Simulating an Astable Multivibrator - English

Questions posted on ST Forums:

• Simulating astable multivibrator

  upon clicking the simulate option in esim, the application closes automatically. Unable to perform simulation,how to resolve this issue?

  10-11M 0-10S Mothish
  
  
  Answer last updated on: June 9, 2025, 4:13 p.m.

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• About Converting KICAD to ngspice

  In the tutorials, a particular value is taken for the analysis, and for the source, can we change the values other than putting the same values which is shown in the Tutorial, if we can choose our own values what are the conditions or rules we should follow?

  07-08M 50-60S tarakratna1301
  
  
  Answer last updated on: Oct. 9, 2023, 5:46 p.m.

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• SIMULATION

  After doing the same procedure as shown in the video , unable to get the same simulation waveforms as shown in tutorial, it is showing a straight line.

  09-10M 0-10S priya___123
  
  
  Answer last updated on: June 6, 2022, 11:02 p.m.

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• Use of power falg

  Sir, why we haven't used the power flag in the ground wire in the schematic editor whereas we did the same operation for RC circuit's schematic's ground?

  08-09M 30-40S sc256356
  
  
  Answer last updated on: May 31, 2022, 1:31 p.m.

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• couldn't open the schematic diagram

  couldn't open the astablemultivibrator project on esim. Its throwing the error message as , "Error: The project doesn't contain any .Proj file. Please select the proper project directory else you won't be able to perform any operations." I couldn't even open the file normally which is saved withe the extension ".sch" and if I open normally its redirecting me to the Autodesk Eagle screen, where its asking me to sign in or create an account. How should I go further? 

  03-04M 20-30S Swarna10
  
  
  Answer last updated on: Oct. 20, 2021, 12:28 p.m.

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• unable to read analysis file

  while simulating 555 astable multivibrator the following error shows up. I have checked all the connections in the schematic and found nothing wrong and the error persists. Can u please tell me what the error means in any circuit and how to rectify it. 

  08-09M 20-30S kalyanicc
  
  
  Answer last updated on: July 9, 2021, 8:13 a.m.

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• How to get library files?

  When i am doing exercise, in device modeling when add button is clicked library files will not appear for diode transistor 

  12-13M 40-50S joshiniki731@gmail.com
  
  
  Answer last updated on: May 28, 2020, 6:53 p.m.

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• Simulation fault

  I'm unable to get the same simulation output as shown in the tutorial 

  11-12M 50-60S Mounikabukkuru
  
  
  Answer last updated on: May 23, 2020, 5:07 p.m.

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• Unable to reun simulation of 555 astable multivibrator

  Dear Sir,I am unable to run simulation of 555 Astable Multivibrator. The error given in the file as shown below:******** ngspice-31 : Circuit level simulation program** The U. C. Berkeley CAD Group** Copyright 1985-1994, Regents of the University of California.** Please get your ngspice manual from http://ngspice.sourceforge.net/docs.html** Please file your bug-reports at http://ngspice.sourceforge.net/bugrep.html** Creation Date: Oct  6 2019   15:17:58******Circuit: * c:\fossee\esim\examples\astable555\astable555.cirError on line 0 :  ) unknown device type - error Reducing trtol to 1 for xspice 'A' devicesDoing analysis at TEMP = 27.000000 and TNOM = 27.000000Warning: Too many analog/event-driven solution alternationsTransient solution failed -Last Node Voltages------------------Node                                   Last Voltage        Previous Iter----                                   ------------        -------------v_out                                             5                    5net-_r1-pad1_                                    10                   10net-_r1-pad2_                               9.99507              9.99507c_out                                       9.94573              9.94573net-_c2-pad1_                               6.67761              6.67761x1.18                                      -65986.8             -65986.8x1.23                                       3.34705              3.34705x1.9                                            0.2                  0.2x1.2                                            0.2                  0.2x1.20                                      -65986.8             -65986.8x1.17                                       32681.2              32681.2x1.19                                       32681.2              32681.2x1.11                                             5                    5x1.12                                             0                    0e.x1.e1#branch                                    0                    0e.x1.e2#branch                                    0                    0v1#branch                              -0.000669411         -0.000669411a.x1.a4#branch_1_0                                0                    0a.x1.a3#branch_1_0                                0                    0a.x1.a6#branch_1_0                         4.03e-12             4.03e-12a.x1.a5#branch_1_0                           -0.005               -0.005doAnalyses: Too many iterations without convergencerun simulation(s) abortedError(parse.c--checkvalid): c_out: no such vector.Error(parse.c--checkvalid): a.x1.a3#branch_1_0: no such vector.Error: no such vector v(v_out)Error: no such vector v(c_out)ngspice 1 -> 

  12-13M 40-50S prof.abpatil@gmail.com
  
  
  Answer last updated on: May 10, 2020, 9:55 a.m.

