Thanks for that , but there are still no photo transistors, transformers, variable capacitorsHere you can find all the additional models
http://tech.groups.yahoo.com/group/LTspice/
http://valvolodin.narod.ru/soft/extra.rar
http://forest22.homeip.net/Electronics/index.html
Unpack the archive "extra.rar", using the archive RAR
Copy "extra1.rar" which is installed in the directories are LTspiceIV. Typically, this directory is "C: \ Program Files \ LTC"
Unzip "extra1.rar" which is installed in the directories are LTspiceIV
How do i create a photo transistor, and motor?In LTSpice, go to File -> Open -> examples -> Educational; look at Transformer.asc, Transformer2.asc, and IdealTransformer.asc
Note that you can specify the resistance of a winding either directly in the inductor, or using an external resistor (like R1 in Transformer.asc); I prefer to use resistance in the inductor.
Note that in the coupling parameter:
Kn L1 L2 {...Ln} coupling
that you can specify less than 1 for coupling, but it will take far longer for your simulation to complete. I usually simply specify 1 for coupling.