The above picture is the optocoupler input circuit that I often use. I have never studied it before.
Question 1: What is the purpose of the 300 ohm resistor R2 in the circuit?
Question 2: After the sw
I recently looked at the arm7 code and saw the interrupt function void _irq IRQ_Expection(void). What I want to ask is what is this "_irq"? ? ? ? Has it been defined before? ? ? ?
[font=黑体][size=3] Waiting online, may I ask how to modify the circuit in the figure to make it output a sine wave (waveform range 700~800hz) [/size][/font] [font=黑体][size=3] condition, use 555 generat
The system I designed in the project needs to be updated online. It is a DSP-based system. That is, the algorithm program and parameters in the configuration can be updated through the host computer t
Original address: [url]http://cn.tycc.cn/news/guoneixinwen/2014-09-27/189.html[/url] Tongyu Communication is Huawei's antenna supplier, with great technology. [table=98%] [tr][td] 1. Introduction Comp