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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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USB power supply.
Have a few devices in the AV setup which are USB 5v powered. To try and
keep things as neat as possible, all the mains to that are now IEC, as that takes up less space than 13 amp. So decided a USB power supply would be nice. One where the PS was internal rather than a wall wart, and a main cable I could fit an IEC plug to. Found one on Ebay with 8 outlets - not cheap either. One of the things it would power being the a Toslink to phono adaptor - TV audio into the amp. Which was just fine on its supplied 13 amp wall wart. With a USB to USB lead. I now get a noise like a distant burglar alarm on its output with the new PS. ;-) Changed back to the original PS, OK. Not a ground loop either. Happens with only it plugged in. -- *El nino made me do it Dave Plowman London SW To e-mail, change noise into sound. |
#2
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USB power supply.
On 30/09/2019 15:05, Dave Plowman (News) wrote:
Have a few devices in the AV setup which are USB 5v powered. To try and keep things as neat as possible, all the mains to that are now IEC, as that takes up less space than 13 amp. So decided a USB power supply would be nice. One where the PS was internal rather than a wall wart, and a main cable I could fit an IEC plug to. Found one on Ebay with 8 outlets - not cheap either. One of the things it would power being the a Toslink to phono adaptor - TV audio into the amp. Which was just fine on its supplied 13 amp wall wart. With a USB to USB lead. I now get a noise like a distant burglar alarm on its output with the new PS. ;-) Changed back to the original PS, OK. Not a ground loop either. Happens with only it plugged in. Poor regulation or filtering, and that before any of the same is done in the device. Maybe there is a ferrite choke you have omitted in your rewiring? Do you have a scope so you can look at the power rails? Or just send it back (which will stop Brian screaming as it is probably also doing something to his radio as well). -- Adrian C |
#3
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USB power supply.
On 30/09/2019 15:05, Dave Plowman (News) wrote:
Have a few devices in the AV setup which are USB 5v powered. To try and keep things as neat as possible, all the mains to that are now IEC, as that takes up less space than 13 amp. So decided a USB power supply would be nice. One where the PS was internal rather than a wall wart, and a main cable I could fit an IEC plug to. Found one on Ebay with 8 outlets - not cheap either. 8 outlets is quite a lot. I have 5 and 6 port ones which are convenient for going on holiday and have figure of 8 mains input sockets which I use with an appropriate cable. |
#4
Posted to uk.d-i-y
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USB power supply.
On 30/09/2019 15:05, Dave Plowman (News) wrote:
Have a few devices in the AV setup which are USB 5v powered. To try and keep things as neat as possible, all the mains to that are now IEC, as that takes up less space than 13 amp. So decided a USB power supply would be nice. One where the PS was internal rather than a wall wart, and a main cable I could fit an IEC plug to. Found one on Ebay with 8 outlets - not cheap either. One of the things it would power being the a Toslink to phono adaptor - TV audio into the amp. Which was just fine on its supplied 13 amp wall wart. With a USB to USB lead. I now get a noise like a distant burglar alarm on its output with the new PS. ;-) Changed back to the original PS, OK. Not a ground loop either. Happens with only it plugged in. Are all the outlets the same power rating? If not try one output that can supply a higher current or, if possible, try your Toslink adapter on its own in the 10 output power supply. Does the total load of your USB devices exceed the total power available from your USB power supply brick? For instance in may be rated for a total of 50W which equates to 10 USB outputs at 1Amp. If you were using all 10 outputs and a couple required, say, 2 Amps, then the other outlets may only be able to supply 0.75 Amps or maybe when reaching overload the regulation of the power starts failing -- mailto : news {at} admac {dot} myzen {dot} co {dot} uk |
#5
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USB power supply.
Dave Plowman (News) wrote:
Have a few devices in the AV setup which are USB 5v powered. To try and keep things as neat as possible, all the mains to that are now IEC, as that takes up less space than 13 amp. So decided a USB power supply would be nice. One where the PS was internal rather than a wall wart, and a main cable I could fit an IEC plug to. Found one on Ebay with 8 outlets - not cheap either. One of the things it would power being the a Toslink to phono adaptor - TV audio into the amp. Which was just fine on its supplied 13 amp wall wart. With a USB to USB lead. I now get a noise like a distant burglar alarm on its output with the new PS. ;-) Changed back to the original PS, OK. Not a ground loop either. Happens with only it plugged in. Depending on the loads, you could be simply over loading it and it cant regulate properly. Unless by your Happens with only it plugged in comment you mean you still hear it with, say, just your amplifier and speakers and no USB devices. That suggests a the beast has an inherent noise problem. Price doesnt always equate to quality in terms of noise performance BTW- plasma TVs were very expensive but very electrically noisy. What make is it? I find Anker ones are generally pretty good. I dont know if they do an 8 way one but certainly a 4 way. |
#7
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USB power supply.
