What kind of model engines can an electrical engineer design?

[Maurogaetano]

How did you find PF?

google

I like math and physics and sometimes I pose myself a question for which I try to get an answer.
For a more practical hobby I build model engines
Use to design Power Supply and telephone equipment like modems, trunk interfaces and signaling apparatus.

 

[berkeman]

Welcome to PhysicsForums from a fellow EE.

 

[Maurogaetano]

Thanks