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. 2020 Oct 16;20(20):5862. doi: 10.3390/s20205862

Figure 13.

Figure 13

(a) Load resistance adaption (15–62 kΩ) coping with a vibration frequency variation from 30 to 70 Hz; (b) load resistance adaption (28–46 kΩ) coping with a PZT operating temperature variation from 25 to 50 °C.