thoughts on this power supply for pier (added) would this oscilloscope help me

[iwols]

2 hours ago, RayD said:

Sounds like a great plan.  You would need some DC-DC convertors (buck convertors) for the 5V but that's a simple enough mod.  Yo

hi ray my plan was a 12v supply and a 5 volt supply which my original post has available in both,might just have to utilise my 12 volt power supply and the small 5v mains supply i have,like i say i was looking at two seperate dedicated  internal supplies at the beginning,just wish i knew how good the original supplies are,how could i tell?

[Dr_Ju_ju]

The original you linked to, is what I use for powering my 3D printers; and for that they are ideal, but for more 'sensitive' equipment, I use either this switched mode supply https://www.maplin.co.uk/p/power-pax-120w-switched-mode-dc-fixed-voltage-12v-power-supply-n96ju  or something this linear supply https://www.maplin.co.uk/p/qj1830sb-30-amp-linear-power-supply-r52fp.

  I then use 'buck' down converters for 5V, 8.4V (Cannon Cameras), etc... 

 

[iwols]

interesting seems the same to me or very similar??

https://www.maplin.co.uk/p/power-pax-150w-switch-mode-acdc-multi-voltage-power-supply-n52kh

[Merlin66]

iwols,

That unit works from 220Vac and can be set to different output DC voltages.... the previous unit (I have a couple of these, one to power the NEQ6 mount at 15v and another to power the USB Hub at 6V) is a DC to DC ie works on the 12V DC in - variable out.

 

[iwols]

thanks merlin which one powers your heq5 please the maplin one or the ebay one cheers

[Merlin66]

Clarification:

I have a generic 10A 240V to 12V dc power supply (eBay) - the outlet modified to a 12V socket. (Similar to https://www.maplin.co.uk/p/power-pax-120w-switched-mode-dc-fixed-voltage-12v-power-supply-n96ju?ranMID=40341&ranEAID=je6NUbpObpQ&utm_source=VigLink&utm_campaign=always_on&utm_medium=cpc&utm_term=affiliate&cmpid=affiliates:always_on:affiliate:je6NUbpObpQ&ranSiteID=je6NUbpObpQ-2vAYTISIhblmzjZ925T5pg)

Then a 12V convertor:

https://www.maplin.co.uk/p/12v-3a-universal-dc-power-supply-with-6-power-tips-a92jh

I use the Maplin one set to 15V.

Been using it for more than seven years..... no issues, no drama.

 

[iwols]

thanks merlin do these look the same to you??

http://www.ebay.co.uk/itm/Universal-DC-12V-24V-LED-Light-3D-Printer-CCTV-Regulated-Switching-Power-Supply/253040078407?hash=item3aea5d2e47:m:mkbDJWcVCzQA3igP_0LeuaQ

[iwols]

sorry merlin which maplin one

[Merlin66]

Your question crossed with my edit.....

[iwols]

im just trying to get to the bottom of are these good enough merlin cheers

http://www.ebay.co.uk/itm/Universal-DC-12V-24V-LED-Light-3D-Printer-CCTV-Regulated-Switching-Power-Supply/253040078407?hash=item3aea5d2e47:m:mkbDJWcVCzQA3igP_0LeuaQ

[Merlin66]

The unit looks like it could do the job, but I'd be a bit sus of an open construction....the other version is more like a robust plastic housing similar to computer power supplies.

 

[iwols]

cheers merlin its going in a pvc box

[iwols]

hi guys regarding the first power supply would an oscilloscope like this,show me how good the power supply is ,im an electrician and  no way an electronic specialist its just that i have various uses for this type of power supply,any advice from electronic hobbyist appreciated

https://www.ebay.co.uk/itm/Hantek-6022BE-Digital-Oscilloscope-USB-PC-Based-20MHz-48M-Sa-s-1M-Byte-CH-2CH-UK/272958959932?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20131017132637%26meid%3Da8f879847ed140978419ea02bcfe8c11%26pid%3D100033%26rk%3D2%26rkt%3D8%26sd%3D172781475372&_trksid=p2045573.c100033.m2042

[RayD]

You wouldn't need anything other than a standard multimeter on a 20VDC range.  You know it's not going to be a totally clean supply so all the scope would show you is the clipped DC profile rather than just the voltage, which really is the bit you are interested in.

It's unlikely anything will go bang, it just won't work.  Just make sure you have the polarity right, and don't go over 15V on anything, as most components will have that as an absolute maximum (I would stick with around 13.5 max) and you're good to go.

If your plastic box is IP rated and your cables are all protected by a decent RCD, then give it a go with what you have and see how you get on.  If it doesn't work you can then look at plan B.

[iwols]

14 minutes ago, RayD said:

You wouldn't need anything other than a standard multimeter on a 20VDC range.  You know it's not going to be a totally clean supply so all the scope would show you is the clipped DC profile rather than just the voltage, which really is the bit you are interested in.

It's unlikely anything will go bang, it just won't work.  Just make sure you have the polarity right, and don't go over 15V on anything, as most components will have that as an absolute maximum (I would stick with around 13.5 max) and you're good to go.

If your plastic box is IP rated and your cables are all protected by a decent RCD, then give it a go with what you have and see how you get on.  If it doesn't work you can then look at plan B.

thanks again ray just wondered how smooth it would be

[RayD]

3 minutes ago, iwols said:

thanks again ray just wondered how smooth it would be

I would think it should be smooth enough.  

These types of supplies are typically designed for CCTV applications and alike, so it should work fine.  There will definitely be some electrical noise but nothing you could do anything about, and as the level will vary from supply to supply, the best way to test it is to try it as you won't know what level of noise your kit kit will tolerate.

[iwols]

cheers ray 

[iwols]

well im going to give  them a try

[gtis]

On 29/11/2017 at 14:10, RayD said:

If you do a google search you will probably find loads of articles for people doing their own hacks to ATX supplies to add their own voltage regulators.

Yes I am in the process of building a bench power supply from a ATX pc supply

[iwols]

well guys, decided im going to try these supplies and ordered a couple 12 v and 5v, even put a cheeky bid in for the oscilloscope so i can check them against a known excellent bench supply will give feedback on these supplies when i get and test them to help anyone else in my quandry cheers 

[iwols]

well supplies turned up ,box and plugs and oscilloscope, so build is on its way, will test the supplies with the scope and leave a comment if any one is interested  3x12v dc socket supply and 1x5v dc ,rj45 connection and a thermometer  on front of panel,not sure if the power supplies will need any cooling and a fan required,will have to see when testing