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Old 02-10-2015, 07:18 PM #1
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Exclamation Can I replace a 5V 1A power supply with a 5V 2.5A power supply ???

Hi to all the forum.
Sometime ago I have bought from China this device:

Mini Laser Luce Effetto Lighting Proiettore per DJ Disco Stage Party Show Club | eBay

It was at 1/3 of that price, but after 2 working hours, the power supply starts to emit strage sounds and then popped.
I substitute the original broken alim with an old power supply, more powerful (2.5A instead 1 but at the same voltage). After few seconds the device burned. So I decide to bought another device from Germany thinking to receive a better alim, but I received the same power supply. Now the device works, but the alim starts to emit the same disturbing sounds.
So, I do not know if the first device was damaged by the popped alim, and I do not know if this device needs to be current limitated and want only 1A and not 2.5, but now I'm scared to kill another device.
I wish to know if a device originally powered with a 1A alim can work safe with a 2.5A one.
Also, I do not know if under load the 2.5A alim shows different performances from the 1A one, in terms of current and/or voltage.
The only test that I have done was to connect a multimeter to the 2.5A alim and leave it working for 12 continuosly hours: the voltage output is stable at 4.8V, but remember that it is not under load.
What is Your opinion? What kind of tries I must do to confirm the goodness of the 2.5A power supply?


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Old 02-10-2015, 07:49 PM #2
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Default Re: Can I replace a 5V 1A power supply with a 5V 2.5A power supply ???

The device is voltage driven, the power supply current rating is just the maximum that it can supply.

A voltage driven device that runs at a current lower than 1A will draw the same current from both a 1A rated PSU and a 2.5A rated PSU. (Assuming the PSU's are at the same voltage).
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Old 02-11-2015, 12:47 AM #3
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Default Re: Can I replace a 5V 1A power supply with a 5V 2.5A power supply ???

Hello Arg.
I tried to replace the 1A with a 2.5A with same voltage: the device works very bad!
The green laser stay off, while the red one emit a weak beam.
Also the motor spin in a very slow manner.
I think that this device needs a custom power supply!
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- Jetlaser PL-E Pro Focusable 445 nm 4000 mW Peak 3500 mW Average With Jetlaser 10x Beam Expander
- Mrcrouse Zaser Black Anodized Custom Head/Pill 445 nm 4970 mW Peak 4670 mW Average With Laserglow Modified Recoated 10x Beam Expander
- Sinner Cypreus IIIb 450nm 4757mW With Three Elements Glass Lenses And Adapted Linos 10x Beam Expander
- Sinner Cypreus II XL Gold Plated 24k 465nm 4200 mW Peak With Three Elements Glass Lenses
- CDBEAM Blue Balista 467nm 5088mW Optical Corrected 8 Lenses System
- CDBEAM Verde Volcano 520nm 2600 mW Dual Diode Build With PBS, Corrective Optics, Variable Output Power And 10x Variable Magnification Linos Beam Expander
- Laserglow Hercules 600 532nm 650 mW With Adapted 8x Linos beam expander
- Jayrob Aurora Stainless Steel 18650 532nm 195mW Peak 181 mW Average
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Old 02-11-2015, 01:32 AM #4
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Default Re: Can I replace a 5V 1A power supply with a 5V 2.5A power supply ???

If you're noticing a difference between the power supplies then it is likely that one of them is faulty.
In theory they should both work the same.
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Old 02-11-2015, 01:58 AM #5
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Default Re: Can I replace a 5V 1A power supply with a 5V 2.5A power supply ???

Can you measure the voltage and current under load?
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