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DIY Purifi Amp builds

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Just to make sure as i'm no electrician...
Voltage between pin 2 of J3 connector and what other point?
Currently i'm not using that pin J3.2
And ground GND (could it be also gold plated area around mounting holes on EVAL1 PCB which is also grounded).
Thanks in advance!
 

Luc

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And ground GND (could it be also gold plated area around mounting holes on EVAL1 PCB which is also grounded).
Thanks in advance!
Hummm... the measurement is not very precise. My dmm's probably a bit cheap.
Unstable measure, but anyway less than 100mV
 
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Could you please share some specs on that SMPS, and the advantages compared to an hypex one?
What about the efficiency curve at low levels? What is the idle power consumption?
SMPS in STANDBY mode power consumption is 1.9W

SMPS in RUN mode power consumption is 10.7W Amplifier not connected

Hope that answers your question.

Thanks
 

Attachments

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Jun 12, 2019
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Thinking about some purifi diy amps, are the eval kit buffer sufficient ? I dont care about 1% neurochrome improvement for 120Dollar as an example
Chain ist Trinnov Altitude 16 to auverdion DSP with +6db Output to purifi
 
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Luc

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i find the purifi buffer board sufficient.
i hesitated taking the nord buffers, but pricey... the nice thing is to put the opamps of your choice ;-)
for me the neurochrome buffer is of little to no interest
 
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JimB

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Thread Starter #1,389
Based on documentation R6_A1/A2 resistors should not be present for HW mode.
View attachment 72905

My board looks like follows.
View attachment 72907
There is a smd element without description but with white line.
My board seems to be somehow 50/50 in HW/SW mode :)
Do you have similar smd in place of R6_A1/A2?
I have four boards - none are populated there.
 
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OK, Purifi gave me a few more details regarding this mono input buffer, and I'll just copy and paste it here from the email they sent me. Pretty sure they won't mind, as if this were confidential they likely wouldn't have shared it with me. It's free marketing for them :)
  • 14dB SE/Ballanced gain stage based on OPA1612 with Panasonic thin film 0.1% resistors and Kemet NP0 linear capacitors.
    total system gain is 27dB as for the EVAL1 kit
  • Gain stage can be bypassed
  • Very low noise and low output impedance linear regulators for the gain stage and for analog circuits on the 1ET400 module
  • Available with XLR/Speakon connectors or without
Prices aren't final yet and they hope to have it on the webshop by early June. Their current thinking is a price of 150USD for the fully stuffed version and around 135USD without XLR/Speakon connectors.
The board is manufactured and tested in DK
Any News on this ?
 

Luc

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But the Nord is more than 350 Euro per Channel, thus isnt cheap as well, right ? This ist the Same price than the amp channel
Yes, you're right. Very expensive and that's why i did not do that from the beginning. although i really would like to be able to switch opamp and voltage regulators easily
 

March Audio

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SMPS in STANDBY mode power consumption is 1.9W

SMPS in RUN mode power consumption is 10.7W Amplifier not connected

Hope that answers your question.

Thanks
Im no expert on the regulations, but doesnt the EU now mandate that standby power must be below 0.5 watts?

Might not be relevant for DIY products
 

somebodyelse

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JimB

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Thread Starter #1,399
Interesting...
Are you using J3.2 READY signal in any of your boards? I’m curious what voltage level you have there.
I'm not using that and am not able to check it right now. Hopefully someone else can test that for you to compare. It should be 3.3V logic.
 
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Maybe someone can help me with some feedback. Thinking about 3 Stereo Purifi amps, but in one case. Looking at Apollon Audio they use 3x Hypex 1200 for 3 Channel ! Looks a bit weird with an amp rated 450W, right ?
My idea was one microaudio with 700w or 1000w for Stereo but in comparison this is way less than what Apollon uses.
 
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