I tried chaining two 12V power sources to achieve 24V at the resistor (1k, 0.25W). I got this: There are a few issues here: 1) The amperage on the left power source is obviously wrong. There is no way the resistor could draw 1.2A. 2) Applying the scope to the resistor, it shows 12V, 12mA which is half of the expected with both figures. Crumb does not seem to add the voltages of the two power supplies. 3) No warning is given that the resistor exceeds 0.25W (probably a resulting error) Just to be sure, I checked with LTSpice. I took two 12V inputs, chained them and fed their output to a 1k, 0.25W resistor. The simulation gave a steady line at 24.0 mA, just as expected:

As you might see in the miniature, there are two transistors and an arduino in this design: Upon loading the design, one transistor is missing (1). And the arduino (2) is gone, too (including my luckily not so sophisticated sketch): The right transistor (3) highlighted in white cannot be interacted with and stays even when creating a new design (to get rid of it CRUMB needs a restart): Maybe my save could aid in debugging:

It seems, there is an implicit common ground for all power supplies. Otherwise this (the rightmost part of the design) should not work (but it does): Is this intentional? Or is it another simulation artifact? In reality I'd expect the circuit to only function when built like this (note the additional connection between 12V GND and 5V GND):

Some of the example explanations seem to contain typos (or maybe not? I'm not a native speaker, so please bear with me): This is probably meant to say "Circuitry" This is supposed to be "There are a variety...", isn't it? The Multiplexed Display circuit contains an IC "74LS76" that is neither addable via the EMBEDDED menu nor does it have attributes, explanation or anything when selected. "

Windows/ Steam. I created a full bridge rectifier. To flatten the resulting voltage, the circuit needs capacitors. I can add two capacitors, as long as they are not in the same "column": Upon adding a third capacitor in parallel either on the upper power rail or in the led's "column", I get a warning: I'm pretty convinced those warnings are false negatives.

I have made a simple design for tinkering with the ne555. It works as expected: Then I wanted to add a few things, starting with a switch. Upon adding it, I get this: This seems pretty odd to me. The part I added is connect to one leg of the NE555. But it is not connected to anything else. So this warning should not happen. When I move the switch one contact point to the right (so it is not connected to anything) the warning disappears. Strangely, when I switch it off there and move it back, the warning does NOT appear. The warning DOES reappear when the switch is on.