Circuit arrangement for contactless switchover of operation parameters of an electrically driven tool

A circuit arrangement for a contactless switch-over of operational parameters of an electrically driven tool, comprising:

• a stabilized supply source;
• a voltage divider which comprises a plurality of first resistors;
• a second resistor, wherein said second resistor is an ohmic resistor which provides a second resistance;
• a contactless switch;
• a voltage source which provides a source of current to said contactless switch;
• and
• a diode,
• wherein said contactless switch-over of said operational parameters of said electrically driven tool is determined by a nominal voltage (V.sub.nominal) which is obtained from said stabilized supply source through said voltage divider and which is variable by a switch-selectable change of a voltage divider ratio of said voltage divider, and further wherein said change of said voltage divider ratio is performed by a selective switching of said second resistor in parallel with one of said first resistors of said voltage divider by means of said contactless switch, wherein said contactless switch has a current supply which comes from said voltage source which lies in series with said stabilized supply source, and further wherein a circuit of said contactless switch, in a conducting state, puts a low end of said second resistor on a low end potential of said voltage divider by making said diode conductive and, in a non-conducting state, separates said low end of said second resistor from said low end of said voltage divider by blocking said diode.