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Keantoken's CFP cap multiplier
Keantoken's CFP cap multiplier
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Old 15th March 2016, 09:20 PM   #921
Ryssen is offline Ryssen  Sweden
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I want 4.
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Old 15th March 2016, 10:38 PM   #922
TNT is online now TNT  Sweden
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I had to check mine using the dirtyPCB boards. I could not see such oscillations as your pictures. But I found something interesting... I hooked up my oscilloscope to my playing DAC and saw some traces of the music signal in the DC coming out of the KM. My power path looks as: 230 mains -> 2*Meanwell for +/-18V -> A half decent +/- stab from China 1A (LM317?) for +/- 12 -> The KM -> Soerkris DAC. The China stab board takes away almost all traces of SMPS switching blips. But noise is present ... 100mV p-p. After the KM the noise is a bit lower but the DC varies with music which it does not on the KM inlet.

I know that the KM is not a stab but was surprised it sagged this much.. Is it OK?

Short vid attached... .asc -> .mp4 to see it.

I hit Play 1 second in.

//
Attached Files
File Type: asc WP_20160315.asc (1.11 MB, 48 views)

Last edited by TNT; 15th March 2016 at 10:41 PM.
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Old 16th March 2016, 12:05 PM   #923
keantoken is offline keantoken  United States
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What's with these new oscilloscopes having cryptic labels so you can't figure out what the voltage is or the timebase setting?

Check the voltage across R1 on the KM, it should be about 35mV or so. A lot of SMPS noise could get lost in 100mV of noise... I'm not sure it's the KM in this case, I would check the LM317 has capacitors it's stable with and if that's not the problem, replace it.
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Old 16th March 2016, 06:35 PM   #924
Destroyer OS is offline Destroyer OS  United States
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Keantoken's CFP cap multiplier
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Originally Posted by TNT View Post
I had to check mine using the dirtyPCB boards. I could not see such oscillations as your pictures. But I found something interesting... I hooked up my oscilloscope to my playing DAC and saw some traces of the music signal in the DC coming out of the KM. My power path looks as: 230 mains -> 2*Meanwell for +/-18V -> A half decent +/- stab from China 1A (LM317?) for +/- 12 -> The KM -> Soerkris DAC. The China stab board takes away almost all traces of SMPS switching blips. But noise is present ... 100mV p-p. After the KM the noise is a bit lower but the DC varies with music which it does not on the KM inlet.

I know that the KM is not a stab but was surprised it sagged this much.. Is it OK?

Short vid attached... .asc -> .mp4 to see it.

I hit Play 1 second in.

//
Did you check for music without the KM in place?
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Old 16th March 2016, 08:05 PM   #925
keantoken is offline keantoken  United States
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Can you zoom in on the noise? What frequency is it?
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Old 17th March 2016, 06:32 AM   #926
TNT is online now TNT  Sweden
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I will make some more measurements... It seems that regulation is not so good - should it?

//
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Old 25th March 2016, 05:49 AM   #927
jameshillj is offline jameshillj  Australia
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I'm just catching up on the recent activities here and understand that you've sent off the pcb design (as per post 785) for a prototype version am a bit puzzled by the missing component/networks of D3, D1+R2, D2+R8, and D4 - are they not necessary anymore or simply tacked on below the board later?

If I follow the same numbering system on the explanation page, your pcb appears to have an extra capacitor on the input with a series R (top edge) to make up a C-R-C with the C3, onto R1, C1 and the base of Q1 (bc337), yes?

So, theoretically anyway, to complete the supply, you'd just need a simple pcb with the diodes and secondary winding snubbers, yes?

Would there be any advantage to move this 'series R' down between the first cap and the C3 side of the pcb, then move the R1 into the now vacant R position and simplify the tracks to the C1 and the base of Q1?

Also, would it any advantage to reduce the ground plane to a thick track that connects the ground terminals of the extra input filtering cap (plus the C3) to the main ground plane in order to provide some extra pcb impedance to input ripple - or am I talking nonsense (again!) ....
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Old 25th March 2016, 06:26 AM   #928
keantoken is offline keantoken  United States
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The protection diodes never seemed to work, since the majority of accidents seemed to be direct short discharge which will probably destroy the transistors anyway. Normal PSU operation doesn't seem to cause any problem for the KM so unless you want to use it as a bench supply in the trenches, the diodes aren't really necessary.

This board doesn't have a rectifier on it so yes, you will need one. Or power it from a regulated supply like some people do.

The amount of filtering you would gain by removing the ground plane will be insignificant compared to the output inductance of the KM and the inductance of the wires you power it with.

I think the traces are already as simple as they can be. The 1k/C2 filter feeds the LED which feeds the transistor base.
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Old 25th March 2016, 07:53 AM   #929
jameshillj is offline jameshillj  Australia
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Tks, got it.
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Old 25th March 2016, 07:58 AM   #930
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Forgot to add, Please include me in for 4 boards, when they are ready.
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