Here's an outline of how to get dangerous with LTSpice:

Download the free LTSpice from Linear Tech:
? ??
It primarily targets the various MSoftWindows operating systems.
They also have a version out now for Mac OS-X.
Will run under linux with Wine.

Also download this file:??

Kick off LTSpice.
Click File, then Open, browse for that ubitx_pa.asc file you just downloaded.
Should display a schematic of Q90 on out through the finals for the uBitx.

Click the RunningMan menu icon (5 over from the left edge) to run the simulation.
It should open a second window to show waveforms, but the window will be empty.
Click on nodes in the schematic to see the voltage waveform at that point.
Double clicking will erase all other waveforms and just show the last one selected.
Click where wires enter into part symbols to see currents there.

Edit part values by clicking on that value.
Edit wires by using the Scissors icon to cut away wires, then using the Pencil icon?
to add new wires.? (You first have to click somewhere in the schematic to select that window.)
You can add grounds, caps, coils, resistors and diodes by clicking on their icon in the menu bar.
Click the AND-GATE icon to explore the various other parts available to you.

Someday, click the Help menu item, browse the destructions.

LTSpice is an incredible gift from LinearTech to the electronics hobbyist and professional engineer.
It has a full catalog of the various LinearTech products and complete demo circuit simulation models for each.
Fortunately, it is also a first rate generic analog simulator with an easy to use interface.

Jerry, KE7ER


On Thu, Jun 7, 2018 at 09:37 am, Jerry Gaffke wrote:

I'm not one that takes easily to new tools,?
but found LT-Spice easy to get started with.
Changes can be hacked in and checked faster than it takes for my soldering iron to heat up.
You can easily instrument voltage, current, power dissipaton, and much more.
It's worth a couple hours of fiddling with to get started.
I'm no expert, but let me know if you get hung up on those first steps.