![]() ![]() Either that or the internal resistances are very small. SInce that NPN has an Ic=1A, it means that the default values for the Falstad transistor are quite generous. This LTSpice result has 3.9 uA Ib and 0.39 mA Ic. ![]() If you choose a model from LTspice's database (right-click on the transistor, Pick New Transistor) and choose 2SCR293P (for example), the values will come closer to what you see in the Falstad simulator. As well as standard PNP and NPN Darlington transistor pairs, complementary Sziklai Darlington transistors are also available which consist of separate matching NPN and PNP complementary transistors connected together within the same Darlington pair to improve efficiency. SInce that NPN has an Ic1A, it means that the default values for the Falstad transistor are quite generous. ![]() I can't tell you which values are for Falstad, but, clearly, they are different. In LTspice's case, you can see which values are by looking in the help at LTspice > Circuit Elements > Q. A comparison of ionizing radiation induced gain degradation in a lateral, substrate and vertical pnp bipolar junction transistors is reported by Schmidt et.al (. ( edit) The reason why you see different numbers is because the default values differ, as mentioned in the comments, too. That's because, the way you set it up, you're running a "sweep" from 0.75 V to 0.75 V, in steps of 0.75 V, which translates to one point, only, which means LTspice will consider that as another way of spelling. dc op point with the command you have in the picture only brings up the error log just like in my screenshot. This is a completely editable PowerPoint presentation and is available for immediate download. ![]() Also, I don't know what you did before, but running a. ![]()
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