MASantos

Totally forgot about the transformers… 😅 the meanwells are obviously a great option for all the ease of use they bring to the table.

I don't have the need for one of these as I scored a headamp GSX- mini locally sometime ago, but I don't mind getting a board or two and participate in the effort. Better thermal management, with some large copper areas and holes as in the headmp designs might help a lot. Can we fit an smd GRLV in the same space as the meanwell+regs space?

I guess it would need extra spacing between the bcp and heatsink to acomodate the relays. Looks very nice, if you end up ordering boards for a finalized version, could I bother you with a set? I have a GRLV configured at 24V which could be put to work. I guess one of those mini dissipante cases from modushop should be a nice fit for this.

The dual op445 appears to have the best behaviour indeed. I'll keep following your progress

Thanks! I'll take a look at it. Regarding the smd transistors and input jfets, what was your reasoning for these choices?

Reviving this thread a bit. DIY itch is getting stronger. I would love to try and make a smd cfa3 with digital attenuator and protection circuit on 3 board layout. One board per heatink with the amplification circuit, and a central board with GRLV, input and output attenuator and protection circuit. Sort of what Justin did with his cfa3. Do you have a layout for your smd cfa3, and would you be willing to share it? I have played a bit with schematics editing and board layout, my idea would be to add the individual building blocks to the main board and try to make it fit a nice case such as the mini dissipante from modushop.

How about an onboard psu for the attenuator? shouldn’t add too much real estate.

X-altra MM/MC phono stage. A project published on audioexpress a few years ago and a different design approach compared to my Simplistic phono designed by Salas over at diyaudio.com Will be fun to compare both.

I haven’t read through the tech specs of the amp, but is the volume actually controlled by the alps pot or is it done in the digital domain with the pot only acting as a controller?

Looks great!! Count me interested in a group buy!

Got these b22 and o2 boards over at diyaudio for the price of the input jfets alone. Will have to review them and get the needed parts and case.

Happy Birthday Kevin!

Refurbishing my old Pete Millett hibrid. The electrolitcs are over 15 years old, Should I replace them all or might they still be good? Building a new wood and aluminum case.

Don't forget that a transformer shouldn't work near max output current. Most recommendations for Class A amplifier are to use something with at least double the output current capability.

That's quite a compact build, what is the size of that case? Looks good! What VA is that transformer? It looks quite big.