a further external conductor to one terminal of a load, the other terminal of the load being connected or connectable to the other pole of the operating voltage source, with a presence indicator which can be influenced from outside, with a switching amplifier following the presence indicator, with an electronic switch which can be controlled by the presence indicator via the switching amplifier, and with a feed circuit for representing the feed voltage for the presence indicator and the switching amplifier, the feed circuit for representing the feed voltage for the presence indicator and the switching amplifier exhibiting a control circuit (15) having an input transistor (16), an auxiliary transistor (17), an output transistor (18) and a reference voltage source, namely a Zener diode (19), and the base (20) of the auxiliary transistor (17) being connected to the reference voltage source, that is to say to the Zener diode (19). Due to the fact that only one reference voltage source, namely only one Zener diode (19) is provided and the base (36) of the output transistor (18) is also connected to the single reference voltage source, that is to say to the single Zener diode (19), the electronic switching device according to the invention exhibits in the conducting... Original abstract incomplete. <IMAGE>