Hi, I am trying to use EasyEDA and created a test project using 2n3904 transistor. But the sim results is way off my expectation. Here is the URL to the project: [https://easyeda\.com/editor\#id=\|453b6f20177b458490e819c012281c6c\|a73489478bf84f94955a83eed5dd728f](https://easyeda.com/editor#id=%7C453b6f20177b458490e819c012281c6c%7Ca73489478bf84f94955a83eed5dd728f) . According to the 2n3904 datasheet, it should have BetaDC at around 100. However, no matter how I tune the resistors, I always got the following result from the simulator. I particularly don't understand how the Vbe(<span class="colour" style="color: rgb(85, 85, 85);">-8.11e+00) and </span>Ic(-4.16e-04) could be negative as showing below. Can someone shed a light on this problem? Any advice would be appreciated! Direct Newton iteration for .op point succeeded. Semiconductor Device Operating Points:                         --- Bipolar Transistors --- Name:       q1 Model:    2n3904 Ib:       8.37e-05 Ic:      -4.16e-04 Vbe:     -8.11e+00 Vbc:      6.29e-01 Vce:     -8.73e+00 BetaDC:  -4.97e+00 Gm:      -1.29e-02 Rpi:      1.00e+12 Rx:       2.00e+01 Ro:       7.77e+01 Cbe:      3.54e-12 Cbc:      3.24e-09 Cjs:      0.00e+00 BetaAC:  -1.29e+10 Cbx:      0.00e+00 Ft:       6.31e+05