holger, I changed the Alternatenode sequence to
3 2 8 4 1
but the simulation still doesn’t work.
With the Sim Parameters - Trasient set to
Time Step: 10u seconds
Final Time: 1 second
(and I’ve tried numerous Time Step and Final Time values)
And Compatibility Mode = LTspice
I get the following…
Compatibility modes selected: lt
Circuit: KiCad schematic
Reducing trtol to 1 for xspice 'A' devices
Doing analysis at TEMP = 27.000000 and TNOM = 27.000000
Note: Starting dynamic gmin stepping
Trying gmin = 1.0000E-03 Warning: Further gmin increment
Trying gmin = 5.6234E-03 Warning: Further gmin increment
Trying gmin = 8.6596E-03 Warning: Further gmin increment
Trying gmin = 9.6466E-03 Warning: Further gmin increment
Trying gmin = 9.9105E-03 Warning: Further gmin increment
Trying gmin = 9.9775E-03 Warning: Further gmin increment
Trying gmin = 9.9944E-03 Warning: Further gmin increment
Trying gmin = 9.9986E-03 Warning: Further gmin increment
Trying gmin = 9.9996E-03 Warning: Last gmin step failed
Warning: Dynamic gmin stepping failed
Note: Starting true gmin stepping
Trying gmin = 1.0000E-03 Warning: Further gmin increment
Trying gmin = 5.6234E-03 Warning: Further gmin increment
Trying gmin = 8.6596E-03 Warning: Further gmin increment
Trying gmin = 9.6466E-03 Warning: Further gmin increment
Trying gmin = 9.9105E-03 Warning: Further gmin increment
Trying gmin = 9.9775E-03 Warning: Further gmin increment
Trying gmin = 9.9944E-03 Warning: Further gmin increment
Trying gmin = 9.9986E-03 Warning: Further gmin increment
Trying gmin = 9.9996E-03 Warning: Last gmin step failed
Warning: True gmin stepping failed
Note: Starting source stepping
Supplies reduced to 0.0000% Note: One successful source step
Supplies reduced to 0.1000% Note: One successful source step
Supplies reduced to 0.2000% Note: One successful source step
Supplies reduced to 0.3500% Note: One successful source step
Supplies reduced to 0.5750% Note: One successful source step
Supplies reduced to 0.9125% Note: One successful source step
Supplies reduced to 1.4188% Note: One successful source step
Supplies reduced to 2.1781% Note: One successful source step
Supplies reduced to 3.3172% Note: One successful source step
Supplies reduced to 5.0258% Note: One successful source step
Supplies reduced to 7.5887% Note: One successful source step
Supplies reduced to 10.1516% Note: One successful source step
Supplies reduced to 13.9959% Note: One successful source step
Supplies reduced to 19.7624% Note: One successful source step
Supplies reduced to 28.4122% Note: One successful source step
Supplies reduced to 41.3868% Note: One successful source step
Supplies reduced to 60.8487% Supplies reduced to 41.3868% Note: One successful source step
Supplies reduced to 42.3599% Supplies reduced to 41.3868% Note: One successful source step
Supplies reduced to 41.4354% Note: One successful source step
Supplies reduced to 41.5084% Note: One successful source step
Supplies reduced to 41.6179% Note: One successful source step
Supplies reduced to 41.7821% Note: One successful source step
Supplies reduced to 42.0284% Note: One successful source step
Supplies reduced to 42.3979% Note: One successful source step
Supplies reduced to 42.9521% Supplies reduced to 42.3979% Warning: source stepping failed
Note: Transient op started
Transient solution failed -
Last Node Voltages
------------------
Node Last Voltage Previous Iter
---- ------------ -------------
/+vcc 0 0
net-_r1-pad1_ -0.000960353 -0.000960353
net-_r3-pad2_ -0.0201674 -0.0201674
/out -9.57286e-13 1.99455e-12
xu1.11 -0.0460973 -0.0460973
xu1.12 -0.0490531 -0.0490531
xu1.6 1.16701e+22 3.14347e+22 *
xu1.7 1.16659e+22 3.14304e+22 *
xu1.53 -2.7 -2.7
xu1.54 2.7 2.7
xu1.90 40.045 39.878 *
xu1.91 38 38
xu1.92 -38 -38
/-vcc 0 0
xu1.99 0 0
xu1.10 -0.681359 -0.681359
xu1.13 -0.66413 -0.66413
xu1.14 -0.65498 -0.65498
xu1.9 0 0
xu1.8 1.16659e+22 3.14304e+22 *
h.xu1.hlim#branch 8.52599e+19 9.49809e+19 *
v.xu1.vlim#branch 2.33317e+20 6.28608e+20 *
v2#branch 1.73158e+30 1.73158e+30
v.xu1.vln#branch -7.80458e-11 -7.78788e-11
v.xu1.vlp#branch -8.52599e+19 -9.49809e+19 *
v.xu1.ve#branch -1.73158e+30 -1.73158e+30
v.xu1.vc#branch -1.73158e+30 -1.73158e+30
v.xu1.vb#branch -3.85204e+16 -2.89579e+16 *
v1#branch 1.73158e+30 1.73158e+30
a$poly$e.xu1.egnd#branch_1_0 6.5424e+20 2.16518e+20 *
No. of Data Rows : 0
doAnalyses: TRAN: Timestep too small; initial timepoint: trouble with xu1:dx-instance d.xu1.dlp
run simulation(s) aborted
ML9104, It may not looklike it but the power supplies are connected. The wire is just short.
To check this I can click the +VCC or -VCC label and drag the wire out longer.
Any other help would be highly appriceated.
You have set the power supplies to dc 15 pulse 0 15 1u 1u 1u 10 10
(delay, rise time, fall time 1u), and then you have chosen a step time of 10u for the transient simulation. That’s not reasonable. You are also forcing ngspice to find an operating point with power supply voltages at 0V as a starting point for the transient simulation. For sure the data sheet will set a minimum operating voltage for the NE5532, and it may happen that its model is simply not made for power supplies 0V and thus will not converge.
So simplify the power supplies to dc 15
The compatibility mode should always be set to ‘PSPICE and LTSPICE’. This does not matter here, but would be essential for all modern OpAmp models.