No that will not happen. In many cases its tings like the behringer audio pc
interface that seem most prone. Short of getting inside and adding decoupling, if that were possible, I ended up with a powered usb hum, and found one particular socket was best. Of course then I wired in the TV and found the video cable from the pc made it have what sounded like a 100hz buzz all the time. sulk. Brian -- ----- -- This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please Note this Signature is meaningless.! "Adrian Caspersz" wrote in message ... On 30/09/2019 15:05, Dave Plowman (News) wrote: Have a few devices in the AV setup which are USB 5v powered. To try and keep things as neat as possible, all the mains to that are now IEC, as that takes up less space than 13 amp. So decided a USB power supply would be nice. One where the PS was internal rather than a wall wart, and a main cable I could fit an IEC plug to. Found one on Ebay with 8 outlets - not cheap either. One of the things it would power being the a Toslink to phono adaptor - TV audio into the amp. Which was just fine on its supplied 13 amp wall wart. With a USB to USB lead. I now get a noise like a distant burglar alarm on its output with the new PS. ;-) Changed back to the original PS, OK. Not a ground loop either. Happens with only it plugged in. Poor regulation or filtering, and that before any of the same is done in the device. Maybe there is a ferrite choke you have omitted in your rewiring? Do you have a scope so you can look at the power rails? Or just send it back (which will stop Brian screaming as it is probably also doing something to his radio as well). -- Adrian C |
#8
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USB power supply.
In article ,
alan_m wrote: On 30/09/2019 15:05, Dave Plowman (News) wrote: Have a few devices in the AV setup which are USB 5v powered. To try and keep things as neat as possible, all the mains to that are now IEC, as that takes up less space than 13 amp. So decided a USB power supply would be nice. One where the PS was internal rather than a wall wart, and a main cable I could fit an IEC plug to. Found one on Ebay with 8 outlets - not cheap either. One of the things it would power being the a Toslink to phono adaptor - TV audio into the amp. Which was just fine on its supplied 13 amp wall wart. With a USB to USB lead. I now get a noise like a distant burglar alarm on its output with the new PS. ;-) Changed back to the original PS, OK. Not a ground loop either. Happens with only it plugged in. Are all the outlets the same power rating? If not try one output that can supply a higher current or, if possible, try your Toslink adapter on its own in the 10 output power supply. The device is quite a posh one, and shows on its screen how much current each outlet is taking. But I did say I'd tried it with only the Toslink unit plugged into it with the same result. Does the total load of your USB devices exceed the total power available from your USB power supply brick? For instance in may be rated for a total of 50W which equates to 10 USB outputs at 1Amp. If you were using all 10 outputs and a couple required, say, 2 Amps, then the other outlets may only be able to supply 0.75 Amps or maybe when reaching overload the regulation of the power starts failing -- *If I agreed with you, we'd both be wrong. Dave Plowman London SW To e-mail, change noise into sound. |
#9
Posted to uk.d-i-y
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USB power supply.
In article ,
Brian Reay wrote: Not a ground loop either. Happens with only it plugged in. Depending on the loads, you could be simply over loading it and it cant regulate properly. It would be some poor device with a large number of outlets which couldn't supply the maximum USB can handle to only one of them Unless by your Happens with only it plugged in comment you mean you still hear it with, say, just your amplifier and speakers and no USB devices. That suggests a the beast has an inherent noise problem. Price doesnt always equate to quality in terms of noise performance BTW- plasma TVs were very expensive but very electrically noisy. Not quite sure what you mean. The noise comes from the combination of the Toslink adaptor and that power supply. Even with the optical cable unplugged. Change the PS and the noise goes. What make is it? I find Anker ones are generally pretty good. I dont know if they do an 8 way one but certainly a 4 way. I'll look later. -- *What do you call a dinosaur with an extensive vocabulary? A thesaurus.* Dave Plowman London SW To e-mail, change noise into sound. |
#10
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USB power supply.
On 01/10/2019 10:57, Dave Plowman (News) wrote:
The device is quite a posh one, and shows on its screen how much current each outlet is taking. But I did say I'd tried it with only the Toslink unit plugged into it with the same result. I'd hazard a guess here, that this device was intended to "charge" things rather than provide "clean" DC for audio stuff... |
#11
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USB power supply.
