Hi all, I have a newbie question about the power supply for Purifi amp module.
I am thinking of building a linear power supply for the amp as I have a spare toroid transformer lying around (removed from a dead amp).
Now the issue is that the transformer has 4 x 50V (6A each) secondaries instead of 65V. Are there any issues with using 50V instead of 65V for the power supply?
I am thinking of building a linear power supply for the amp as I have a spare toroid transformer lying around (removed from a dead amp).
Now the issue is that the transformer has 4 x 50V (6A each) secondaries instead of 65V. Are there any issues with using 50V instead of 65V for the power supply?
After rectification your 50V will be around 70, so you might need to drop some voltage to get to 65. You will have ti consult the technical documentation from purifi to figure out what is acceptable.
Hi Thanks for the reply. The manual says 25-70V. Typical 65V. So, as long as I keep it to the range its ok? Are there any issues if supplied voltage is below 65V (like max power output will be lower)?
There will be a bit of drop going through the linear power supply, so a bit less than 70V likely already, and that will drop further under load. That said, my own preference would be to err within the recommended range. If you supply with less voltage, yes, the maximum output power will be reduced.
Does anyone here have experience with powering a single channel Purifi 1ET400A from an SMPS?
The Purifi requires a V- referenced gate drive supply, and the only supply that provides that which I can find is a 1.2kW Hypex smps, which seems overkill for a single channel (monoblock) 1ET400A.
Advise?
Jan
The Purifi requires a V- referenced gate drive supply, and the only supply that provides that which I can find is a 1.2kW Hypex smps, which seems overkill for a single channel (monoblock) 1ET400A.
Advise?
Jan
https://de.aliexpress.com/item/1005004686391228.html
Just found this offer from our Chinese admirers. Probably license production?
Even the on-off switch is waterproof- beat that!
Just found this offer from our Chinese admirers. Probably license production?
Even the on-off switch is waterproof- beat that!
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@Cresnet from MicroAudio will likely have a SMPS you could use, or may build one to your specs. I think the SMPS630-G can be ordered to suit the 1ET400A.
https://micro-audio.com/store/product/smps630-g/
You could use a small transformer and a regulator for 15V , independend of the rest of the power supply. Not connected to ground or chassis!
If I get the data sheet right, then you connect the negative side of this aux supply to the negative feed (65V) of the main supply, it should give the desired 15V VDR reverenced to -VP. As it only has to deliver 35mA per amp, this could be a very small SMPS module, for example.
If I get the data sheet right, then you connect the negative side of this aux supply to the negative feed (65V) of the main supply, it should give the desired 15V VDR reverenced to -VP. As it only has to deliver 35mA per amp, this could be a very small SMPS module, for example.
Hi Jan,
May I ask what's your final solution?
Did you choose hypex 1200 SMPS later?
I will be curious to hear your thoughts when you have the purifi modules up and running! I have been curious about them. spendy however for a maybe
Nothing much to say. They take an input signal and provide a bigger output for a low impedance load.
As an amp they are pretty much a wire with gain. And they stay cool.
Jan
Thanks so much!
I just bought the 1ET9040BA module and now I'm considering to go for hypex SMPS or supply the power from separate SMPS. It seems quite few people use separate SMPS like Mean Well to supply power for Purifi / Hypex amplifiers.
I mean using 2 SMPS to form the +/G/- rail since most SMPS if not for music did not have negative rail.
I haven't tried this before and most of the purifi/hypex amp module users seem to use hypex SMPS so I'm not sure if there's some drawback using SMPS like Mean Well ones.
Last time I check on mouser the SMPS has +- rails only provides around +-12 or +-15V.
I haven't tried this before and most of the purifi/hypex amp module users seem to use hypex SMPS so I'm not sure if there's some drawback using SMPS like Mean Well ones.
Last time I check on mouser the SMPS has +- rails only provides around +-12 or +-15V.