Warning: Singular matrix. Check nodes...Fatal error: Timestep too small(1.25e-19) at t=0


tes.qsch (28.2 KB)

output window give all necessary information for you, you have floating nodes.
add a huge resistance of these nodes to GND to resolve this problem.
tes.qsch (30.7 KB)

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Nice DAB, I was having trouble with the transformer L=INF, maybe try setting to L=<something != inf>