Modelling PSU?!

Psychobiker · 22nd February 2008, 09:22 PM

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

Yvesm · 22nd February 2008, 09:46 PM

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.

Psychobiker · 22nd February 2008, 11:55 PM

Done!!

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

L

gootee · 23rd February 2008, 07:41 AM

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).

Psychobiker · 23rd February 2008, 10:13 AM

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?

Yvesm · 23rd February 2008, 10:41 AM

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.

Psychobiker · 23rd February 2008, 06:52 PM

SE. I have 50mV P-P

L

Tap for the 6V6s

And for the 12SN7

Psychobiker · 23rd February 2008, 07:27 PM

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

Psychobiker · 9th March 2008, 11:45 AM

with a little fiddling, 50mV became 2mV.

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

ErikdeBest · 9th March 2008, 12:23 PM

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

22nd February 2008, 09:22 PM	#1
Psychobiker diyAudio Member Join Date: Jul 2005 Location: Montréal QC	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

9th March 2008, 12:23 PM	#10
ErikdeBest diyAudio Member Join Date: Mar 2003 Location: Itoculo	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 __________________ my surname is indeed 'de Best': neither misspelling nor snobbism! Ask SY!

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22nd February 2008, 11:55 PM	#3
Psychobiker diyAudio Member Join Date: Jul 2005 Location: Montréal QC	Done!! Cheers for the help, trying to bring the ripple below .05v L

23rd February 2008, 07:41 AM	#4
gootee diyAudio Member Join Date: Nov 2006 Location: Indiana Blog Entries: 1	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).

23rd February 2008, 10:13 AM	#5
Psychobiker diyAudio Member Join Date: Jul 2005 Location: Montréal QC	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?

23rd February 2008, 06:52 PM	#7
Psychobiker diyAudio Member Join Date: Jul 2005 Location: Montréal QC	SE. I have 50mV P-P L Tap for the 6V6s And for the 12SN7

23rd February 2008, 07:27 PM	#8
Psychobiker diyAudio Member Join Date: Jul 2005 Location: Montréal QC	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

9th March 2008, 11:45 AM	#9
Psychobiker diyAudio Member Join Date: Jul 2005 Location: Montréal QC	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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