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  1. #1
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    Proteus: timestep too small on a basic circuit

    Hi.

    I would like to know what im doing wrong on this circuit cause I got an error: ([SPICE] TRAN: Timestep too small; timestep = 0.0133112: trouble with node #D1_S2#branch) and this is the most basic circuit I can make. I made some circuit whit many Ic and still simulate fine but this I cant :(

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    Thank you

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  2. #2
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    Re: Proteus: timestep too small on a basic circuit

    I'd first look at the "switch" element and its properties. If it
    has properties for on and off resistance, for control VH/VL
    then make sure these are finite / sane. SPICEs have a hard
    time with zero and infinite resistances, and divide-by-zero
    transfer functions (i.e. flips from on to off with a zero voltage
    step, like VH=VL=1.0).



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  3. #3
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    Re: Proteus: timestep too small on a basic circuit

    I check the propertie and off resistance is 100M/ on resistance is 0.01. But I dont think the bug come from the switch cause I got the same result if I replace the switch by a transistor. The problem came when it switch sate (on/off)

    - - - Updated - - -

    UPDATE: I try this circuit on an other computer and work fine. So what can cause this. 2 week before everything was ok and my old project still work fine but now I cant event light a led. This is not an pc spec issue cause I have an i7-7700k, 16g of ram and GTX1060.
    Last edited by bestrider14; 3rd September 2018 at 01:48.



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  4. #4
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    Re: Proteus: timestep too small on a basic circuit

    Find a circuit that works, delete all of the circuit so that you have a blank page, copy and paste the circuit you are having problems with into the blank page or redraw the circuit and see if it runs.



  5. #5
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    Re: Proteus: timestep too small on a basic circuit

    I format my pc and every thing go back to normal. Thank you anyway for you help



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