Troubleshooting and FAQ
This section deals with common questions.
No output
Q: I've run the simulation - there are no results?
A: You need to tick one of the boxes on the left hand side to tell PSUD which traces to show.
Glitches
Q: Why are there sometimes small glitches on the rectifier voltage?
A: These are caused by short cuts taken in the simulation. A dramatic speed improvement is made over alternative simulators such as SPICE, and this is the price that is paid for the extra speed.
Not enough voltage
Q: The output voltage at the end of the run does not seen to be as high as I measure in my amp - why?
A: Did you run the simulation for long enough? A big clue is if a voltage is still going up, there may be more to go.
Rectifiers (adding new ones)
Q: I want to use a type ABC123 rectifier - it's not in the list. Do I pick the nearest, or is there a better way?
A: You can certainly pick something you know to be close, alternatively you can add your own rectifier types if you don't mind working out the parameters.
Zero output voltage
Q: I've done the simulation, but the output hovers around zero - Why?
A: If you are using a constant current load, it is possible to try and draw more current out of the power supply than it can actually provide. PSUD2 gets round this by stopping the current draw when the load tries to pull the rail negative.
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