Simpler circuits LTspice

this site contains several simple circuits for operation on LTspice. the categories covered include, some really simple circuits, simpler filters, the common emmitter amplifier, and op amps and comparators.
in case of difficulty downloading, there are some zip files at the end of some of the lists.

Circuits driven with a sine wave.













Circuits driven with a square wave.

the first two circuits here are to show the impracticality of driving a capacitor with a voltage square wave
and driving an inductor with a current square wave.








Simpler filters









Common emmitter amplifier






Simpler op amp and comparator circuits




Simpler logic gate and flip flop circuits

Simpler radio recievers, crystal set, and TRF.




A really simple smps power supply.