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• getting error in ngspice

  not getting outputError: bad v() syntaxError: bad v() syntaxError: bad v() syntaxngspice 1 -> 

  09-10M 20-30S skibrar
  
  
  Answer last updated on: April 30, 2020, 11:07 a.m.

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• Simulating 555 based astable multivibrator

  Hello Madam/SirAm getting run time error while simulating 555 based astable multivibrator.  Have tried best, am not able to resolve the error.  Have verified the simple ckt simulation in LT Spice, and apparently it works.  Please do help in resolving the doubt.  Am attaching herewith in-line the .out file* c:\\users\\prasad.joshi\\esim-workspace\\astable555\\astable555.cir.include lm555n.sub* u2 net-_c1-pad1_ ic.ic v(net-_c1-pad1_)=0x1 gnd net-_c1-pad1_ net-_r3-pad1_ net-_r1-pad1_ net-_c2-pad1_ net-_c1-pad1_ net-_r1-pad2_ net-_r1-pad1_ lm555nr2 net-_r1-pad2_ net-_c1-pad1_ 10kr1 net-_r1-pad1_ net-_r1-pad2_ 1kc1 net-_c1-pad1_ gnd 1uc2 net-_c2-pad1_ gnd 0.01ur3 net-_r3-pad1_ gnd 1k* u1 net-_r3-pad1_ plot_v1v1 net-_r1-pad1_ gnd dc 5* u2 net-_c1-pad1_ ic.tran 5e-03 4e-03 0e-00* Control Statements.controlrunprint allv > plot_data_v.txtprint alli > plot_data_i.txtplot v(net-_r3-pad1_).endc.enderror reported is:doAnalyses: iteration limit reachedrun simulation(s) abortedError(parse.c--checkvalid): net: no such vector.Error(parse.c--checkvalid): a.x1.a3#branch_1_0: no such vector.Error: bad v() syntaxngspice 1 -> Interrupted once . . .Warning: clearing control structuresngspice 1 -> Thanks indeedregards

  00-01M 0-10S prasadjoshee
  
  
  Answer last updated on: April 28, 2020, 10:19 p.m.

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• Simulating 555 based astable multivibrator

  Hello Madam/SirAm getting run time error while simulating 555 based astable multivibrator.  Have tried best, am not able to resolve the error.  Have verified the simple ckt simulation in LT Spice, and apparently it works.  Please do help in resolving the doubt.  Am attaching herewith in-line the .out file* c:\\users\\prasad.joshi\\esim-workspace\\astable555\\astable555.cir.include lm555n.sub* u2 net-_c1-pad1_ ic.ic v(net-_c1-pad1_)=0x1 gnd net-_c1-pad1_ net-_r3-pad1_ net-_r1-pad1_ net-_c2-pad1_ net-_c1-pad1_ net-_r1-pad2_ net-_r1-pad1_ lm555nr2 net-_r1-pad2_ net-_c1-pad1_ 10kr1 net-_r1-pad1_ net-_r1-pad2_ 1kc1 net-_c1-pad1_ gnd 1uc2 net-_c2-pad1_ gnd 0.01ur3 net-_r3-pad1_ gnd 1k* u1 net-_r3-pad1_ plot_v1v1 net-_r1-pad1_ gnd dc 5* u2 net-_c1-pad1_ ic.tran 5e-03 4e-03 0e-00* Control Statements.controlrunprint allv > plot_data_v.txtprint alli > plot_data_i.txtplot v(net-_r3-pad1_).endc.enderror reported is:doAnalyses: iteration limit reachedrun simulation(s) abortedError(parse.c--checkvalid): net: no such vector.Error(parse.c--checkvalid): a.x1.a3#branch_1_0: no such vector.Error: bad v() syntaxngspice 1 -> Interrupted once . . .Warning: clearing control structuresngspice 1 -> Thanks indeedregards

  00-01M 0-10S prasadjoshee
  
  
  Answer last updated on: Nov. 20, 2019, 9:02 a.m.

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• Error while simulating

  Iam getting this error at the last stage of the simulationnet-_22u2-pad2_                        0.66254net-_d2-pad2_                          8.99992net-_22u2-pad1_                     0.00459836net-_22u1-pad1_                     0.00398599v1#branch                          -0.00842022No. of Data Rows : 1208Error: bad v() syntaxError: bad v() syntaxngspice 1 -> Interrupted once . . .Warning: clearing control structuresngspice 1 ->

  11-12M 10-20S paragvpuranik
  
  
  Answer last updated on: Sept. 21, 2019, 4:32 p.m.

