You may ask why the output of each oscillator is connected to an additional Schmidt inverter. Indeed, this additional inverter is not not necessary, it is a key component of the oscillator - the "buffer." This buffer separates the oscillator and the motor drive circuit. This separation is necessary, because the first output of the inverter. Without separation, the maximum voltage at which the capacitor is fully charged may be lower than the trigger voltage (shown in FIG. 15), thereby interrupting the oscillations. Therefore, we need a buffer to ensure that the circuit will not interfere with each other, and be able to work according to the original design.
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