LED Christmas tree

[Harry Bloomfield]

Except 12V is unlikely to light a string of LEDs designed for 24V.

But it would be a safe voltage to apply to the lights initially - if they don't light, then the OP can add more volts.

 

[SUNRAY]

But it would be a safe voltage to apply to the lights initially - if they don't light, then the OP can add more volts.

Or more likely: they come onto a help forum on the internet and someone recommends testing it on a very low voltage which does nothing... so they throw it away thinking it's broken.

 

[Harry Bloomfield]

Or more likely: they come onto a help forum on the internet and someone recommends testing it on a very low voltage which does nothing... so they throw it away thinking it's broken.

So, taking your theory a stage further - they apply too high a voltage, blow that lot, then throw it away. The difference is what?

 

[SUNRAY]

So, taking your theory a stage further - they apply too high a voltage, blow that lot, then throw it away. The difference is what?

The difference is: I'm suggesting using the voltage the system is designed for, IE the correct voltage.

 

[Harry Bloomfield]

The difference is: I'm suggesting using the voltage the system is designed for, IE the correct voltage.

We don't for sure know what voltage it is designed for, do we? LED's can be run on much higher voltage than their design voltage, proving the supply is pulsed on and off rapidly, with a suitable mark space ratio. I'm pretty sure, feeding with 12v, will provoke a response from them, without much risk of destroying them, if no the OP can then try more volts. If however, the OP starts high, and destroys them, there is no way back..

 

[ericmark]

I have a collection of power supplies for printers and routers 24 volts some AC and some DC, and I am sure I could find one to test with. But since I often leave Christmas lights unattended, I would simply buy new.

 

[SUNRAY]

We don't for sure know what voltage it is designed for, do we?

View attachment 360769That'll be AC then

Oh and 24V

 

[Harry Bloomfield]

Oh and 24V

24V AC. Which means each LED will be only be lit, for less than half of the time, 50% duty. Tested on DC, they would be lit the entire time 100% duty.

Note the difference, and why I suggested testing with 12v.

 

[SUNRAY]

24V AC. Which means each LED will be only be lit, for less than half of the time, 50% duty. Tested on DC, they would be lit the entire time 100% duty.

Note the difference, and why I suggested testing with 12v.

Let's see if OP comes back with results.