Power supply

[USELESS T]

Hi all

could anyone point me in the right direction.
i have xmas miniture led string lights and the power adaptor has failed on 2 of the sets, could i use any replacement power adaptor or dose it have to be excacly the same?
please see photos
any advice would be extreamy welcome.

thank yall

 

[Jackrae]

You'll need exactly the same specification (voltage, AC or DC and wattage) You'll probably find it easier and cheaper to buy a complete new set. How do you know it's the power modules that have failed and not the actual lighting sets.

 

[SUNRAY]

You'll need exactly the same specification (voltage, AC or DC and wattage) You'll probably find it easier and cheaper to buy a complete new set.

Yes probably true

How do you know it's the power modules that have failed and not the actual lighting sets.

£22 and 4-6 weeks delivery: https://www.ebay.co.uk/itm/33412579...7779&msclkid=c7ebee7f68ee11ea67288b0bd19479ad
£10 and take it home https://home.bargains/product/63771.../prestige-200-led-multifunction-lights?sc=111

 

[USELESS T]

Yes probably true

£22 and 4-6 weeks delivery: https://www.ebay.co.uk/itm/33412579...7779&msclkid=c7ebee7f68ee11ea67288b0bd19479ad
£10 and take it home https://home.bargains/product/63771.../prestige-200-led-multifunction-lights?sc=111

thanks for the reply, i have several sets and the lights work with the other plug adaptors

 

[Harry Bloomfield]

You need one which outputs 4.5v dc and 6watts or more.

Were it me needing one, I would be repurposing a 5v 2amp USB power adaptor, adding a suitable forward biased diode in series, to drop around 0.6v, and that would likely be near enough.

 

[JohnW2]

You need one which outputs 4.5v dc and 6watts or more. Were it me needing one, I would be repurposing a 5v 2amp USB power adaptor, adding a suitable forward biased diode in series, to drop around 0.6v, and that would likely be near enough.

I suppose that would be the 'safest' approach - but if it were me, I'm not sure that I would bother with any adapting/ 'repurposing'. For a start, the 4.5V output of the original may well not be all that accurate and, even if it is, what's 11% between friends ?

Kind Regards, John

 

[Harry Bloomfield]

I suppose that would be the 'safest' approach - but if it were me, I'm not sure that I would bother with any adapting/ 'repurposing'. For a start, the 4.5V output of the original may well not be all that accurate and, even if it is, what's 11% between friends ?

The LED's in Christmas chains seem to be already close to the limit, the 11% will reduce their life even more.

 

[ericmark]

Had a look at my own lights, seems same spec. Easy timer, to set and reset timer press button for 3 seconds, 8 hours on/16 hours off, green light - timer is on. 8 function push button controller with timer. It then goes on to list the 8 functions.

So it is not a simple power supply. Maybe you can make the lights work, but not like orignal.

 

[JohnW2]

The LED's in Christmas chains seem to be already close to the limit, the 11% will reduce their life even more.

Possibly.

I've had several sets of lights like the OPs and, as per his experience, it's always been the PSUs, not the LEDs that have failed first. Because of that, I measured the output of a couple of the "4.5V" PSUs (when they were working!), whilst they were running their LEDs, with the same idea as you - hence to determine how much I perhaps ought to 'drop' the voltage from a 5V PSU to get close to the 'on load' output voltage of the supplied PSUs - and both of them appeared to be outputting around 5.6 V 'on load' - so I concluded that no 'dropping' was required

Kind Regards, John

 

[SUNRAY]

If that is supplying a set of lights that have any sequencing, a straight forward DC power supply will light only half of the LEDs.

 

[JohnW2]

If that is supplying a set of lights that have any sequencing, a straight forward DC power supply will light only half of the LEDs.

That was must first thought, but, on reflection, I see nothing in the labelling, nor any 'sequence control button' or suchlike,to suggest that it's anything other than a straight PSU. Indeed, if it were a 'polarity-reversing' sequencer, then this would be both misleading and meaningless ...

Kind Regards, John

 

[robinbanks]

£22 and 4-6 weeks delivery

Think your eBay-fu let you down there

A tenner on the slow boat from China:

Pardon our interruption...

Twelve quid from this country, maybe in time for Xmas:

Pardon our interruption...

As John says, looks to be a straight power supply so anything that is 4.5v and 1.2 amps (1200mA) or above should be fine if one is comfortable with mating the connectors (snip the wires if it's certain that the plug on the LEDs doesn't contain some flasher unit etc) - possibly a better option if multiple of the original power supplies have failed - bad batch or inherent flaw?

 

[Harry Bloomfield]

and both of them appeared to be outputting around 5.6 V 'on load' - so I concluded that no 'dropping' was required

Sounds like the could be uncontrolled, transformer supplies. The ones here, are all SMPSU's, and a quick check suggests they are tightly voltage regulated.

Despite this, a couple of the chains have sections of LED's out, which was why I assumed they might be run near the limit. Unlike most LED's, they only need to survive a few days of Christmas.

 

[ebee]

That was must first thought, but, on reflection, I see nothing in the labelling, nor any 'sequence control button' or suchlike,to suggest that it's anything other than a straight PSU. Indeed, if it were a 'polarity-reversing' sequencer, then this would be both misleading and meaningless ...

View attachment 324592

Kind Regards, John

Of course manufacturers or chinese exporters amongst other never are misleading or meaningless

 

[JohnW2]

Of course manufacturers or chinese exporters amongst other never are misleading or meaningless View attachment 324623

Of course they aren't

Mind you,if it repeatedly reverse the polarity,I suppose they would have had to toss a coin to decide how to draw that diagram

Kind Regards, John