WELL! I find that interesting. Has anyone confirmed that these work as intended on the 1ET400A? And if so, will Hypex sell them for DIY?
I strongly doubt that they would (indirectly) help the competition
WELL! I find that interesting. Has anyone confirmed that these work as intended on the 1ET400A? And if so, will Hypex sell them for DIY?
- SMPS1200 has Amp Ena and Amp Err I/O pins, these are compatible with Purifi Amp Ena and Err pins. If you connect them, these will replace the on/off switch on the eval board (not necessary to desolder that) and you can do soft power on/off from SMPS.
I was consistently getting high pitch tones, whith slightly different pitch for different amps (I had four in total) and sources...I am curious. What happened?
In a simple test set up it will measure OK, nothing wrong with the op amp itself. The problem you have is it has no GBW limitation or input filtering. Without feedback caps it is wide open frequency response. Put it in a real world situation and you can see problems, RF, or other out of band noise (dacs) / IM. It will be unpredictable and many have commented on it sounding not great.Beside the reciprocal trolling/agenda aspects here, I would still be interested in seeing that nc500 evaluation board measured.
IIRC at least the first nc500 offering (from Nord and the like, but also from boutique vendors) were using that board, probably unmodified.
Does the purifi evaluation board also have the same so-called limitations?
After all it is marketed as an "evaluation platform" just like the nc500 one.
In a simple test set up it will measure OK, nothing wrong with the op amp itself. The problem you have is it has no GBW limitation or input filtering. Without feedback caps it is wide open frequency response. Put it in a real world situation ad you can see problems, RF, or other out of band noise / IM. It will be unpredictable and many have commented on it sounding not great.
I am referring to the Hypex Nc500 eval board that pos asked how it measured. The Purifi is fine in my experience.That's odd. I have not seen any comments about the Purifi modules with the eval board not sounding great. Can you please share a link.
I am referring to the Hypex Nc500 eval board that pos asked how it measured. The Purifi is fine in my experience.
Did they go away when you turned your dac off (I'm assuming directly connected)I was consistently getting high pitch tones, whith slightly different pitch for different amps (I had four in total) and sources...
These were AMS1000 modules operating in bridged mode.
Can you please clarify how the standby mode operates. I'm reading the application notes on an iPhone so difficult to make out.
As I understand it, SMPS1200 J4.6 connects to EVAL1 J3.1 and SMPS1200 J4.10 to EVAL1 J3.3?
And 5V DC supply is connected to SMPS1200 J5.1 and J5.5?
Thanks, M
Thanks for clarifying since pos asked "Does the purifi evaluation board also have the same so-called limitations?"
You are right and sorry for my indefinite description; SMPS1200 J4.6 connects to EVAL1 J3.1 and SMPS1200 J4.10 to EVAL1 J3.3 it will give you soft start, eval board switch bypass features and SMPS can switch the power off when amplifier in trouble.
Same connectors contain +18V / -18V / GND for the eval board, just set jumpers to "unregulated power" on SMPS before use it;
SMPS1200 J4.1 -> EVAL1 J3.5 +18V
SMPS1200 J4.2 -> EVAL1 J3.6 GND
SMPS1200 J4.3 -> EVAL1 J3.7 -18V
5V DC supply; I did not use it, I had a 12-24V DC -> 5V DC supply in my electronic gadgets drawer , so I use the SMPS 18V rail to feed external circuits with 5V and never let SMPS to go standby mode. If you have an AC 110-220V -> 5V DC supply, than you can do real standby mode.
Although this is conjecture as I am not familiar with the ams modules, It's possible in that case that is the problem I am describing with an unfiltered input. HF Dac noise.Not sure anymore, but at least I think it was silent when the source was unplugged or the input was shorted.
[...] can anyone tell me if there is a reason to use (or not) the SMPS1200A700 instead of the A400?
I know Hypex sells a softstart module, but not sure if its needed.
Only for non switch mode PSUs.
Good start. I do know that the Purifi cable set includes the housings for the SMPS1200A400 ends of the cables - you just have to insert the free, crimped ends into the proper holes. They do NOT include two free wires for the (highly recommended!) nampON and nFATAL connections described by Dudi:Has anyone made any progress on one of these builds? I am trying to get a list of items to purchase and would appreciate any thoughts on additional items I might need.
From the Purif Shop, the 1ET400A Eval kit for DKK4700 (about $705 US);
from Hypex DIYclassD, the SMPS1200A400 for 180 euro (~ $200); and
from Ghent audio, the NCORE-SE(300W) case for $230 - its a little wider.
I will likely add the Purif cable for DKK75.00 (~$22.50). Not sure how much of the Ghent kit will be useful so may need additional cabling. Any other ideas? I know Hypex sells a softstart module, but not sure if its needed.
Also, can anyone tell me if there is a reason to use (or not) the SMPS1200A700 instead of the A400?
Thanks