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DIY Purifi Amp builds

Thomas savage

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SMPS630-G

•Unregulated SMPS.
•Selectable input voltage range (110 VAC / 240 VAC).
•Multiple output voltage range (+-40 VDC ~ +-95 VDC). Single or dual. NOTE-1
•Standby switch input eliminates the need for mechanical switches.
•Onboard standby power supply with two outputs (+12VDC & +3.3VDC).
•Amplifier enable output (OPTO Isolated).
•DC Error input.
•Regulated AUX output +-5 VDC ~ +-18 VDC.
•IDC connector can select regulated or unregulated AUX voltage via jumpers.
•Bootstrap VDR supply output +12VDC ~ +18VDC (Completely isolated output) should be tied to –HV in class-d amplifier applications.
•AC-Line loss detection

Coming soon.
We do have a area for commercial entities to promote their products.

https://www.audiosciencereview.com/forum/index.php?forums/desperate-dealers-forum.37/

You can start a new thread here .
 
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JimB

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I would like to apologies for everyone, I didn't mean to disturb this thread in any way.

Will make new thread later.

Thanks
No worries! I think it was great to hear of it here, but then go to your new thread to have more discussion and details.
 

Matias

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FYI Purifi is working on new amp modules with higher power and power supplies (source: this month's Audioxpress magazine Purifi's factory tour article).
 

maty

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FYI Purifi is working on new amp modules with higher power and power supplies (source: this month's Audioxpress magazine Purifi's factory tour article).
https://www.audiosciencereview.com/...ds/vera-audio-class-d-amp-build-quality.9895/

-> https://www.audiosciencereview.com/...a-audio-class-d-amp-build-quality.9895/page-4

Vera Audio P150/600 RS by Bjorn

[ In 4 Ohm it delivers 1kW with amazingly low 0.0006% THD+N. This is bridged, but it says a lot about the performance. The "notches" you see in the graph below comes from our measuring equipment switching measuring area and isn't able to keep up with such low numbers. The actual distortion around 50-500W is even lower. Probably down towards 0.00025%. ]

[ * We use a huge power supply of 3kW. This has plenty more capacity and runs cooler at heavy loads. It will also result in much lower distortion at low frequencies (at high loads)

* Our amplifier is (as far as we know) the only Purifi model that has bridging capability. A lot of testing has been done and special considerations are in place to make this work as it should. Looking at the measurements of 1kW with 0,0006% distortion proves this is flawless... ]

Hypex SMPS3kA400
https://www.hypex.nl/product/smps3ka400/32
 

Matias

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Yes, I saw that, 3k usd for the stereo Vera amp or 6k for 2 units running bridged. Seems like an excellent option already.
 
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All screwed in and hooked up, visually checked a couple times, but no electrical testing done yet. Modushop chassis is really nice, and 230mm x 280mm is plenty of room for my simple purposes. Planning on simply butting SMPS to the 10mm faceplate for now, but strongly considering thermal adhesive pad and/or even drilling and screwing. Shortest thermal path. Leaving option for LED or switch on faceplate.

Corner screws on SMPS1200 weren't fully countersunk, creating a gap between bottom plate and chassis. Instead of countersinking further, just removed the corner screws and replaced with slightly longer ones from chassis bottom.

The back plate is perfectly machined from Modushop, but had to Dremel out some chamfers for the outer Deltron pins under the EVAL1. Would recommend forgoing the 1mm recess, as the XLRs are rated for 3mm chassis thickness. Not sure about the Deltrons, but not planning on using them anyway. All about the speakONs...

Overall, a really easy and clean build so far. Glad I got both the Hypex and Purifi cable kits, though of course the second Purifi kit was total excess.* Had I planned better, would've just drawn it all out and had Modushop drill the bottom plate. Unnecessary drama, and luckily ended up only about 0.5mm out at various points.

* EVAL1 kit comes with all the necessary EVAL1 cables; I used all of them. I unnecessarily ordered an extra EVAL1 cable kit.. The Hypex kit includes a 120V jumper and line power cable that EVAL1 kit, naturally, doesn't.

IMG_7720.jpg IMG_7721.jpg IMG_7722.jpg IMG_7723.jpg IMG_7724.jpg
 
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If only, though I do prefer stainless to black oxide, and black stainless is pretty much unobtainium. :)
If only, though I do prefer stainless to black oxide, and black stainless is pretty much unobtainium. :)
Albany County Fasteners has black anodized stainless hardware. They're a great, inexpensive source for stainless hardware, I use them in all my projects.
https://www.albanycountyfasteners.c...crew-4-40-Black-Oxide-Stainles-p/12070000.htm
Mike
 

maty

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Having cables run close to electronics is usually not a good idea. If they also barely keep distance with the coils ...
 

boXem | audio

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Cute! I see you had your own board made. Once you are happy with it, are you able to share some details?
Sure!
Basic idea is to have a drop in replacement NC400 -> 1ET400.
Electrical interfaces being the exact same as NC400
- integration is easier for beginners (one wire for enable, the rest is straightforward)
- pre-made cables are easy to find for new builds
- one could retrofit an existing NC400 amplifier by simply drilling new holes in the chassis

Possible configurations:
Mono v1: 1x SMPS600N400 + 1x buffer + 1x 1ET400A
Mono v2: 1x SMPS1200A400 + 1x Hypex SMPS1200 to NC400 adapter + 1x buffer + 1x 1ET400A
Stereo v1: 2x SMPS600N400 + 2x buffer + 2x 1ET400A
Stereo v2: 1x SMPS1200A400 + 1x Hypex SMPS1200 to NC400 adapter + 2x buffer + 2x 1ET400A
Stereo v3: 2x SMPS1200A400 + 2x Hypex SMPS1200 to NC400 adapter + 2x buffer + 2x 1ET400A
...

The buffers include regulators (LT3042/93) and an OPA1612.
The version you see has fixed gain, I may add one resistor and two jumpers for 3 gain settings (unity + 2 others) for production boards.
 
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