Why Lm7905 give positive voltage instead negative in Lt-spice simulation at EasyEda software?
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elasa group 1 week ago
Hi: I have selected the Lm7905 and lm7909 in simulation mode like this: ![image](https://i.stack.imgur.com/T3gxm.png) Which could be seen here: [https://easyeda\.com/editor\#mode=sim\,id=\|1f8d2e91e71e4daeba70b25b2bc15fa6\|4b4839cf2c8c497b981f4f62a1a04f0a\|310de4f753f3458f88e92d9f05ab0594](https://easyeda.com/editor#mode=sim,id=|1f8d2e91e71e4daeba70b25b2bc15fa6|4b4839cf2c8c497b981f4f62a1a04f0a|310de4f753f3458f88e92d9f05ab0594) So as you could see the multi meters have the same 5V and don't show -5V or -9V? Alternative link: [https://electronics.stackexchange.com/questions/465970/why-lm7905-give-positive-voltage-instead-negative-in-lt-spice-simulation-at-easy](https://electronics.stackexchange.com/questions/465970/why-lm7905-give-positive-voltage-instead-negative-in-lt-spice-simulation-at-easy) Thanks.
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elasa group 1 week ago
it have been solved because of my [mistake](https://electronics.stackexchange.com/questions/465970/why-lm7905-give-positive-voltage-instead-negative-in-lt-spice-simulation-at-easy?noredirect=1#comment1176181_465970) in using LM79XX : > The LM79xx requires a **negative** input voltage, not positive.
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elasa group 1 week ago
So have can i change the question to Solved?
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andyfierman 1 week ago
I think you can just edit the title to add [Solved]:
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你现在访问的是EasyEDA海外版,使用建立访问速度更快的国内版 https://lceda.cn(需要重新注册)
如果需要转移工程请在个人中心 - 工程 - 工程高级设置 - 下载工程,下载后在https://lceda.cn/editor 打开保存即可。
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