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  • Pneumatic Digital Amplifier with Positive Feedback System

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Described in this paper, is a switching device based on a pneumatic amplifier with a positive feedback system. Two sets of bellows are located on the same axis in an enclosure, and divide it into three chambers. A nozzle is put on a movable end of one of the sets of bellows and faces the movable closed end of the other. The nozzle is pneumatically connected to a constant pressure source through an orifice provided in the fixed end of the former bellows, and its back pressure is used as the output of the device. The positive pulsating pressure introduced in the latter bellows serves as the input signal for setting the device and keeps the output pressure at a high level by the positive feedback action of the former bellows. The pressure within the enclosure serves as the input signal for resetting the device and causes the output pressure to fall off by compressing the both sets of bellows. Negative pulsating pressure can be also applicable as the input signals, where the pressure within the enclosure serves as the set signal and the pressure in the latter bellows as the reset signal. Experiments were conducted with an apparatus made on trial. The conditions of setting or resetting the device and the dynamical behavior were discussed using the results.

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