Some fun to be had, fitting 5 channels into a repurposed case. 
Did try out a vertical arrangement but the power sockets limited the space advantage somewhat. Would be interesting to see an input buffer board maybe like a PC that plugs into a mini motherboard.
More work this weekend.
Purifi-1et400a build
Did try out a vertical arrangement but the power sockets limited the space advantage somewhat. Would be interesting to see an input buffer board maybe like a PC that plugs into a mini motherboard.
More work this weekend.
Purifi-1et400a build
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Did you use one power supply? Or is it a custom power supply?Some fun to be had, fitting 5 channels into a repurposed case.
Did try out a vertical arrangement but the power sockets limited the space advantage somewhat. Would be interesting to see an input buffer board maybe like a PC that plugs into a mini motherboard.
More work this weekend.
Purifi-1et400a build
Power supply is a single standard Hypex SMPS3kA400 2 x 65 VDC 3000 Watt, which is at the limit of a UK 13A fused plug. Will only be driving 8 ohmn speakers, so should be okay.
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They are not in series, it is an input board and one Purifi amplifier board per channel. as far as I can see.
I explained it elsewhere in this thread but not it is getting quite long, and it is easy to miss some info.
I am using the Neurochrome input buffers as breakout boards – in fact bypassing the active circuitry completely and in fact the most "active" part on them are the Hypex regulators on the daughterboards, for the comparator/modulator circuitry.
So I am using just one buffer, the Neurochrome Universal Buffer (which is slightly better, at least on paper). The reason I am doing this is that I originally bypassed the buffers on the FE02 board. Then Tom Christiansen asked me to test his boards, so I got them for free. Once we debugged a configuration matter on the prototypes, and verified that all was working wonderfully (without the Neurochrome UB in the audio path, of course), I put the UB back and bypassed the Neurochrome input buffers.
Roberto
Roberto
I zoomed in on your other pictures. It appears all 3 boards ARE NeuroChrome boards (maple leaf logo), just a different color PCB (green) than what is depicted on their web page (blue).
Sorry, my confusion.
They have 2 products. One is single channel board specific to the Purifi/NC500 boards and the other is a 2 channel Universal Buffer board.
Purifi 1ET400A / Hypex NC500 Input Buffer – Neurochrome
Universal Buffer – Neurochrome
You can buy front end boards from VTV Audio......they have options for dual 8 pin dip and also mono Pro op amps......all using Sparko Labs regulators.
VTV Amplifier Custom Input Buffer Hypex NC500 NC1200 NC2K Purifi | VTV Amplifier
They also sell assembled Purifi amps with stock input buffer or with the above buffers. Then you can tweak from there.
VTV AMPLIFIER Stereo Purifi Audio 1ET400A Amplifier | VTV Amplifier
For you adventurous tweakers you can try some of the things I do on my mods to Purifi amps. Since I am a snake oil guy (which, to me, means I listen to things), you will see lots of tweaks some of you will turn your nose up on....that is fine....to each his own. But for those that really like to play and tweak and listen....lots to peruse here:
Purifi amp mods
VTV Amplifier Custom Input Buffer Hypex NC500 NC1200 NC2K Purifi | VTV Amplifier
They also sell assembled Purifi amps with stock input buffer or with the above buffers. Then you can tweak from there.
VTV AMPLIFIER Stereo Purifi Audio 1ET400A Amplifier | VTV Amplifier
For you adventurous tweakers you can try some of the things I do on my mods to Purifi amps. Since I am a snake oil guy (which, to me, means I listen to things), you will see lots of tweaks some of you will turn your nose up on....that is fine....to each his own. But for those that really like to play and tweak and listen....lots to peruse here:
Purifi amp mods
I am checking VTV's options as well.
FWIW, they use the Hypex NC500 input buffers for their Purifi builds, not the EVAL1 Purifi input buffers.
Most of the VTV customers want something more tweaky than an integrated circuit op amp front end. They sell very little of the Hypex input board ones. Their own discrete op amp input board is nice....very similar to the Nord one....in that it has the options for both kinds of discrete op amps and you can even plug in a dual dip integrated circuit op amp. Very versatile.
I haven't really been keeping up with all the activity around these, so forgive me if it's a repeated question. Am I right in thiniing that I could pick up the VTV stereo amp w/ stock Hypex buffer and then retrofit the Neurochrome buffers? It looks like there is room and the power supply connectors are apparently the same. Maybe not the most cost effective, but saves some fabrication.