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急!120K左右的脉冲信号转换成开关信号
2007-7-8 13:24
- 新手园地
- 9
- 2057
![](https://bbs.21ic.com/static/image/common/icon_quote_m_s.gif)
![](https://bbs.21ic.com/static/image/common/icon_quote_m_e.gif)
可以只靠减小基极电阻来使三极管工作在饱和区吗
2007-7-7 11:59
- 新手园地
- 1
- 1534
![](https://bbs.21ic.com/static/image/common/icon_quote_m_s.gif)
![](https://bbs.21ic.com/static/image/common/icon_quote_m_e.gif)
哪位可以给介绍一下NE555的功能,谢谢!
2007-7-8 09:05
- 新手园地
- 10
- 2709
![](https://bbs.21ic.com/static/image/common/icon_quote_m_s.gif)
![](https://bbs.21ic.com/static/image/common/icon_quote_m_e.gif)
请教一个整流器充电的问题
2007-7-19 19:13
- 电源技术
- 17
- 1902
![](https://bbs.21ic.com/static/image/common/icon_quote_m_s.gif)
![](https://bbs.21ic.com/static/image/common/icon_quote_m_e.gif)
关于光耦驱动24V继电器的问题
2007-6-22 18:00
- 电子技术交流论坛
- 11
- 8840
![](https://bbs.21ic.com/static/image/common/icon_quote_m_s.gif)
![](https://bbs.21ic.com/static/image/common/icon_quote_m_e.gif)
电池给仪器供电,在电池的输出端有必要加滤波电容么?
2007-6-29 15:54
- 电源技术
- 17
- 3956
![](https://bbs.21ic.com/static/image/common/icon_quote_m_s.gif)
![](https://bbs.21ic.com/static/image/common/icon_quote_m_e.gif)
永磁交流同步电机如何初始定位??
2007-6-22 10:08
- 电子技术交流论坛
- 3
- 1587
![](https://bbs.21ic.com/static/image/common/icon_quote_m_s.gif)
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