Electronics > Projects, Designs, and Technical Stuff
circuit simulation
yalect:
Hi,
I would like to ask you that I have problem with some circuits like this (attached picture) sometimes when I simulated it with Proteus 8 it shows me the message ([SPICE] TRAN : timestep too small; timestep =0.00133113: trouble with instance Q1 and simulation stoped]).
how to resolve or set that problem? timestep too small
thank you
JoeyG:
I'm not familiar with this simulator, but where is the Voltage (power source)?
Ian.M:
Its more likely to be an issue with the switch in series with C2. When it initially closes it will cause a step change in Q2 Vbe, which may be problematic if the Q2 BC547 model is a macromodel.
SiliconWizard:
I don't know much about Proteus, I'm assuming it's a Spice-based simulator. In particular, I don't know about the base parameters for base parts.
I would try adding some small ESR to C2 (if there is an ESR parameter for capacitors), or manually add a small resistor in series (like 1-2 ohm) with C2, and see how that goes.
Wimberleytech:
I suggest that you reduce the cap to 1uf or less and run the simulation.
Is your switch starting in the on or off position?
What is the on resistance and off resistance of the switch?
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