电子发烧友

protel里电路原理图是分好几页画的，如何将这几页原理图放置在一个PCB里呢？

2014-03-07 09:30

接线方式dp dm gnd 连pc usb 焊接好上电之后 连接上usb之后usb 串口一直打印 invalid header: 0xffffffff invalid header: 0xffffffff invalid header: 0xffffffff invalid header: 0xffffffff invalid header: 0xffffffff invalid header: 0xffffffff 并且不断重启 按住CHIP_PU 按键 和 GPIO0 按键(均为下拉)然后使用flash download tool 下载 bin文件LOG如下 Uploading stub... Running stub... Stub running... Changing baud rate to 115200 Changed. NO XMC flashdetected! SPI_BOOT_CRYPT_CNT 0 SECURE_BOOT_EN False Compressed 15040 bytes to 10333... Compressed 3072 bytes to 146... Compressed 1023376 bytes to 335558... is stub and send flash finish 使用vscode+pio 下载 LOG如下 CURRENT: upload_protocol = esptool Looking for upload port... Using manually specified: COM21 Uploading .piobuildset-meterfirmware.bin esptool.py v4.5 Serial port COM21 Connecting.... Chip is ESP32-S3 (revision v0.2) Features: WiFi, BLE Crystal is 40MHz MAC: ec:da:3b:63:2b:64 Uploading stub... Running stub... Stub running... Changing baud rate to 921600 Changed. A serial exception error occurred: Cannot configure port, something went wrong. Original message: FileNotFoundError(2, '系统找不到指定的文件。', None, 2) Note: This error originates from pySerial. It is likely not a problem with esptool, but with the hardware connection or drivers. For troubleshooting steps visit: https://docs.espressif.com/projects/esp ... oting.html *** [upload] Error 1 截图如下

2024-06-28 06:36

我用两块vca821级联，想扩大电压增益范围，按照下面的原理图制作pcb后，测试时第一级输出波形没有问题，但是VG给2v电压时，电压增益没有达到最大理论20db，而是只有8db左右。第二级完全没有输出。求解答。

2024-08-27 06:21