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sharpie7 / circuitjs1

Electronic Circuit Simulator in the Browser
GNU General Public License v2.0
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NPN transistor is closed, but throw current #712

Closed MikePryadko closed 2 years ago

MikePryadko commented 2 years ago

image

Vbe = 89.7 mV, Ib = -17.94 uA, but Ic = 9.185 mA -- it's impossible :neutral_face:

schematic text ``` $ 1 0.0000049999999999999996 10.20027730826997 50 20 50 5e-11 f 784 432 848 432 32 1.5 100 r 848 448 848 512 0 8 g 848 512 848 528 0 0 R 848 416 848 336 0 0 40 29 0 0 0.5 r 896 448 896 400 0 1 c 896 400 896 368 0 0.000001 -9.276152783846982 0.001 R 896 336 896 304 0 0 40 10 0 0 0.5 d 896 336 896 368 2 1N4148 w 848 448 896 448 0 w 896 368 784 368 0 r 784 368 784 432 0 1000 t 752 448 784 448 0 1 -0.0010764116127125745 0.08970096770354627 100 default g 784 464 784 480 0 0 r 752 448 704 448 0 5000 R 704 448 656 448 0 2 40 5 5 3.141592653589793 0.5 O 784 432 720 352 1 1 O 896 368 960 336 1 1 O 704 448 656 512 1 1 o 14 8 0 4098 10 0.1 0 2 14 3 o 15 8 0 4098 0.625 0.1 0 1 o 16 8 0 4098 10 0.1 0 1 o 1 8 0 4098 10 1.6 0 2 1 3 ```
pfalstad commented 2 years ago

Hmm, if you look at the console, it seems that the simulator is having a lot of trouble converging. So maybe it's related to that. If you take out the diode, replacing it with a wire, it works better.

colinhowell commented 2 years ago

Yeah, it does look convergence-related.

Replacing the diode with a wire seems to work OK, but replacing it with a resistor does not unless the resistance is very low (7 ohms or less).

On Fri, Jan 21, 2022 at 10:45 AM Paul Falstad @.***> wrote:

Hmm, if you look at the console, it seems that the simulator is having a lot of trouble converging. So maybe it's related to that. If you take out the diode, replacing it with a wire, it works better.

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