How can I test with a multimeter if two identical 2.5Ampere 15 Volt wall wart Smps can be connected like this? In order to replace a classic transformer?
Do I have to remove the rectifier or rewire the power supply input on a existing amplifier board?
+ 15
- + 0
- 15
That's the amp board
https://www.diyaudio.com/community/...fication-to-current-drive.389985/post-7267663
Do I have to remove the rectifier or rewire the power supply input on a existing amplifier board?
+ 15
- + 0
- 15
That's the amp board
https://www.diyaudio.com/community/...fication-to-current-drive.389985/post-7267663
You need to make sure there is no mains earth continuity from the '0' of the output to the mains ground pin (if it has one). If there is then you would end up with a dead short as you connect the +15 of the lower one to the 0 of the upper one.
In other words both need to be truly floating. If they are then all you can do is go ahead and try it.
In other words both need to be truly floating. If they are then all you can do is go ahead and try it.
@Mooly
is a Meanwell SMPS appropriate like MW LRS-75-36 , 75 W, 36 V, 2,1 A ?
want to use a pair of them for powering LM3886 TF and use cooling fans for PC, just thinking about how to fix the LM3886 to cpu heat sink.
Want to make a current driven LM3886 with XY board like Adason in his project.
Do I wire the smps to this point like plus (left) plus minus (middle) minus (right) - correct?
is a Meanwell SMPS appropriate like MW LRS-75-36 , 75 W, 36 V, 2,1 A ?
want to use a pair of them for powering LM3886 TF and use cooling fans for PC, just thinking about how to fix the LM3886 to cpu heat sink.
Want to make a current driven LM3886 with XY board like Adason in his project.
Do I wire the smps to this point like plus (left) plus minus (middle) minus (right) - correct?
It will only work if there is no continuity between the earth symbol tag on the PSU and the -V tag on the PSU.
The -V and +V on the PSU have to be truly floating to allow you to wire them in series. If they are floating you wire +V of one to -V on the other and that point becomes the ground or zero volt line for the amp leaving you with the +V and -V rails.
It is just like wiring two 9 volt batteries in series to a -9/ 0/+9 volt supply.
The -V and +V on the PSU have to be truly floating to allow you to wire them in series. If they are floating you wire +V of one to -V on the other and that point becomes the ground or zero volt line for the amp leaving you with the +V and -V rails.
It is just like wiring two 9 volt batteries in series to a -9/ 0/+9 volt supply.
so if the volt meter shows zero ohms between the earth symbol, third from the left side and V- out, forth from the left then its ok?
corresponding for a wall wart: If the plug has no mass, has a flat plug, then it is truely floating?
corresponding for a wall wart: If the plug has no mass, has a flat plug, then it is truely floating?
even if the meanwell smps would show connection between earth ac and v- dc, wouldn't it remedy the situation just not using the mass/earth by not connecting it to the ac electricity net?
No, its not OK if it has continuity because then you are directly shorting on the supplies out when you make the connections to join them in series.
That could be dangerous and can't be recommended.