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  1. E

    LTspice, Warning node is floating

    Any diode symbol that is a defined by a .subckt should have its prefix changed to X. BTW Diode V104 does not have a value specified...
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    Creating a Simple Logic Device

    Do you have a volt/ohm meter? You can simply check continuity between the terminals while operating the switch
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    Single Digit Seven Segment Display Scoreboard HELP!!

    Hi So...tell me a little about your breadboard circuit. There are three display circuits that are close to the same. Did you wire one display circuit? All three? the whole circuit? Is each LED displaying a "zero" or "eight"?
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    LTspice, Warning node is floating

    One problem is the Mosfet model. CTL+RHT-CLK on symbol, then change the "prefix" attribute to "X", without quotes. Save schematic, close, re-open. There is an additional problem with the VIPER model. Zip up the model files (.mod and .asy for each) and the LTspice .asc file so we can...
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    LTspice, Warning node is floating

    Post an image of the schematic and the schematic.asc file
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    momentary +12VDC on input to flip the polarity of +12VDC on output for 10 seconds

    Hi You could replace 2 LM555's with a single LM556 and save a chip. If you really want the timeouts adjustable, replace the timing resistors with pots.
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    LTspice, Could not open library file

    There may be an absolute path embedded in the .asy file. In ltspice, open the .asy file and check the attributes. Remove any absolute path's.
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    Single Digit Seven Segment Display Scoreboard HELP!!

    Yes...it is for the decimal point and is not used. Its a common anode display so it should be connected, either to +V, or just leave unconnected so it won't light up. Its mapped the same as the datasheet (shown in the bottom right corner) Your mapping looks right. Pins 3 and 8 should both be...
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    Problem in LM2576 circuit

    How about showing the LM2576 schematic?
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    Simple power supply?

    LTspice is capable of that...but I didn't model the LM350 to include temperature simulation:) That would take a lot more effort. The best I could do for now is just show the drop with decreasing input voltage. I would have felt better if the OP had used a transformer with at least a 14v output. :(
  11. E

    Simple power supply?

    Just sayin....:cool:
  12. E

    Simple power supply?

    Don't need to...its on the datasheet. Fig 6 "Dropout voltage". Its closer to 2V but should leave some headroom...
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    Simple power supply?

    Here is a simulation with single LM350. The bottom plot show the load increased in 500ma steps.
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    Simple power supply?

    Using two LM350's won't work. Each regulator will drop about 3 volts.
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    Single Digit Seven Segment Display Scoreboard HELP!!

    Looks ok. ok.. Its up to you...its more of a convenience but you don't really need it. It's purpose is what it sounds like...it applies power to all LED segments so you can see they are all working. If you don't want it, you can just connect pin 14 of each 4033 to ground. Or you can just...
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    LM393 Comparator

    :D No worries. LTspice is awesome!
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    LM393 Comparator

    OK..
  18. E

    LM393 Comparator

    Hi Here's an example:
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    Single Digit Seven Segment Display Scoreboard HELP!!

    Yes..closest ground point. Yes Yeah...you still have to workout the wiring from the board to the LED displays.. OK...Sounds like a good plan...for now, lets focus on the bread boarding and get this working :)
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    Single Digit Seven Segment Display Scoreboard HELP!!

    No..C11 and c10 are the main power supply bypass caps. You only need one of each of those. Great questions!;)
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