Abstract: An improved sawtooth generator of the type in which a capacitor is charged slowly from a constant current source and discharged rapidly via a circuit including first and second mutually complementary transistors with the first transistor having its emitter connected to the capacitor and controlled by the capacitor voltage, its base connected to a first reference voltage and to the collector of the second transistor, and its collector connected to the base of the second transistor, and with the emitter of the second transistor being connected to ground. A wide frequency variation range for the above sawtooth generator is realized by the provision of a complementary auxiliary pair of transistors including a third and a fourth transistor.