Circuit for synchronizing watches driven by a coil-magnet system

Claim 1

A circuit for synchronizing watches driven by a coil-magnet system, by means of a synchronizing signal having a frequency which corresponds to the frequency of the divider output of a quartz oscillator, said circuit powered by a source of supply voltage having positive and negative poles, comprising: a source of a first synchronizing signal; a source of a second synchronizing signal; a drive coil having first and second terminals, said first terminal coupled to said positive pole; a first transistor having base, emitter and collector terminals, said base coupled to said first synchronizing signal and said emitter coupled to said negative pole of the circuit; a second transistor having a base, emitter and collector, said base coupled to said second synchronizing signal and said emitter coupled to said positive pole; a third transistor having a base, emitter and collector, the emitter of said third transistor coupled to said negative pole of the circuit and the base of said third transistor coupled to the collector of said first transistor; a fourth transistor having a base, emitter and collector, said collector coupled to the collector of said first transistor; a voltage divider coupled between the collector of said third transistor and said negative pole of the circuit, the base of said fourth transistor coupled to a junction point of said voltage divider, a fifth transistor having a base, emitter and collector, said base coupled to the second terminal of said driving coil, said emitter coupled to the emitter of said fourth transistor and said collector coupled to said negative pole of the circuit; a first resistor coupled between the base of said fifth transistor and the collector of said second transistor; and a capacitor coupled between said positive pole and the emitter of said fifth transistor.