Istvan - I was going to offer you Gerbers for my P2 boards, which is basically the P3 with different transformer pads. The P2 has connections for off-board transformer + the 60x60mm transformer.
But it looks like you got the job done in a traditional "old school" way - nice work!!!
But it looks like you got the job done in a traditional "old school" way - nice work!!!
Very nice, good job on your own boards too.
Have never done that, very DIY indeed.
Hi Dirk...... Interresting with the two opamp solution, since they do different jobs.
I guess this can be accomplished also with a Brown Dog adaptor (2 single SOIC to DIP-8).
I´m interrested to know, which opamps you´ve tried/ended up with?
And..... if it worked out better..... would you have any leftover boards??
As many of us are waiting for kits to show up again at the store could you make your gerbers available?
If that is ok for Wayne and diyaudiostore of course!
Hello Lvandoorn,
I do not really want to make my gerbers availabkle for the public. Why? Because I don't want to offend the efforts of
Wayne Colburn as well the efforts of the DIYaudio - store.
Sorry that I am holding back. Patience please, I am pretty sure the PEARL 3 - kits will be back soon.
I am asking for understanding.
Cheers
Dirk
I do not really want to make my gerbers availabkle for the public. Why? Because I don't want to offend the efforts of
Wayne Colburn as well the efforts of the DIYaudio - store.
Sorry that I am holding back. Patience please, I am pretty sure the PEARL 3 - kits will be back soon.
I am asking for understanding.
Cheers
Dirk
Some progress - getting closer and closer 😀
First off, I don't want to spoil a party...
Your build looks gorgeous, so much effort and care went into it!
I understand the Toroidy are twice shielded and all compartments are well separated to avoid emissions.
BUT I can't help thinking that having the big PS so close (instead of as far away as possible, the design lends to it) isn't a good thing.
Of course, I hope I am wrong (my own - different - RIAA pre is VERY senstive to emissions if not boxed properly, hence me being suspicious).
And of course it appears the Pearl 3 seems to work on the bench without any noise even if not boxed (!), so fingers X
As said, beautifull work, the rest is your beer ;-)
Claude
Your build looks gorgeous, so much effort and care went into it!
I understand the Toroidy are twice shielded and all compartments are well separated to avoid emissions.
BUT I can't help thinking that having the big PS so close (instead of as far away as possible, the design lends to it) isn't a good thing.
Of course, I hope I am wrong (my own - different - RIAA pre is VERY senstive to emissions if not boxed properly, hence me being suspicious).
And of course it appears the Pearl 3 seems to work on the bench without any noise even if not boxed (!), so fingers X
As said, beautifull work, the rest is your beer ;-)
Claude
Thanks Claude!
Yes, the (this, my) Pearl 3 works on the bench without chassis, with the (normal) donuts very close to the PCBs without any issue.
The Toroidy are small donuts (only 20VA) in a really big housing so I really hope there will be no hum. In fact I'm almost sure.
And if there is hum - the PSU will get a separated chassis.
It's diy, and we are crazy in different ways 😀
Yes, the (this, my) Pearl 3 works on the bench without chassis, with the (normal) donuts very close to the PCBs without any issue.
The Toroidy are small donuts (only 20VA) in a really big housing so I really hope there will be no hum. In fact I'm almost sure.
And if there is hum - the PSU will get a separated chassis.
It's diy, and we are crazy in different ways 😀
I am going to join you in spoiling!
@Plott
I would use single trafo and make the config mirror image and not c2 symmetric as you have it now. If the goal is to make the best of the best riaa and you have the time and inclination, I would spend the money matching input jfets, upgrading the opamp to burson v7v and sub the kit j112 with low noise j112, a small but worthy mod.
I would say each brings a degree of improvement, the biggest being the Burson.
This riaa is in my system to stay, when used at full gain with MC pickups.
Very nice. I would suggest increasing the distance between rectifier diodes (generating switching noise) and the sensitive input LSK170s. This can be done with minimal effort by flipping the left PS PCB upside down, and the right Pearl 3 PCB upside down. Leave the other two PCBs as they are. This would double the critical rectifier-LSK170s distance. In any case, this can be tried at no cost. Good luck.