add .svg to README.md

2d847526 · 李川 · 0b8b6702 · 2d847526
--- a/README.md
+++ b/README.md
 # 说明
 DAC0832 数/模转换器
+# 原理图
+![DAC0832](https://www.codecode.net/engintime/Dream-Logic/Intel-classic-chips/DAC0832/raw/master/DAC0832.dlsche.svg)
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