# DC/DC converter from 9V to around 180V - LTspice simulation

I am trying to simulate circuit from link: Nixie power supply, but I have come into some problems. I downloaded MC34063 from this forum and example in package is working perfectly. Below is my circuit in LTspice. But for my circuit there is no oscillation on swe output so Q1 and M1 is constantly in one state. As output voltage I got 3.6 V.

Here is digital version of my schematic file: circuit + mc34063 model

What am I missing? Not working is caused by wrong components, different from schematic? I don't get something about LTspice?

I am new to electronic and just pick this as exercise.

• For the future, sharing a schematic should be done together with all the custom symbols and libraries, since not everybode has them. In your case, you should have also packed the symbol for the MC34063 (the .asy file), and the library (.lib), zipped (since it's quite universal). When in doubt, keep a clean installation of LTspice elsewhere, untouched, and try to open the schematic you're about to send as if you were the receiver. – a concerned citizen Jan 11 at 8:11
• @aconcernedcitizen good point - I have edited my post. – Nichten Jan 12 at 17:04