When we use a 120k resistor we get a frequency of 18-22kHz and a tkeep of 180ms. When we use a 100k resistor we get a non stable frequency of 28kHz and a tkeep of 2ms. 68k gives freq of 60kHZ and tkeep 2ms. 200k gives freq of 10.5 kHZ and tkeep 170ms.
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