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Old 27th January 2012, 04:23 AM   #1811
cOz is offline cOz  United States
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Quote:
Originally Posted by earflappin View Post
Has any party finalized a chassis design available for immediate purchase?
Mine are being machined this week. I should have them very soon. I don't have mocked up computer models but I should have real pics before too long.
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Old 27th January 2012, 06:05 AM   #1812
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I'm here lads. Busily routing circuit boards which I do with the kind of abandon normally only seen in 2-year olds. Hence the silence.

I didn't really follow but I hear that there's been some discussion about amps not surviving hot plugging (or what is effectively hot plugging with charge still on the supply). Actually I plugged amps into a charged supplies several times and nothing happened BUT I can indeed conceive of problems if the pins got connected in exactly the wrong order. Considering that I've tried to make the amps immune against just about every other calamity I think I'll try and work out how to get past this one as well. With a bit of luck it can be retrofitted on the current batch.
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Old 27th January 2012, 09:11 AM   #1813
ChrisPa is offline ChrisPa  United Kingdom
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Quote:
Originally Posted by Bruno Putzeys View Post
I didn't really follow but I hear that there's been some discussion about amps not surviving hot plugging (or what is effectively hot plugging with charge still on the supply).
Quote:
Originally Posted by zhai View Post
I'm not going to completely exclude the possibility that I've made some sort of mistake in the assembly of the amp, I just can't figure out what that would be. I tried to just follow the recommended way, and the only modification was to insert a small circuit to control a mains relay and a push button, otherwise everything should be as Hypex suggests.
Don't know if they're related. Of course psu control should be using the control connector on the smps or by switching the mains (which is the implication of the above post) - so J1 or J3 - not making any changes to the umbilical between amp and smps
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Old 27th January 2012, 01:00 PM   #1814
back is offline back  Greece
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Quote:
Originally Posted by zhai View Post
zap4ever: I don't know if I'm the right person to say how you should do it instead, but I imagine that if I had just connected everything and powered all the modules up at the same time, it would have been fine.

back: after 3 hours there was still enough charge left to make sparks and noise.

There are a lot of pins on the smps, how exactly should one go about using a resistor to dissipate the charge?
it shouldn`t cause problems to the ampa other than scare you.

what i do is to connect a resistor to each rail for a few minutes.

you can check the voltage drop with a DMM.

when it go down to 3-4volt you will have no more sparks.

the rest of the pins don`t need discharge.
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Old 27th January 2012, 01:31 PM   #1815
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Quote:
Originally Posted by back View Post
it shouldn`t cause problems to the ampa other than scare you.

what i do is to connect a resistor to each rail for a few minutes.

you can check the voltage drop with a DMM.

when it go down to 3-4volt you will have no more sparks.

the rest of the pins don`t need discharge.
Will it be possible for you to be more specific about exactly where you connect the resistor to discharge the PSU. Seems like this information could very soon become handy (vital I would say).
Regards Ole
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Old 28th January 2012, 01:31 PM   #1816
back is offline back  Greece
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Quote:
Originally Posted by ZAP4EVER View Post
Will it be possible for you to be more specific about exactly where you connect the resistor to discharge the PSU. Seems like this information could very soon become handy (vital I would say).
Regards Ole
connector j2.
pin1-pin3
pin4-pin7.
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Old 29th January 2012, 10:55 AM   #1817
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Default SMPS questions

Quote:
Originally Posted by Juhleren View Post
Dear friends,

From the comments on the smps supply opposed to a classic linear one, it does sound like there is a consensus that the "new" technology has surpassed the old one also on sound quality. Please correct me here, as I am trying to get a hold on the possibilities that comes with smpsīs over linear PS designs...

I have a few Qīs regarding how to read the specs and chose a proper smps for various applications that I hope someone would be helpful to answer:

As I get it the smps tech generally regulates in a different way to that of the linear PSīs as the recharging circles are not restricted to the main frequency but designed to be fx 100kHz. This should mean that smps should be "stiffer" than linear supplies, no?

This should also mean that the distortion artifacts produced by the charging is moved up in frequency according to reduced charging circles, no? Hence probably also related to subjectively different audible signature, no?

Generally, what counts in smps design to achieve the very best audible performance of the active circuitry hooked on it?

How big audible differences should one expect from one smps design to another? Has anyone tried various smps designs on the same circuitry to assess this?

Does power rating still count, or does it just need to be adequate. In the linear days a 1000VA donut would blow a way a 200 VA one although only a few watts was actually used... Does this translate into the smpsīs too, hence more authority can be gained by getting a more "stiff" supply by fx choosing a 1200watt over a 400 watt one?

Also when making linear PSīs there is little doubt regarding getting greater performance from dedicated rails per channel opposed to share one big pair of +/- VDC. Does this also count for smpsīs, and if so which of the hypex offerings does offer plural dedicated pairīs VDC rails? Or do one need to purchase a dedicated smps for each channel to get the very best performance?

I would be greatful for any comments.

cheers,
Dear all,
I am still puzzled about SMPS technology, but unfortunately I got no replies on my above questions. I have probably asked the wrong questions, which accounts for my lack of insight on the subject. If so, then please help me to ask "the right questions". In case, and I really doubt so, that no body actually knows anything about SMPS tech and sound, than that would also be a useful answer...

kind regards,
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Old 29th January 2012, 11:19 AM   #1818
Julf is offline Julf  Europe
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Well, a SMPS should provide more precise regulation, so in that sense, it is "stiffer" than a linear supply. And while a larger transformer provides a lower impedance in a linear power supply, I don't see any benefit in a SMPS that is more powerful than what is needed.
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Old 30th January 2012, 06:59 AM   #1819
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The SMPSU will first rectify the mains to provide a high dc voltage. For higher-power SMPSUs, this high voltage then powers a half or full-bridge transformer-isolated PWM output stage, with regulation of the PWM performed by a feedback loop from the dc output (often through an opto-coupler for isolation) into the control chip. Provided that the current-limit of the supply is not exceeded, there will be no advantage in using a PSU of a higher power than is neccessary.
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Old 30th January 2012, 07:14 AM   #1820
NicMac is offline NicMac  Italy
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Quote:
Originally Posted by Juhleren View Post
Dear all,
I am still puzzled about SMPS technology, but unfortunately I got no replies on my above questions. I have probably asked the wrong questions, which accounts for my lack of insight on the subject. If so, then please help me to ask "the right questions". In case, and I really doubt so, that no body actually knows anything about SMPS tech and sound, than that would also be a useful answer...
kind regards,
You should post your questions in the "Power Supplies" forum and keep this thread clean. There is a ton of information around about SMPS technology here and elsewhere.
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