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LTspice sim of Two transistor forward wont run.."singular matirx" error

alec_t

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Most Helpful Member
It ran for me (albeit so slowly I gave up after ~2mS), with "skip initial operating point solution" checked. At what sim stage did you get the error message?
 

alec_t

Well-Known Member
Most Helpful Member
This is what I'm seeing at what I assume is the output :-

TwoTran.jpg

Is that what you expect? What do you mean by 'not working'?
 

alec_t

Well-Known Member
Most Helpful Member
I suggest you divide the circuit into manageable chunks, sim each chunk separately and hope to identify the chunk that's causing the problem.
 

unclejed613

Well-Known Member
Most Helpful Member
usually if LTSpice has trouble establishing a stable operating point (errors are usually "time step too small, singularity matrix node(node-name)", or veeeeeery slooooow operation, it's because there's something causing the circuit to be unstable, such as positive feedback connected somewhere that expects negative feedback.
 

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