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Showing posts from July, 2022

sequential (31) no realistic serial circuit -FM Modulation (2)

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  https://wodewangzhishime.blogspot.com/2022/07/cai-yourong-spy.html . Ref:  https://chihaukam.blogspot.com/2025/09/blog-post.html?m=1 . .. . . John: There're 2 pictures above. Which one is correct. . Me: The 2nd picture is correct. . John: You're wrong. The 1st picture is correct. . Me: Why? . John: There's a circuit in the 1st picture.  This circuit is called Circuit A. In circuit A, the frequency is strange and unbalance. The left-side branch is 90Mhz. However, the right-side branch is 100Mhz.  Because, the right-side branch is 100Mhz. As a result, a electrical current of 100Mhz is induced in Circuit B. And then, it is horrible. Me: Why? John: Read the followings. . 1) The resonance frequency of circuit A is 80Mhz. (fc = 80) <---- fc stand for central frequency. . 2) The resonance frequency of cirucit B is 100Mhz. (fc + deviation = 100) . John: If an electrical current of 100 Mhz is induced in Circuit B,  indeed, between the inductor and capacitor of circu...

sequential (59) I2C and SPI protocol

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  https://wodewangzhishime.blogspot.com/2022/06/what-does-he-need.html . Ref:  https://chihaukam.blogspot.com/2024/01/chapter-17-of-bible-said-hackers-tool_22.html?m=1 . . John: There're plenty protocol of communications. You might have a look . //.  https://instrumentationblog.com/communication-protocols/ .   For example, RJ45, I2C, USB, SPI, and, so on and on.  Now, we use I2C as an example. Me: OK. John: At the picture above, do you see that there're 2 chips? They are Chip A and Chip B.  They use the interface of I2C to connect to each others.  Chip A is master. Chip B is slave. That mean Chip B must use the clock line of Chip A. Me: OK. . Inside Chip A, there're 2 clock line. 1) The clock line of RJ45 2) The clock line of system. . John: Then, which clock line does (the register of I2C of the master) choose? Me: Normally, (the register of I2C of the master) use the clock line of System. John: However, hackers hack it. It become . Subject [the...