SCHEMATICS for v372D needed PLEASE

[[silent:arts]]

component numbers

 

[sonolink]

Oh I see!! Of course....
Thanks

I'm retiring the old electrolytics. A weird thing is that I count 13 lytics per channel on the schem but I find only 5 per channel on the boards. I guess I'll stick with the boards...

 

[ingaudio]

Hello from Leghorn-- Italy
I'm new in GroupDIY... but old for audio (My repair lab is on from  '80 !!)
I often  upgrading  prof and hi-fi equipment (almost 30% of my jobs)
In this case I'd put Elna Silmic II in signal path and Elna RE2J 105° for the other  electrolytics
Try ....  the transparency and neutrality ....fly

 

[[silent:arts]]

I'm retiring the old electrolytics. A weird thing is that I count 13 lytics per channel on the schem but I find only 5 per channel on the boards. I guess I'll stick with the boards...

We see many Tantalums on your boards.
My guess is the 200µF (17, 18, 23) and the 500µF (22, 24) are electrolytics, and all others are tantal.

 

[sonolink]

Oh I see. Is that good or bad (substituting electrolytics with tantalums)?

One of the units has already been recapped but I'll change them anyway to keep things even.

I've also noticed that some transistors have been replaced by modern ones. If the unit sounds nice is it worth looking for NOS transistors?

Cheers
Sono

 

[sonolink]

Would these caps be ok?

https://www.banzaimusic.com/220uF-40V-axial.html
https://www.banzaimusic.com/470uF-40V-axial.html
https://www.banzaimusic.com/470uF-25V-axial.html

Cheers
Sono

 

[sonolink]

Any suggestions for a PSU? Would Rochey's Uber be ok (it's bipolar though)? Maybe I could use it with a 24-0-24 to get 24 and 48 for.phantom? Or that's not a good idea?

Cheers
Sono

 

[sonolink]

Nobody?  :'(

 

[DerEber]

No Idea what PSU you are talking about. But 2x 24= 48  ;D
Just be aware of you'd likely want to ground the -24V then and treat it like 0V

 

[sonolink]

I was referring to the Uber PSU by Expat Audio.

http://expataudio.myshopify.com/products/uber-power-supply

http://www.expataudio.com/diy/uberpsu/Expat%20Audio%20Uber-Power%20Supply.pdf

 

[DerEber]

Looks doable.
It's just so few components I personaly would do it without a PCB.
The PCB is ready for 48 V.
C1 and C2 looks interesting. I have never seen it like this, but seems to work.

 

[synthiaks]

C1 and C2 are part of the 48V charge pump, i guess.

Don't forget the 6.81K resistors for the Phantom power to limit the current. I think Jensen have a good PDF on how to wire this correctly.

 

[[silent:arts]]

Of course I would use my POS48PSU together with my OMSS48 PCBs, or the FP48PSU together with MIO PCBs.
Available in the White Market. 

 

[sonolink]

I was asking about Rochey's PSU because I have a spare one
With a transformer and proper regulators I guess I'd be sorted.

No one answered my other question about if those condensers were ok. Could someone please confirm?

Thanks a lot
Cheers
Sono

 

[moamps]

They are ok.

 

[moamps]

Of course I would use my POS48PSU together with my OMSS48 PCBs, or the FP48PSU together with MIO PCBs.
Available in the White Market. 

DI is missing...

 

[sonolink]

Thanks for the answer Moamps!!

DI would be great but I want to hear the pres before

 

[sonolink]

Of course I would use my POS48PSU together with my OMSS48 PCBs, or the FP48PSU together with MIO PCBs.
Available in the White Market. 

Volker,
What are the differences between them? Do both have slow start 48v, pad and phase? Do you have a BOM or an aprox cost to populate them? What xmfr would I need?

Cheers
Sono

 

[[silent:arts]]

The OMSS48 PCB is the same slow start 48v lie the MIO but without pad and phase.
The FP48PSU is a POS48PSU with a separated regulator for relays etc.
A transformer with a single 24V secondary is fine for both PSUs.
I don't have an explicit BOM since you can see all parts in the schematic / PCB overlay.

 

[sonolink]

There are no power ratings on any of the schems, neither for diodes, caps, resistors, etc. I guess they'll depend on the transformer? Any guidelines to calculate cost?

"Pos" is positive, right? What about "Fix"? Is that the feed for relays?
What would you use relays for?

Thanks