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Old 29th July 2014, 11:02 AM   #4411
poty is offline poty  Russian Federation
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Quote:
Originally Posted by Abszero View Post
Is there any advantages to go CLC over CRC?
CLC could have a lower impedance compared to crc. Or that low Z for the first part(raw part) is not very important because the SSHV will do the job?
As it is already mentioned - the low-Z output impedance is the job of the SSHV.
CLC may be needed for the power transformer to work properly. There are always some choices in the balance between current and voltage. Theoretically we could have the amplitude voltage of the secondary(~1.4*Vrms) at the output of a power supply, but then we expect that current must be very small. We can have the current at the output equal to the RMS current of the secondary minus the losses in the rectifiers and filtering, but the output voltage will be definitely lower than secondary RMS. In practice most power supplies are somewhere in between the extremes. Chokes (versus resistors) allows to save some energy which otherwise is lost in filters and use the power capability of a transformer more efficiently.
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Old 23rd August 2014, 09:54 PM   #4412
tame is offline tame  Israel
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Can I use IRFPC50 instead of irf840?
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Old 23rd August 2014, 11:34 PM   #4413
Salas is offline Salas  Greece
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It will probably work, most substitutions have worked, but why a heavier & costlier type with so much Ciss.
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Old 24th August 2014, 05:20 PM   #4414
tame is offline tame  Israel
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This is what I have, if this will work, why to buy more parts?
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Old 2nd September 2014, 08:37 AM   #4415
bekim is offline bekim  Albania
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I have received SSHV2 boards and I have couple concerns regarding assembly and capacitors, such:

1. Will it cause any problem if LED on board is connected on panel with leads approximate 10cm? (Oscillations, not recommended, etc.)

2. I believe that is matter of "taste" when comes to capacitors, and I can say that I went through this thread to see what other guys are using, but again your input is appreciated as you'll are experienced with this circuit.

What is your opinion on these caps?

- 10uF/400V Cornell Dubilier 935C4W10K (ebay ~$9, mouser ~$24)
- 0.33uF/400V WIMA MKP10 (ebay $4-$6)
- 10uf/400V MKP Solen (ebay ~$8)
- 0.33uF/400V MKP Solen (ebay ~$5)

- Jantzen Cross-Cap MKP 5% 400V - anyone used them on SSVH2?

3. Will MKP caps be "better" solution than MKT caps - C1 & C2?

Thanks
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Old 2nd September 2014, 12:47 PM   #4416
stajo is offline stajo  Sweden
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Originally Posted by bekim View Post
1. Will it cause any problem if LED on board is connected on panel with leads approximate 10cm? (Oscillations, not recommended, etc.)
Larger loops seldomly brings positive effects in circuit like this. I'd tap somewhere else if you want LEDs on front.
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Old 2nd September 2014, 01:21 PM   #4417
Salas is offline Salas  Greece
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The LED there is not to show power on. Its for TC compensation and its a part of the voltage reference circuit. Do not move it by adding cables.

Use MKP Solen (SCR) that many have used, so to be sure. MKP better than MKT, yes.
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Old 2nd September 2014, 01:52 PM   #4418
bekim is offline bekim  Albania
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Thanks Salas.
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Old 16th September 2014, 05:42 PM   #4419
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Hello

With 200vdc and 75ma out of sshv2,,,

normally 20v over, on input,,but what is the most volt over, on input...before the heat is to much ??

i have a heatsink 8cm wide -6cm high,,,,is this normally enough ,or shall it be much bigger ?

Best Bjarne
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Old 16th September 2014, 05:51 PM   #4420
AndrewT is online now AndrewT  Scotland
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What is your range of mains supply voltage?
What effect will that have on the input voltage to your regulator?
What will be the input voltage when mains is at lowest?
What will be the dissipation in the CCS when mains is at highest?

These are the standard checks for a LV regulator.
For an HV regulator they become even more important. For a shunt regulator at HV they are doubly important.
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