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Hello - please help. Solver returns no data - time domain simulation What is wrong with htis circuit - why do I get no data.

Thanks

https://www.circuitlab.com/circuit/v6zmvpfx5y8q/lichtschranke/

I was able to make one step forward by deleting the node "+15V", then the Time-Domain simulation would run. (I have no explanation for this).

Then, I increased the simulation time from 3 to 30 seconds. 3 cycles of voltage source V2 appeared.

Finally, I looked at the voltages on R2 and C2. The signals are small, probably not enough to switch the NAND gates. Try thinking about the value of R1.

Keep experimenting!