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Old 22nd February 2008, 08:22 PM   #1
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Default Modelling PSU?!

Hi,

Just wondering - is duncanamps' PSU designer odd?

I've tried to model with a 5V4 regulator, 7H choke and 15uF initial smoothing cap. Now, how do we proceed?

It won't let me put in a current tap with tank cap right after the inductor, even though thats how boozhound lists it to be, also will tell me that most things are an 'illegal combination!!'

Prolly an easy one, me having an off night!!

12SN7 driver and 6V6 outputs


L

Trying to model this

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Old 22nd February 2008, 08:46 PM   #2
Yvesm is offline Yvesm  France
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You cannot insert two similar elements (2 caps, 2 current taps, nor a R and a CT) in parallel.
Nor remove an element that provoque this situation.
For exemple, an LC filter between two loads (either R or CT) can't be removed unless you remove one of the loads before.
Sometimes, you cannot insert a CT after a cap, but only before it.
The same result, obviusly

Yves.
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Old 22nd February 2008, 10:55 PM   #3
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Done!!


Cheers for the help, trying to bring the ripple below .05v


L
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Old 23rd February 2008, 06:41 AM   #4
gootee is offline gootee  United States
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I like using LTspice. I have a few examples, here:

http://www.fullnet.com/~tomg/gooteesp.htm

Tube models are available, from other sources (including Duncan's site, I think).
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Old 23rd February 2008, 09:13 AM   #5
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I've managed to extract some sense, cheers for the help, it's just a matter of getting used to it! What's an acceptable ripple?
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Old 23rd February 2008, 09:41 AM   #6
Yvesm is offline Yvesm  France
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Quote:
Originally posted by Psychobiker

. . .
What's an acceptable ripple?
It depends on the amplifier design/topology

A push pull can be completly quiet with up to 20 V peak to peak on the plate supply.
An SE penthode may accept up to 5 V on the plate supply if the screen is "clean".
An SE triode may produce unnaceptable hum in hi efficiency speaker with just 1V p to p

What are you building ?

Yves.
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Old 23rd February 2008, 05:52 PM   #7
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SE. I have 50mV P-P



L

Tap for the 6V6s
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And for the 12SN7
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Old 23rd February 2008, 06:27 PM   #8
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I've got the ripple to even more acceptable levels on b+ since...

These are only preliminary, when I've got the rectifier and set up the circuit, I'll do more precise modelling

L
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Old 9th March 2008, 10:45 AM   #9
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with a little fiddling, 50mV became 2mV.

Those are acutlaly 90mA and 10mA draws...but sequentially kicking in after a 1sec


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Old 9th March 2008, 11:23 AM   #10
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Hi Psychobiker

Maybe you won't need it, but it is interesting literature anyway:
'lowering SE amplifier noise' (in cathode biased amplifiers) by Broskie

http://www.tubecad.com/april99/page2.html
http://www.tubecad.com/may99/page3.html
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