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Niels Bartmann
Jan 28, 2023
In Bug Finding
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:
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Niels Bartmann
Dec 26, 2022
In Bug Finding
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:
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Niels Bartmann
Dec 24, 2022
In Development Suggestions
I'm trying to simulate a circuit with two different voltages (5V and 24V). I need to completely separate those two voltages. I can circumvent the limitation to 12V in CRUMB but the lack of optocouplers makes the complete separation impossible (at least at my level of knowledge). Would it be possible / is it planned to add optocouplers? Also fuses would be nice. FWIW, that is the project I'm working on / trying to improve: https://github.com/silen72/BusDashboard.
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Niels Bartmann
Dec 24, 2022
In Electronics/Circuitry
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):
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Niels Bartmann
Dec 23, 2022
In Development Suggestions
It would be really nice to see parts in your design that are about to heat up / overheat. Like with MOSFETs that may heat up although being used within their specification. Similar to those really helpful voltage / current views, maybe?
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Niels Bartmann
Dec 23, 2022
In Development Suggestions
I'd love to see the current value of a potentiometer when I select it. Even better would be to make it editable.
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Niels Bartmann
Dec 23, 2022
In Bug Finding
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. "
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Niels Bartmann
Dec 23, 2022
In Bug Finding
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.
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Niels Bartmann
Dec 23, 2022
In Bug Finding
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.
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Niels Bartmann
Dec 23, 2022
In Bug Finding
Windows / Steam version. When I save my design using ctrl-s the viewpoint moves as if I had pressed the s key alone. Not a (severe) bug, more like a quirk.
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Niels Bartmann
Dec 18, 2022
In Bug Finding
I've set a resistor to 10M (which the UI happily allowed). I am no longer able to interact with that resistor. After saving and reloading the build, the resistor displays as 1k but is still not clickable.
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Niels Bartmann
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