Hi. I want to replace this switch mode with a linear supply. I understand the +12v, -12v, and GND. But what is the 5VD for? 5v dc one side positive one negative? It is not really making sense to me since the power supply only outputs +-12v. Can anyone please explain this to me and possibly suggest a board that I can stuff, that will work with this? I found this LPS , but I rather build one that is hopefully better, it doesn't have to fit in the case. Thanks.
There are probably some voltage regulators on the PCB that regulate the 12V from the SMPS down to 5V. So you will probably only need to supply the +-12V to the board, as the PS is currently doing.
I am curious what you will come up with, 12V at 2A will need a substantial mains transformer, that will quite sure not fit in there.
I am curious what you will come up with, 12V at 2A will need a substantial mains transformer, that will quite sure not fit in there.
This LHY audio one for this is only 25vac. The + side is 2 amp but the - side is only .25 amp which should be 27vac transformer. Does anyone know how that works?
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I admit I am lost. To start, can you tell what device you have there? What are your skills with electronics? And what alternatives have you looked at?
It is the Eversolo DMP-a6. I was thinking of buying it and upgrading it. Teddy Pardo has a good upgrade option but it is $500 and I was looking to spend a lot less. I have only built a wolverine amplifier so far. I am not an expert but I know the way around the internals a little bit.
I see, interesting product! I saw this power supply as well https://www.beatechnik.com/product-page/lps-a6-eversolo-dmp-a6 , less than 500.00.
You can probably make it yourself for less money by gathering unpopulated PCBs, components from eg Mouser or Digikey and so on. You will learn a lot along the way, that is our DIY spirit 🙂 but it will take time and probably be not as nice looking as eg the LPS-A6.
Why did you previously write you need a 27V AC transformer? I would look up some tutorials on how to make a regulated linear power supply. It starts with transformer, rectificiers, filtering caps, regulator, output caps... Other people here used kits from this shop to make low noise PS.
https://www.diyinhk.com/shop/audio-...e-dac-power-supply-regulator-3357v-14ax2.html
Disclaimer 🙂 I can understand that you want to try a different PS, I do that in my projets as well. I am not claiming that one sounds better than the other.
You can probably make it yourself for less money by gathering unpopulated PCBs, components from eg Mouser or Digikey and so on. You will learn a lot along the way, that is our DIY spirit 🙂 but it will take time and probably be not as nice looking as eg the LPS-A6.
Why did you previously write you need a 27V AC transformer? I would look up some tutorials on how to make a regulated linear power supply. It starts with transformer, rectificiers, filtering caps, regulator, output caps... Other people here used kits from this shop to make low noise PS.
https://www.diyinhk.com/shop/audio-...e-dac-power-supply-regulator-3357v-14ax2.html
Disclaimer 🙂 I can understand that you want to try a different PS, I do that in my projets as well. I am not claiming that one sounds better than the other.
That 27 is indeed DC power, so W. You will need a mains transformer with primaries of 115VAC (as you are in the USA) and secondaries around 12VAC and 3A. This will be rectified and filtered to about 12V AC* sqrt(2) - voltage drop over diodes, so about 15VDC, which you will have to regulate down (LT1085 for example, probably there are quieter ones out there) to 12VDC. There is a 3VDC over this regulator (15V in and 12V out), and if the circuit pulls 2A from it you will need to dissipate about 6W of power (3V drop * 2A current), which requires a nice heatsink. Similar for the -12V, but there you will have less heat in the regulator, probably won't even need a heatsink.
Thanks. Those dac kits might be more along the line of what I'm looking for. I didn't know they existed. Do you know of a build guide or thread for building a complete dac or streamer from any of them?
@ErikdeBest will a transformer that is 50w, 115 primary, 12v x2 secondary work? Do I need the 12-0-12 kind?
Did you measured the 5VDC on the pins ? if look at the right side, there is an identical slot where these voltages should be found identical ... try measuring without the 6 wires connector attached. This way you can find out if the voltage is coming from the motherboard toward the SMPS or it is delivered FROM the SMPS toward the motherboard. Or ... maybe there are no voltages at all ... on those pins
I did not. Decided to go with a different product. But the 5v input is just jumped from the 12v input. So you don't need to do anything special for it, just hook up the 12v
I bought this one https://vi.aliexpress.com/item/1005003501444070.html?gatewayAdapt=glo2vnm from Ali Express and I'll improve it with a better transformer, shielded in iron and the entire ansamble will be also shielded in an iron box. The schematics is also modified by me. I added a controlled zenner diode and I'll also add a second rectifier for the negative voltage.
Idk know if I would trust that power supply. Might be worse than the stock one. You want to actually improve the quality of the power, not just use linear power supply
You are correct, but that one is actually a clone from an original one... all I need to do is just modify a little the schematics. So, here it is the original and is quite good. All you need is to replace the capacitors with high quality ones https://www.amb.org/audio/sigma22/s...22 regulated power supply&d=Schematic diagram
FYI, The LHY one is under powered compared to the stock one. I'd copy the Teddy Pardo one or use the Ian Canada ones, you'll get a better outcome. The LHY one is still rather noisey.