Also look into MicroAudio SMPS630SO set for 53vdc. Very low noise and provides remote on/off plus auxiliary 5v or 12v always on, +/-15v etc. These are the best supplies for sound quality IMO. These supplies do not suffer from startup hiccup mode and can drive a massive smoothing cap bank. Sami (Cresnet on DIYA) will customize to to your specifications at no extra charge.
Yes I think that's probably the biggest disadvantage of the Meanwell supplies...you do need a larger case. @JLesterP who's designed some high end TPA3255 modules has previously reported here I think that the performance of the LRS Meanwells is good with his boards at least.
I was looking at the Micro Audio power supplies and they look very nice but they are out of my price range for this budget project. The Meanwell I can get is the fanless open frame version so I’m not worried about the fan noise. I was more worried about Noise from the Meanwell at idle. I’ve had issues in the past with industrial style supplies being a bit noisy with no load. I’ve also had good results with the cheap eBay/Aliexpress LLC power supplies so that another cheap option.
Here’s a comprehensive post about a variety of SMPS in the Modulus-86 thread.
https://www.diyaudio.com/community/threads/modulus-86-build-thread.267802/post-7003038
The RPS series seem to be a good bet. They are pretty compact and fanless. Mid-level pricing (less than Connex/MicroAudio, more than common AliExp examples).
I have a pair of RPS-200-27s for a pending build of monoblocks. They are surprisingly small.
https://www.diyaudio.com/community/threads/modulus-86-build-thread.267802/post-7003038
The RPS series seem to be a good bet. They are pretty compact and fanless. Mid-level pricing (less than Connex/MicroAudio, more than common AliExp examples).
I have a pair of RPS-200-27s for a pending build of monoblocks. They are surprisingly small.
I have also used oversized AliExpress 48v 800w SMPS with fans and disconnected the fans. The supplies run way below their rating and don’t really get warm even. If you wanted to, replace the stock fan with a 12vdc Noctua. The AliExpress variants cannot handle a large capacitor bank and will go into hiccup mode. The pair of 4700uF caps on the main PCB are no problem though. I recall that I was able to adjust the voltage output to about 50v max from 48v. Nowadays about $55 here.
You can see me using it here with my TPA3255:
it’s got a pretty clean noise floor:
But turning on and off is not easy like Micro-Audio.
Thanks for the all the great info everyone! It never even occurred to me to buy an oversized power supply so I can run it well below the rated power and disconnect the fan! I decided to buy the fanless Meanwell Rps400-48 locally for around $60 after tax. I figured it was inexpensive, compact, and I wouldn’t have to wait weeks or months for it to arrive.
we have a fully new design TPA32xx with PFFB and will coming soon for high-end diyer.
some new features are:
some new features are:
- one board design for TPA3251/3255 compatible BTL/PBTL
- 2 kinds inductor-7G23B or VER2923,APG2923,HA3588
- MELF resistor for audio path
- Bottom mounted aluminum heatsink
Hello 3eAudio:
Are you planning on a 4-channel version of this? I would really like to have such a product (I have one of your earlier 4-ch amp boards)! If not, can you arrange it so the clocks on two boards can be synchronized to reduce/prevent interference that shows up in the audio band?
Are you planning on a 4-channel version of this? I would really like to have such a product (I have one of your earlier 4-ch amp boards)! If not, can you arrange it so the clocks on two boards can be synchronized to reduce/prevent interference that shows up in the audio band?
Anyone know if these amps play well, all in, with the 600W Vicor Line-48VDC switchers? I think they were made for the telecom industry, should work for our purposes here (a compact amp), no?
Im also curious how those Vicor Flatpak power supplies work for audio. They are made in the USA and not super expensive on the surplus market.
I always wondered if THREE boards could be set to master+slave+slave, using a different slave mode for each slaved board. Do you think that would work? I build multiway active speakers and often need at least 6 channels.
When will the new board be available and what will be the selling price?
I picked up two new Meanwell Rps400-48 locally for $55/ea. They look to be well made and no buzzing or whining noise at idle or under load so I am happy with my purchase. Do you guys recommend some capacitance on the output between the power supply and amplifier board? The power supply seems to startup and work just fine with 10000uf/63v on the output.
End of July or early of Aug.
price around $100
these RPS or EPP are very good option for TPA32xx amp.
surely you may need pay attention on adding external cap on the output(it highlight on their datasheet) not trigger OCP at start-up.