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• error in simulation

  after analysis of astable multivibrator source details are blank so what i do next

  12-13M 30-40S Vikas_123
  
  
  Answer last updated on: Sept. 21, 2019, 4:27 p.m.

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• LED.lib not found

  When Converting KiCad netlist to ngspice netlist, while adding libraries to LED, LED.lib not found!! (schematic drawn own, not taken from Examples)..Pls help!

  09-10M 10-20S arunps
  
  
  Answer last updated on: Sept. 21, 2019, 3:04 p.m.

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• Error type 3: pin connected to some other pin

  with conventional 3 global errors I get Error type 3: pin connected to some other pin

  07-08M 0-10S jagdish351
  
  
  Answer last updated on: Sept. 21, 2019, 2:58 p.m.

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• Errors except Global Labels

  Pin connected to some other pin extra error is coming but no pin to drive it

  07-08M 50-60S sachin.nerkar
  
  
  Answer last updated on: Sept. 21, 2019, 2:58 p.m.

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• Difference between components

  while choosing components what is difference between normal npn transistor and eSim npn transistor? what difference it make in circuit working?

  01-02M 40-50S Kalpita2019
  
  
  Answer last updated on: Sept. 21, 2019, 2:54 p.m.

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• Your schematic contain unknown model out

  Receiving this error - Your schematic contain unknown model out.Kindly help!!!

  08-09M 40-50S sunilkhatri1919
  
  
  Answer last updated on: Sept. 21, 2019, 2:54 p.m.

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• Device files

  LED.lib file and BC547B.lib files are not found in library? What to do?

  09-10M 10-20S NAVAICE
  
  
  Answer last updated on: Sept. 21, 2019, 2:50 p.m.

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• Error while simulating a astable multivibrator

  \r\n\r\np, li { white-space: pre-wrap; }\r\n\r\nError while opening python plotting Editor. Please look at console for more details bash: ngspice : command not found

  11-12M 0-10S ahersandy
  
  
  Answer last updated on: Sept. 21, 2019, 2:47 p.m.

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• AnOTATION

  Unable to solve an issue in Electrical Rule Check at "conflict problem at pins" even after multiple trials. How to solve?

  08-09M 0-10S NAVAICE
  
  
  Answer last updated on: Sept. 21, 2019, 2:45 p.m.

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• simulation error

  Error in Simulation for astable multivibrator as \r\n\r\np, li { white-space: pre-wrap; }\r\n\r\nError while opening python plotting Editor. Please look at console for more details.

  12-13M 40-50S ushajadhav
  
  
  Answer last updated on: Sept. 21, 2019, 1:12 p.m.

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• pwr_flag

  why pwr_flag is not connected to gnd in astable multivibrator

  06-07M 30-40S deepu_nivas
  
  
  Answer last updated on: Sept. 21, 2019, 1:04 p.m.

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• Using schematic editor

  Whenever editing the parameter value of device, the schematic editor is freezing or dead. We need to click on the outside area of schematic editor.As for beginner, it is hard to connect the devices with wire, we need to be more carefully in connection. It is sometime loosing the connection with rectangle box and give the errors.

  03-04M 20-30S nuwar
  
  
  Answer last updated on: Sept. 21, 2019, 12:58 p.m.

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• global label

  is there possibilities of occurring of any error other then global label error?

  07-08M 50-60S gurdipbhatia
  
  
  Answer last updated on: Sept. 21, 2019, 12:56 p.m.

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• Simulating an astable Multivibrator

  after complition of circuit unable to open electrical parameter?

  09-10M 0-10S kapil_cs27
  
  
  Answer last updated on: Sept. 21, 2019, 12:49 p.m.

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• global error

  why should ignore global label error?

  07-08M 50-60S abhimylife
  
  
  Answer last updated on: Sept. 21, 2019, 12:48 p.m.

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• Not getting the correct output

  I have drawn the schematic and followed the instruction as per the video tutorial but I am Not getting the exact output graph after simulating it

  01-02M 10-20S bala237115
  
  
  Answer last updated on: Sept. 21, 2019, 12:45 p.m.

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• what is Device Modeling

  what to do in Device Modeling

  09-10M 30-40S Tarun
  
  
  Answer last updated on: Sept. 21, 2019, 12:30 p.m.

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• NPN transistor No.BC547B is not available

  Please help me out regarding issue

  09-10M 30-40S habiburrahman.ansari
  
  
  Answer last updated on: Sept. 21, 2019, 12:09 p.m.

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• Device Modeling

  After clicking the add file Didn't get the LED.Lib file and BC547.lib files. what is the solution?

  09-10M 30-40S travindra
  
  
  Answer last updated on: Sept. 20, 2019, 11:35 p.m.

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