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I found the MC34063 moden in the eevblog forum: link
How can I add it to the LTSpice to if I want to make a buck or boost converter it appears in for.example in the power product list?
Copy the .asy file to the location where the LTspice symbol files are kept, I.e., C:\Users\Me\Documents\LTspiceXVII\lib\sym, and the .lib to C:\Users\Me\Documents\LTspiceXVII\lib\sub. Restart LTspice.
Required, but never shown