Circuit arrangement for operating at least one first and one second lamp which can be inserted in said circuit arrangement

A circuit arrangement for operating at least one first (LP1) and one second (LP2) lamp which can be inserted in said circuit arrangement, each lamp (LP1;

• LP2) having a first (W11;
• W21) and a second filament (W12;
• W22), having a drive circuit (18) for the purpose of driving the at least one first (LP1) and second (LP2) lamp, the drive circuit (18) being designed to operate the at least one first (LP1) and second (LP2) lamp using a radiofrequency signal,
• characterized
• in that it also comprises:
• a comparator circuit (10) for the purpose of comparing a first (U6) and a second (U7) voltage potential within the circuit arrangement, and
• a deactivation apparatus (16) for the purpose of deactivating the drive circuit (18),
• the comparator circuit (10) being designed to activate the deactivation apparatus (16) if the difference between the first (U6) and the second (U7) voltage potential exceeds a predeterminable limit value during operation of the at least one first (LP1) and one second (LP2) lamp using a radiofrequency signal.