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Old 11th April 2012, 02:42 PM   #3611
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Hypex told me they do not adjust the shut down for the input an the fault must be there. I was promised I could send the PCB;s back for adjustment but I think we will leave them as they are.
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Old 11th April 2012, 03:42 PM   #3612
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You could run them at higher voltage as you are doing now, isn't it? This will give you a bit more power which you probably are missing now.
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Old 11th April 2012, 03:42 PM   #3613
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Quote:
Originally Posted by Erlend Sæterdal View Post
Hypex told me they do not adjust the shut down for the input an the fault must be there. I was promised I could send the PCB;s back for adjustment but I think we will leave them as they are.
Well, as the input stage only draws 40 mA, it would be really easy to use a couple of zener diodes to stabilize that voltage - allowing you to go back to full power on the main supply.
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Old 11th April 2012, 03:44 PM   #3614
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Originally Posted by Mark.Clappers View Post
Did you have a look with a microscoop? I use a stereo scoop with 10X magnification, with this I am able to see the tiny solder briges that are sometimes left behind when removing smd components, with the naked eye these are very hard to spot.
No, didn't use a microscope, but a 8x magnifying glass - pretty sure there are no solder bridges.
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Old 11th April 2012, 03:45 PM   #3615
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Originally Posted by Mark.Clappers View Post
I use a 2mm flat tip with a blob of solder. Works like a charm!
That's how I do it too.
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Old 11th April 2012, 04:34 PM   #3616
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Originally Posted by Mark Verhoeven View Post
You could run them at higher voltage as you are doing now, isn't it? This will give you a bit more power which you probably are missing now.
Yes a bit, no big difference tough ! 20 w or something near that.
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Old 11th April 2012, 04:36 PM   #3617
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Originally Posted by Julf View Post
No, didn't use a microscope, but a 8x magnifying glass - pretty sure there are no solder bridges.
Then the only thing I can think of is the "reflow" methode (with a hot air desoldering gun and some flux)..
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Old 11th April 2012, 04:37 PM   #3618
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Originally Posted by Julf View Post
Well, as the input stage only draws 40 mA, it would be really easy to use a couple of zener diodes to stabilize that voltage - allowing you to go back to full power on the main supply.
Zener diodes are noisy !
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Old 11th April 2012, 06:05 PM   #3619
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Originally Posted by Erlend Sæterdal View Post
Zener diodes are noisy !
Something a filter capacitor can't fix?
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Old 11th April 2012, 07:04 PM   #3620
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Originally Posted by Julf View Post
Something a filter capacitor can't fix?
I don't get what's happening (= I forgot ), is the danger that he would exceed the voltage limits for his input stage, so he has dropped his rail voltage to provide it directly? Zeners with a cap bypass would surely work, but I understand Erlend wanting to find the cleanest possible source. He could use a IC regulator or precision voltage source...if there were room for that...But if the voltage simply feeds regulators like the HxRs, which have an incredibly high PSRR, your zener/cap suggestion would be as clean as anybody could want.

Also wondering about your resistor woes...obviously you measured for shorts and opens both within and near the resistor afterwards. I've had stray fibers of copper do a job on a circuit, then disappear with a good shake or compressed air. Do you think a semiconductor was blown from the incident? When I see a total collapse with no visible damage, that's what I suspect next.
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