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Old 10th April 2012, 05:21 PM   #2891
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Great balls of fire

R2 disappeared & R5 burned, possibly D5 & D6 damaged
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Last edited by merlin el mago; 10th April 2012 at 05:33 PM.
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Old 10th April 2012, 05:30 PM   #2892
AndrewT is offline AndrewT  Scotland
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Have you worked out yet how the Salas Shunt Regulator low voltage versions work?

Prior to gaining that knowledge I consider it stupidity to gamble with 240Vdc in a circuit you don't understand.
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Old 10th April 2012, 05:38 PM   #2893
iko is online now iko  Canada
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Don't be so harsh Andrew; the moment you make PCBs available you will have to expect that people have some expectation of solder, plug, and play.

However, Andrew is right in that you need to be very careful with these high voltages. Someone should post a little guide of how to first test these regulators once soldering is finished. Dummy resistor, current calculations, etc. This may have very well been done, but I don't know it because I haven't been reading so carefully the thread lately.
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Old 10th April 2012, 05:40 PM   #2894
vgeorge is offline vgeorge  Greece
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At least the board is black and doesn' t show bad!
If I was you now, I would take out ALL the semis and check them. For sure one of the dn2540 is off.
I think you have shorted something.
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Old 10th April 2012, 05:41 PM   #2895
vgeorge is offline vgeorge  Greece
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Iko,
Salas have already made a PDF for that.
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Old 10th April 2012, 06:01 PM   #2896
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@ Iko as you said I expected plug & play but possible is my fault: irf840 not isolated well from heatsink, I do the SSHV p2p and going OK 240V 60mA. Salas posted a PDF for this new version SSHV2, I followed his instructions to make it.

@George, OK I will change all semis for a new set to go fast.
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Old 10th April 2012, 06:20 PM   #2897
vgeorge is offline vgeorge  Greece
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If you use the same pcb, check and clean it.
Don' t go fast, take your time.
When I first did it p2p it worked fine, because I took my time. I burned one or two semis when I was trying different ones and I thought that I gained confidence.
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Old 11th April 2012, 09:44 AM   #2898
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Changed all semis, diodes & burned resistors.

Max. current reached 319mA I read 0,319V across TP, Vout with this current 281V but can low the voltage to 240V the voltage is fixed 281V

If I reduce the Vout with R4 trimmer (used for adjust current) I can reach 240V but the current must reduced to 275mA I read 0,275V across TP
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Old 11th April 2012, 09:45 AM   #2899
AndrewT is offline AndrewT  Scotland
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The regulator half is not regulating.
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Old 11th April 2012, 11:33 AM   #2900
vgeorge is offline vgeorge  Greece
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Did you measure the parts that you replaced?
What was burned?
Also, what Andrew said, current regulator seems to be working, voltage regulator not.
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