Please help analyze how the values of resistors R5, R6, R8, B9, and capacitors C8 and C9 are calculated in this low-frequency card circuit.

一沙一世

Please help analyze how the values of resistors R5, R6, R8, B9, and capacitors C8 and C9 are calculated in this low-frequency card circuit. [Copy link]

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The following figure is the card reader and writer circuit of T5577 card.

1. Please help analyze how the values of resistors R5, R6, capacitors C8, and C9 are calculated in this low-frequency card circuit.

2. Since C9 already generates the envelope, why do we need to add C8 in front of it? What is the function of C8?

3. How are the values of R8 B9 calculated?

乱世煮酒论天下

We often see circuit structures like R6 C9. What role does it play?

一沙一世

Luan Shi Zhu Jiu Lun Tian Xia published on 2024-6-1 10:04 I often see the circuit structure of R6 C9. What is its role?

You are not here to eliminate posts with zero replies too, right? Just tell me openly which moderator you are representing. If you can't answer, then don't answer. Don't try to meet the quota against your conscience.

乱世煮酒论天下

Yishayishi posted on 2024-6-1 11:35 You are not here to eliminate the zero-reply posts, are you? Just say which moderator you are acting for. If you can't answer, then don't answer. Don't ask your conscience...

I just want to know the function of this RC parallel structure, which is neither low-pass nor high-pass.

chunyang

I suggest you check out the old post first. You asked this question a few years ago, and I told you what you should do a long time ago...

一沙一世

chunyang posted on 2024-6-1 23:03 I suggest you check out the old post first. You asked this question a few years ago, and I told you what you should do...

Excuse me, if you have learned computer principles, can you build a computer? Since you can, please help me answer it first.

[How are the values of resistors R5, R6 and capacitors C8 and C9 calculated]

I'm afraid that there are not many people in this forum who can answer this question. It's not just about understanding the principle, but also about being able to actually do the math.

一沙一世

chunyang posted on 2024-6-1 23:03 I suggest you check out the old post first. You asked this question a few years ago, and I told you what you should do...

Thank you. According to the reply from teacher Maychang , this question is beyond the scope of second-order differential equations, and you may not be able to answer it at all.

maychang

Yishayishi published on 2024-6-5 15:23 Thank you. According to the reply of teacher maychang, this question is beyond the scope of second-order differential equations, and you may not answer it at all...

[This question is beyond the scope of second-order differential equations, and you may not be able to answer it at all]

You got it wrong.

According to chunyang's suggestion on the 5th floor, check the old posts.

一沙一世

maychang posted on 2024-6-5 15:41 [This question is beyond the scope of second-order differential equations, you may not be able to answer it at all] You are wrong. According to the suggestion of chunyang on the 5th floor, ...

Please tell me what went wrong.

maychang

Yishayishi published on 2024-6-6 11:56 Excuse me, what is wrong.

[Excuse me, what went wrong? ]

What you got wrong is this sentence: "You may not be able to answer it at all."