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Old 20th March 2011, 01:35 PM   #1
markusA is offline markusA  Sweden
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Default Tubes and LTspice?

I'm encountering some problems when I try to sim some basic psu's and tube circuits.

I have most of the beginner stuff figured out but there are a few things I just can't wrap my head around.
When I try to run an AC analysis with the PSU hooked up to the tube buffer it just goes bizarre.
If I were to hazard a guess, LTspice takes some form of snapshot at start up and uses those values as reference? A simulated psu takes a little time to get the caps charged and everything working properly.
Exchanging the psu for batteries everything looks pretty much ok.

What's the use if I can't run the sim with the psu hooked up to the circuit?
I'm just not getting this?
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Old 20th March 2011, 03:07 PM   #2
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Quote:
Originally Posted by markusA View Post
I'm encountering some problems when I try to sim some basic psu's and tube circuits.

I have most of the beginner stuff figured out but there are a few things I just can't wrap my head around.
When I try to run an AC analysis with the PSU hooked up to the tube buffer it just goes bizarre.
This is because the AC analysis does not produce the dc ouput from from PSU (only a transient analysis can do that) so your tube buffer has no HT hence the bizarre results.

Cheers

Ian
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Old 20th March 2011, 03:57 PM   #3
markusA is offline markusA  Sweden
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Yeah, I've started playing around with various configs with dc sources. You know, just to see what I can come up with...
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Old 20th March 2011, 04:48 PM   #4
euro21 is offline euro21  Hungary
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Default LTSpice PSU sim

At the Transient Simulation Command set "Time to Start Saving Data:" (200-1000ms).
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Old 20th March 2011, 05:19 PM   #5
markusA is offline markusA  Sweden
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ruffrecords had it right.
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