BOSOZ help needed

lgreen · 9th December 2005, 06:46 PM

I've managed to get a pair of Kari's X-CCS-BOSOZ boards and put them together.

Problem is that the L/R channels don't use any power, after turing the thing on, and off, the power does not drop, and there is no output. Overnight the + rail went from +60 to +54 for example.

Link to schematic.

Link to image of my board

Perhaps I oriented something incorrectly?? the + and - DC inputs? The MOSFETS? The voltage references?

I don't think that there were any errors on Kari's L/R preamp boards (unlike the 2 on the power supply) but I could be wrong.

edit- the power supplies are working, +60V and -8V DC. The 22.1 ohm resistors are under the board so you don't see them. I have no grounds connected to the inputs and outputs, yet (no signals going in or out at this point) figured that the DC power supply ground would be sufficient to get it up and running, and that one is connected.

anyone?

steenoe · 9th December 2005, 07:03 PM

Quote:

Link to image of my board

Pretty sight

Do check your wiring again! As far as I know, the boards are supposed to work. Did you swap in/out wires with the ground wires or something like that? I just happened to do that on one channel of a preamp

Take a really close look at all your wiring. I just built the Twisted BosoZ, which is based on Kari's schematic, and it works (wonders!) Good luck

Steen

lgreen · 9th December 2005, 07:09 PM

Quote:

Originally posted by steenoe
Pretty sight Do check your wiring again! As far as I know, the boards are supposed to work. Did you swap in/out wires with the ground wires or something like that? I just happened to do that on one channel of a preamp Take a really close look at all your wiring. I just built the Twisted BosoZ, which is based on Kari's schematic, and it works (wonders!) Good luck

Steen

Yeah, I checked the wiring. Hmm.....is the silkscreen ok on those boards? anything shown backwards?

I'll take some DC measurements and post results if this can't be solved asap.

steenoe · 9th December 2005, 07:19 PM

Quote:

Hmm.....is the silkscreen ok on those boards? anything shown backwards?

Come to think of it, not many people reported about finishing Kari's BosoZ! Maybe there could be a mistake somewhere, as there is on the PSU board? I guess you catched the one on the PSU??

Steen.

hifimaker · 9th December 2005, 07:30 PM

Search Kari's board thread. There was an error with the diodes in the PS.

-David

steenoe · 9th December 2005, 07:46 PM

Quote:

There was an error with the diodes in the PS.

Yep, I quote: Important! The diodes on the positive side has a silkscreen error! Just turn the diodes 180degrees and you should be fine.
Also D9 and D10 are connected wrong. Please connect them as the picture here:
I just took a pic of the pic from Kari's homepage

Hope you can see it

Luckily enough, I did print it out, when the homepage was still running

Here you go

Hope this is the answer!

Steen

Sorry if this is the problem, I took it for granted, that you knew about it!

lgreen · 9th December 2005, 07:54 PM

Quote:

Originally posted by lgreen
***
I don't think that there were any errors on Kari's L/R preamp boards (unlike the 2 on the power supply) but I could be wrong.

edit- the power supplies are working, +60V and -8V DC. The 22.1 ohm resistors are under the board so you don't see them. I have no grounds connected to the inputs and outputs, yet (no signals going in or out at this point) figured that the DC power supply ground would be sufficient to get it up and running, and that one is connected.

anyone?

I wish!!!! actually I caught the errors in the power supplies and fixed them as per everyone's posts. So its not that....

steenoe · 9th December 2005, 08:10 PM

Quote:

So its not that....

Darn

Well, I have a pair of Kari's boards too

I will try to see if I can solder them up, next week and find the faults, if there are any! At this point I cant offer you better than that

I recommend that you check the wiring again, though

Could someone please give a link to a working preamp of Kari's?? Please come forward if you know of one!

Steen

lgreen · 9th December 2005, 08:41 PM

The only other attempt at Kari's boards that I know if is by dhole
here.

I just replied, wonder if he got them working.

AR2 · 10th December 2005, 05:26 AM

Maybe the fact that Colombo is not delivering parts from the group buy is not as bad. Otherwise we all will be pulling our hairs.
Sorry Lgreen

I still hope for the parts so I could join you in finding the problem. This whole thing was a problem - long wait for the boards, mistake on boards, no parts... Unfortunate. And I have 6 boards!!!

9th December 2005, 06:46 PM	#1
lgreen diyAudio Member Join Date: May 2003 Location: San Diego, USA	BOSOZ help needed I've managed to get a pair of Kari's X-CCS-BOSOZ boards and put them together. Problem is that the L/R channels don't use any power, after turing the thing on, and off, the power does not drop, and there is no output. Overnight the + rail went from +60 to +54 for example. Link to schematic. Link to image of my board Perhaps I oriented something incorrectly?? the + and - DC inputs? The MOSFETS? The voltage references? I don't think that there were any errors on Kari's L/R preamp boards (unlike the 2 on the power supply) but I could be wrong. edit- the power supplies are working, +60V and -8V DC. The 22.1 ohm resistors are under the board so you don't see them. I have no grounds connected to the inputs and outputs, yet (no signals going in or out at this point) figured that the DC power supply ground would be sufficient to get it up and running, and that one is connected. anyone?

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9th December 2005, 07:30 PM	#5
hifimaker diyAudio Member Join Date: Oct 2003 Location: San Jose	Search Kari's board thread. There was an error with the diodes in the PS. -David

9th December 2005, 08:41 PM	#9
lgreen diyAudio Member Join Date: May 2003 Location: San Diego, USA	The only other attempt at Kari's boards that I know if is by dhole here. I just replied, wonder if he got them working.

10th December 2005, 05:26 AM	#10
AR2 Master Burner Join Date: Dec 2002 Location: San Francisco, California	Maybe the fact that Colombo is not delivering parts from the group buy is not as bad. Otherwise we all will be pulling our hairs. Sorry Lgreen I still hope for the parts so I could join you in finding the problem. This whole thing was a problem - long wait for the boards, mistake on boards, no parts... Unfortunate. And I have 6 boards!!!

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