Hello PEARL 3-builders,
I made a few steps forward today. Most of the two PEARL 3 - channels in their seperated cases.
Looking for some good contact between the panels - shielding.
Checked all contacts from RCA-sockets, through the RC-selector to the pcb. As well all contacts
from the pcb to the outputs.
DC - wires also in good contact. No cold solder joints please! I don't want to disassemble anything.
The story of the PEARL 3 - project continues...
Still thinking about my PSU arrangement. All in one - case or crazy dual mono?
I wish you all a lot of fun with your cases from MODUSHOP / Gianluca. Great stuff!
Hopefully you will get your boards soon. I think, it will be a nice christmas present.
Cheers
Dirk
I made a few steps forward today. Most of the two PEARL 3 - channels in their seperated cases.
Looking for some good contact between the panels - shielding.
Checked all contacts from RCA-sockets, through the RC-selector to the pcb. As well all contacts
from the pcb to the outputs.
DC - wires also in good contact. No cold solder joints please! I don't want to disassemble anything.
The story of the PEARL 3 - project continues...
Still thinking about my PSU arrangement. All in one - case or crazy dual mono?
I wish you all a lot of fun with your cases from MODUSHOP / Gianluca. Great stuff!
Hopefully you will get your boards soon. I think, it will be a nice christmas present.
Cheers
Dirk
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Ordered. Thank you for following up!That should be fixed now
To clarify, if you want the Modushop chassis set, buy directly from Modushop.
https://modushop.biz/site/index.php?route=product/product&product_id=971
It may be a store item in the future, but for now (Late 2023-Early 2024) Buy from @Gianluca
There is a group buy for PSU parts here - https://www.diyaudio.com/community/threads/gb-pearl-3-phono-crcrc-power-supply-parts-kit.406461/
Pearl 3 pioneer kits have been received by the fulfillment company, and hopefully will be ready for sale in the diyAudio Store this week. Watch the thread, there will be an announcement.
@cubicincher That looks wonderful! Nicely done!
https://modushop.biz/site/index.php?route=product/product&product_id=971
It may be a store item in the future, but for now (Late 2023-Early 2024) Buy from @Gianluca
There is a group buy for PSU parts here - https://www.diyaudio.com/community/threads/gb-pearl-3-phono-crcrc-power-supply-parts-kit.406461/
Pearl 3 pioneer kits have been received by the fulfillment company, and hopefully will be ready for sale in the diyAudio Store this week. Watch the thread, there will be an announcement.
@cubicincher That looks wonderful! Nicely done!
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@cubicincher
Go crazy. Dual mono.
You could put two PSUs in one case with one AC connection (and signal ground converging on the bridge isolator) but two outputs, one for each channel.
Permutations...
Go crazy. Dual mono.
You could put two PSUs in one case with one AC connection (and signal ground converging on the bridge isolator) but two outputs, one for each channel.
Permutations...
@cubicincher
We're on the same page.
Do you have a schematic for your PSUs? Voltage in Voltage out...
We're on the same page.
Do you have a schematic for your PSUs? Voltage in Voltage out...
I wonder if some building the UDP3 to be used with kit P3 boards (which have onboard regulators) will build is a dual mono (using 2 x UDP3). Personally I see no advantage doing this as the UDP3 is very "over-dimensioned". And with onboard regulators the change that a signal in one channel can "shoot back" into the other channel is "non-existent" <-- my own conclusion without any evidence. But I would like to see someone that can measure it and show it to me.
Using "only" one UDP3 will ensure both channels regulators get the exact same input (100% symmetry). If I built another UDP3 there would be a slight difference in voltage between. E.g. like 19.3V / 19.5V ? .....and this is measurable
Also when looking at poor channel separation from the cartridge?
What expected benefit other than it can be done and probably fun to do?
Using "only" one UDP3 will ensure both channels regulators get the exact same input (100% symmetry). If I built another UDP3 there would be a slight difference in voltage between. E.g. like 19.3V / 19.5V ? .....and this is measurable
Also when looking at poor channel separation from the cartridge?
What expected benefit other than it can be done and probably fun to do?
I stay with one transformer + UDP3.
Just got the 20VA 2 x 22 VAC Toroidy transformer today.
Normally I get large and heavy stuff from Toroidy. But this one I "dig" into the box and a very tiny disappointing little "thing" showed up.
They call it a transformer. OK.....with both magnetic and static screens not much noise will emit from this tiny "thing" I assume. That is at least an advantage. Maybe I can even stack the two P3 chassis without any hum / noise issues. Also it is low profile so can fit into the PSU chassis from Gianluca.
Just got the 20VA 2 x 22 VAC Toroidy transformer today.
Normally I get large and heavy stuff from Toroidy. But this one I "dig" into the box and a very tiny disappointing little "thing" showed up.
They call it a transformer. OK.....with both magnetic and static screens not much noise will emit from this tiny "thing" I assume. That is at least an advantage. Maybe I can even stack the two P3 chassis without any hum / noise issues. Also it is low profile so can fit into the PSU chassis from Gianluca.
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Regarding symmetry I tried to bend the legs on the standing protection diodes the exact same way to have perfect symmetry. I did not quite succeed. Think the left diode in the picture looks a little bit better than the other. I considered to redo it but then I thought......no human is 100% perfect so I "let it be" as is.
But I like symmetry.
But I like symmetry.
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@mhenschel
I had a computercrash and a lot of my data - also KiCAD-data - got lost.
But it is very close to this in the PEARL 2 - thread / post #1
https://www.diyaudio.com/community/threads/building-a-pearl-2.204336/
Cheers
Dirk
I had a computercrash and a lot of my data - also KiCAD-data - got lost.
But it is very close to this in the PEARL 2 - thread / post #1
https://www.diyaudio.com/community/threads/building-a-pearl-2.204336/
Cheers
Dirk