What is the most appropriate vibration frequency for an . . . - 知乎 The question you're asking about is what the most appropriate cleaning intensity should be Cleaning intensity is represented by three dimensions: vibration frequency, brush head amplitude, and torque These three factors are not positively correlated, so there isn't a single state where all three are at their maximum In fact, if the frequency is too high, the brush head will feel weak, and
How to solve the problem of attenuation in high-frequency . . . - 知乎 High-frequency circuits should use less resistance, if possible, and substitute with inductors Inductors should be high-frequency inductors, with lower losses The inductance value should be determined and wound by yourself Testing the inductance value with a vector network analyzer is the only method considered A scope might also work
Can STM32 be used to measure the frequency and power of the . . . - 知乎 The frequency cannot exceed the highest frequency of the STM32 interrupt, and for MHz-level signal frequencies, it cannot be accurately measured (if the circuit is modified and a counter chip is used for counting, then high-frequency square wave signals can be achieved through frequency reduction)
Is it really possible to identify the dialed number by . . . - 知乎 This is not difficult Dual-frequency dialing relies on two different frequencies to express a digit, such as using 697Hz and 1209Hz to represent the digit 1, and 852Hz and 1336Hz to represent the digit 8, etc All sounds are within the normal range of human hearing, so as long as one is trained, it is not difficult Moreover, regarding the answers of @Zhu Huanjie, pulse dialing is pulse