In article ,
Lee wrote: On 01/10/2019 10:57, Dave Plowman (News) wrote: The device is quite a posh one, and shows on its screen how much current each outlet is taking. But I did say I'd tried it with only the Toslink unit plugged into it with the same result. I'd hazard a guess here, that this device was intended to "charge" things rather than provide "clean" DC for audio stuff... Did wonder. Although the description didn't say that. -- *I don't have a license to kill, but I do have a learner's permit. Dave Plowman London SW To e-mail, change noise into sound. |
#12
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OT: A MESSAGE FROM NIGEL FARAGE
In article ,
Andy Burns wrote: there is no such thing as society Irrelevant fatuous comment made by Mrs T Selectively quoted, of course ... Do wish there was a bit more of that on here. -- He who laughs last, thinks slowest* Dave Plowman London SW To e-mail, change noise into sound. |
#13
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OT: A MESSAGE FROM NIGEL FARAGE
On Tue, 01 Oct 2019 13:58:52 +0100, Dave Plowman (News) wrote:
Do wish there was a bit more of that on here. In that case allow me to assist, Dave. This is from the item Andy linked to... Prime Minister Mrs. Thatcher: "What is wrong with the deterioration? [mistranscription?] I think we have gone through a period when too many children and people have been given to understand I have a problem, it is the Government's job to cope with it! or I have a problem, I will go and get a grant to cope with it! I am homeless, the Government must house me! and so they are casting their problems on society and who is society? There is no such thing! There are individual men and women and [end p29] there are families and no government can do anything except through people and people look to themselves first. It is our duty to look after ourselves and then also to help look after our neighbour and life is a reciprocal business and people have got the entitlements too much in mind without the obligations, because there is no such thing as an entitlement unless someone has first met an obligation and it is, I think, one of the tragedies in which many of the benefits we give, which were meant to reassure people that if they were sick or ill there was a safety net and there was help, that many of the benefits which were meant to help people who were unfortunateIt is all right. We joined together and we have these insurance schemes to look after it. That was the objective, but somehow there are some people who have been manipulating the system and so some of those help and benefits that were meant to say to people: All right, if you cannot get a job, you shall have a basic standard of living! but when people come and say: But what is the point of working? I can get as much on the dole! You say: Look! It is not from the dole. It is your neighbour who is supplying it and if you can earn your own living then really you have a duty to do it and you will feel very much better! There is also something else I should say to them: If that does not give you a basic standard, you know, there are ways in which we top up the standard. You can get your housing benefit. But it went too far. If children have a problem, it is society that is at fault. There is no such thing as society. [end p30] There is living tapestry of men and women and people and the beauty of that tapestry and the quality of our lives will depend upon how much each of us is prepared to take responsibility for ourselves and each of us prepared to turn round and help by our own efforts those who are unfortunate. And the worst things we have in life, in my view, are where children who are a great privilege and a trustthey are the fundamental great trust, but they do not ask to come into the world, we bring them into the world, they are a miracle, there is nothing like the miracle of lifewe have these little innocents and the worst crime in life is when those children, who would naturally have the right to look to their parents for help, for comfort, not only just for the food and shelter but for the time, for the understanding, turn round and not only is that help not forthcoming, but they get either neglect or worse than that, cruelty." -- Leave first - THEN negotiate! |
#14
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USB power supply.
On Mon, 30 Sep 2019 15:05:11 +0100, Dave Plowman (News) wrote:
I now get a noise like a distant burglar alarm on its output with the new PS. ;-) Poor filtering on the output(s) of the new SMPSU and/or poor power rail noise immunity of the adapter. Running te USB power cable through a ferrite coore might be enough. Failing that an inline LC filter, two ferrite cored tordial coils in each leg with a 0.1 uF capacitor across the in and out. Coils need to made from fairly hefty copper wire to avoid significan't volt drop. It does take much R at 1 A to drop the complete tolerance range of USB (5.25 V to 4.75 V). Changed back to the original PS, OK. Pragmatic solution: use that PSU. -- Cheers Dave. |
#15
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OT: A MESSAGE FROM NIGEL FARAGE
In article ,
Cursitor Doom wrote: Do wish there was a bit more of that on here. In that case allow me to assist, Dave. and so they are casting their problems on society and who is society? There is no such thing! There - I've done it for you. Selective quoting. -- *Jokes about German sausage are the wurst.* Dave Plowman London SW To e-mail, change noise into sound. |
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