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DIY Purifi Amp builds

LarsS said:
So, power connections are now in place in my amp.
Only remaining part is the connection from SMPS J4 to Neurochrome buffers J2. From one connection to two connections. Need to build new ribboncable, is it possible to have three connectors on one ribboncable or are the leads cut in the connector?
Similar to pic but with three connectors.
View attachment 94361
Click to expand...
You can certainly use more connectors on such a cable, provided the wiring is right. I believe @tomchr has said it is not plug and play (pin to pin). You'll have to confirm pinouts with him, or others who have his board.
 
Well the Eval 1 with Ghent's harnesses are on the way back to Purifi, and the SMPS with my homemade harnesses are at the Post office in the Netherlands awaiting delivery to Hypex tomorrow. Should finally, finally get to the bottom of why the Frankenamp is not working.
 
phoenixdogfan said:
Well the Eval 1 with Ghent's harnesses are on the way back to Purifi, and the SMPS with my homemade harnesses are at the Post office in the Netherlands awaiting delivery to Hypex tomorrow. Should finally, finally get to the bottom of why the Frankenamp is not working.
Click to expand...
I sure hope you like it once all of this is done!

EDIT: I meant, I'm sure you'll like it once all this is done! ;)
 
JimB said:
I sure hope you like it once all of this is done!
Click to expand...

I had better!
Btw, I shared my concerns with Kim of Purifi re the boards being in contact with the back plate. I was told not to worry b/c their model based on the same case touches as well, and it's not problem. So I guess I won't get the back plate modified and save myself a few bucks that way.

All tolled I'm probably around $300-400 over budget what with the shipments of boards back to Hypex including the time customs kicked it back to me, and the custom back end (which ran over $140), and the purchase of the 3m connector, and the purchase of cable from hypex and the purchase of cable from Ghent. Probably closer to $1700 than $1200.

And I still don;t know for certain the root cause. Double checked the aux harness against Ghent's and mine looked perfect and had continuity. It should have worked the first time. I'm really gonna be pist if I find one of the boards was defective to begin with. It will be much better if it turns out to be my own screw up.
 
Hi guys,
I am from TPA325X world, just a question for experts :
Is it possible to use another SMPS LLC PSU other than the SMPS1200A400 to power the Eval. Purifi modules ?
 
daniboun said:
Hi guys,
I am from TPA325X world, just a question for experts :
Is it possible to use another SMPS LLC PSU other than the SMPS1200A400 to power the Eval. Purifi modules ?
Click to expand...
Sure. Several people have done this and commented on their choices earlier in this topic.
 
JimB said:
Sure. Several people have done this and commented on their choices earlier in this topic.
Click to expand...

To avoid reading the 87 pages, can I have a link to a compatible and easy-to-connect alternative power supply?
 
Backplate holes & cutouts all done, polish & paint next.

Ribboncable question, is it possible to have two ribbons into one connector?

1605878003431.jpeg
 
LarsS said:
...
Ribboncable question, is it possible to have two ribbons into one connector?
Click to expand...
Why would you need to do this? You can have one long one with a third connector between the ends. Same result, no?
 
JimB said:
Why would you need to do this? You can have one long one with a third connector between the ends. Same result, no?
Click to expand...

Yes, agree, just investigating if the aesthetics of cable management can be improved in my build ... ;-) not breaking the symmetry ... I know, it’s just me.
 
LarsS said:
Yes, agree, just investigating if the aesthetics of cable management can be improved in my build ... ;-) not breaking the symmetry ... I know, it’s just me.
Click to expand...
How about the strain relief type? Both ends of the ribbon will come out the same side. I've done this in computers. Neat.
1605908741620.png
1605908812973.png

EDIT: Use it in the middle of your cable.
 
Last edited:
Dear audiophiles,

A quick question - given that the stock Purifi EVAL input buffer (as amirm mentioned) reaches max volume at just 1.5V input with the extra gain, how do you guys drive the amp unit? If I am not mistaken, most balanced (XLR) DACs max out around 4V. How do you control the volume?

I am trying to procure a completely new setup from scratch with the Purifi amp, likely a pair of Klipsch RP-8000F speakers and a new balanced DAC that I still need to decide on (currently leaning towards either the Gustard A18 or the SMSL SU-8). My concern is that if the maximum volume is reached at just 36.5% of the max volume of the DAC (1.5/4) that the incremental volume steps are actually quite large. Furthermore, what would happen if the DAC reverts to full output/volume (4V) for example because there was a power reset or something like that, that could mean the end of the speakers. Very keen to find out how to best tackle the volume issue or how you guys drive the amp!

Cheers
 
Aardappel said:
Dear audiophiles,

A quick question - given that the stock Purifi EVAL input buffer (as amirm mentioned) reaches max volume at just 1.5V input with the extra gain, how do you guys drive the amp unit? If I am not mistaken, most balanced (XLR) DACs max out around 4V. How do you control the volume?

I am trying to procure a completely new setup from scratch with the Purifi amp, likely a pair of Klipsch RP-8000F speakers and a new balanced DAC that I still need to decide on (currently leaning towards either the Gustard A18 or the SMSL SU-8). My concern is that if the maximum volume is reached at just 36.5% of the max volume of the DAC (1.5/4) that the incremental volume steps are actually quite large. Furthermore, what would happen if the DAC reverts to full output/volume (4V) for example because there was a power reset or something like that, that could mean the end of the speakers. Very keen to find out how to best tackle the volume issue or how you guys drive the amp!

Cheers
Click to expand...

Upon further research I think the best option would be to add an inline attenuator, such as a fixed Rothwell attenuator. Pardon my ignorance, but which gain reduction level should I aim for (-10, -15 or -20 dB), to bring the EVAL1 back into balance with a typical balanced DAC that has a 4V output Voltage?
 
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