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Keantoken's CFP cap multiplier
Keantoken's CFP cap multiplier
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Old 25th March 2015, 09:33 AM   #781
TNT is offline TNT  Sweden
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Quote:
Originally Posted by sikahr View Post
5x5 cm, at DirtyPCBs 14$ for 10 pieces, free shipping

Kean or someone else, please take a look is something wrong, thanks.

PS all high height element on top of the board, all low height element on bottom of the board
Finally - thank you

I would like at least 4 boards so I put myself in the queue :-)


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Old 25th March 2015, 12:25 PM   #782
TNT is offline TNT  Sweden
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# Accommodation for a capacitor on the + and - outputs (out<->ground)?
# The components on the low side will have its legs sticking up on the "high" side - I see some legs close to the rim of the bigger capacitors - is there a risk for a short here? Even if you don't physically ground the capacitor to keep clearance, it could tilt down to touch the "can" maybe?

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Old 25th March 2015, 12:42 PM   #783
TNT is offline TNT  Sweden
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Aha - I will be ordering these from DirtyPCBs, right?

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Old 25th March 2015, 01:04 PM   #784
sikahr is offline sikahr  Croatia
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Quote:
Originally Posted by TNT View Post
Aha - I will be ordering these from DirtyPCBs, right?

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Yup
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Old 25th March 2015, 01:09 PM   #785
keantoken is offline keantoken  United States
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The pins under the caps do worry me. The input cap grounds should have their own trace going straight to the input ground to reduce ground noise. There should also be caps on the output.

Here's what I've done so far on my layout. This is for under 50V. I removed most of the protection diodes because they only help if you do something wrong, and even then they don't seem to do much good. I would say this is a very muntzed version. It can be used for both positive and negative.

So, tell me what you don't like and I'll try and get it ready soon.
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File Type: png PKM-compact.png (33.7 KB, 401 views)
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Old 25th March 2015, 01:16 PM   #786
sikahr is offline sikahr  Croatia
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Quote:
Originally Posted by TNT View Post
# Accommodation for a capacitor on the + and - outputs (out<->ground)?
//
Not enough space, sorry , If you can figure out where to place it, shoot.

Quote:
Originally Posted by TNT View Post
# The components on the low side will have its legs sticking up on the "high" side - I see some legs close to the rim of the bigger capacitors - is there a risk for a short here? Even if you don't physically ground the capacitor to keep clearance, it could tilt down to touch the "can" maybe?

//
Yes, legs beneath bigger caps are close, but same answer, wery tight space.
You can bend legs sticking up outward before soldering and put some insulation tape on top of them, it will be OK this way.
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Old 25th March 2015, 01:20 PM   #787
keantoken is offline keantoken  United States
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Sorry for not responding sooner - DIYAudio never mailed me to notify me of this post.

Quote:
Originally Posted by jacobsmith View Post
Hi all,
Thanks to MR Keantoken for the circuit design
need to ask here, what is the Difference Result/Performance between those A and B circuit regarding KM regulator ?
The one with the extra diodes works above 50V and withstands high inrush currents, although that is an unlikely problem.

Quote:
Any options to make it for let say :
1. Low voltage 12 volt, low current 20 -50mA only
2. High voltage 20-25 Volt, high current 3 - 10 Amp.
So we can choose the right Transistor and components value and avoiding any oscillations.
3. is it good to use Two positive circuit for Dual Rail supply + & - ?
4. Any disadvantage using positive circuit into Dual rail supply ?
Sorry too many Q
Thanks for any clue.
regards,
jc
1: For 20mA-10mA try 150R for R1.
2: Use OnSemi D45H11/D44H11 with a heatsink instead of C5171/A1930, but a 2.2V green LED instead of 3 diodes in the upper schematic. Have a lytic at the output and be careful about using film bypass (if it oscillates the output voltage will probably rise).
3: Not if your ground current is negative or below 15mA.
4: This would be like having a +15 V and +30V output from your supply, except you use the +15V as ground and ground as -15V. To keep ground from having too little or negative current, the -15V rail would always need to draw at leat 10mA more than the +15V rail.
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Old 25th March 2015, 07:04 PM   #788
TNT is offline TNT  Sweden
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Would it be possible to make a version without heatsinks so that no shorting of caps is possible and to house small output caps? Please

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Old 25th March 2015, 07:11 PM   #789
Destroyer OS is offline Destroyer OS  United States
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Keantoken's CFP cap multiplier
Quote:
Originally Posted by TNT View Post
Would it be possible to make a version without heatsinks so that no shorting of caps is possible and to house small output caps? Please

//
What about surface mount? You can have a layer of copper act as a heatsink. It'll limit the current, but probably not anywhere near many applications.
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Old 26th March 2015, 08:36 AM   #790
sikahr is offline sikahr  Croatia
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<< V2 >>

* only one mounting hole, I hope enough for 5x5 cm, saving space here
* added output caps (C5, C6)
* big caps on the edge of the board, larger footprint possible
* dedicated ground traces for C1-C4 (noise minimization)
* all traces 66 mils (1,67 mm) width
* no pins beneath caps except output caps, but not close

only problem for me is welding C5&C6, pins very close to diodes, but I hope is doable

Please check&comment

PS

You have choice to mount low height component to top or bottom, I put it on bottom but nothing stops you to mount on top.
That way, C5 & C6 will sit on diodes but welding is not a problem.
Eventualy I can make version with low height component to top (no change in cooper traces only silkscreen change).
Attached Images
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File Type: jpg 2.jpg (625.0 KB, 331 views)
File Type: jpg 3.jpg (452.9 KB, 310 views)
File Type: jpg 4.jpg (528.1 KB, 298 views)
File Type: jpg 5.jpg (233.3 KB, 129 views)
File Type: jpg 6.jpg (159.7 KB, 145 views)
File Type: jpg 7.jpg (116.4 KB, 100 views)

Last edited by sikahr; 26th March 2015 at 08:51 AM.
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