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Old 17th March 2006, 03:54 AM   #11
infinia is offline infinia  United States
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Still would like to see pass transistors on a single edge
advantages are many


1) wider variation of input voltages and transformer options
2) reduces cost of finding and purchasing 2 PCB heatsinks
3) Can use simple L bracket or even chassis mount
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Old 17th March 2006, 05:02 AM   #12
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Nice work Jens Have you made any calculations/simulations about the possible performance? Speed, noise, PSRR, regulation properties, output impedance?
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Old 17th March 2006, 05:38 AM   #13
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Hi Per,

I only did some P-SPICE sim...

Output impedance is about 0.250Ohm
Stability is ok and so is speed

1A step response @15V out is included

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Old 17th March 2006, 12:15 PM   #14
steenoe is offline steenoe  Denmark
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Quote:
Finally a 3D model of the board.
Nice job, I am in for a bunch of those.

Steen
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Old 17th March 2006, 12:38 PM   #15
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Old 17th March 2006, 03:40 PM   #16
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Quote:
Originally posted by kro5998
...what is the diameter of the Buffer caps?
The main filter caps (C4,5,23,24) are 17mm, the output caps (C10,18) are 10.5mm

Heat sinks are not needed for many applications. The WIKI will show parts kits and heat sinks separately.

I'm thinking the parts kit will include:

standard resistors (Xicon or Panasonic)
Panasonic FC electrolytics (values TBD)
polyester caps
MPSA42/92
MJE15031/32
1N4007
1N5239

Comments on parts selection?
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Old 17th March 2006, 10:13 PM   #17
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I added some a few extra parts to bring to the output impedance with a factor of 10 to about 25mOhm (@DC)

PSRR looks ok and stability is not an issue....

Work to come:
Update/evaluate voltage ref to TL431.
Look at snobbers... Carlos are you listening??
Change Terminals to something smarter
Build ratsnest to test circuit and different caps (I might make room for some SMT ceramics)

Updated the schmatics to latest version.

\Jens
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Old 17th March 2006, 10:25 PM   #18
SvErD is offline SvErD  Norway
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Would it be a good idea to rotate the component layout 90 deg on the board and put the output contacts in the same position as the power input on the filter boards?
Then it would be possible to piggyback the boards with short leads....
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Old 18th March 2006, 05:57 AM   #19
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Quote:
Originally posted by JensRasmussen
Update/evaluate voltage ref to TL431.
Look at snobbers... Carlos are you listening??
Why don't have LM431+LM385 pinout. If you have that you can use almost any reference in TO92 package. LM329 will fit without any hassle. Look at my JSR-06 PSU for inspiration.

If you have room why don't you add SOT23 transistors also. There are many good SOT23 devices out there.

It might also be an idea to have an extra LP-filter for the reference but this has also to do how much the noise is from the regulator itself.

C13, C15 why? Don't you loose feedback in high frequences?

Have you noticed that you have equally many parts as in a super regulator but it is still a discrete regulator.

Snobber what is that?
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Old 18th March 2006, 05:35 PM   #20
AndrewT is offline AndrewT  Scotland
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Hi,
can someone update the Wiki.
I have used the last blank line and reset the total to 125.

Is the price coming down below $6 yet?
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