Heatsinks for Bosoz?

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#382
The Parts Kit GB for Kari's X-BOSOZ is now closed. Please ensure you are paid by the 15th of June or your order will be cancelled.

Many thanks to all those who participated early on this offering, IMHO you are getting a fantastic value for the money. I am sure everyone will be more than satisfied with the parts selection for the kits.

DIYCLUB Biz has confirmed delivery of the transformers from the factory to them is 3 weeks. Surface shiping to me will be about 6 weeks. For those of you who just bought the Preamp Kits, you can expect delivery in 4 to 6 weeks from today. I will gladly ship partials to those who want them, but you will pay for shipping twice, including two sets of packaging.

Local Pick ups and a cup of tea are always welcome.

Regards

Anthony
 
#384
fcel said:
Anthony,
What is your plan on volume control? And input selector (manual or electronic)? We want something nice, right?
Click to expand...

Well I ordered myself a full balanced Remote enabled, processor controlled Relay fitted with Holco resistors unit for $210US from DIYClub Biz.

Here is the unit:

http://eshop.diyclub.biz/product_info.php?cPath=85_186&products_id=218

V-03 (Holco) balance US$210.00

Remote volume control board, full balance design (four pieces of volume control board) using relay switching two sets of resistors (R-2R network).
1dB per step, attenuate from 0 db to -80dB, output. Holco resistor, with four channel relay input select and CPU control display,
dual mono design, left and right channel can be fine adjustment.

Each set consist four pieces of resistor volume relay and input relay board
one piece of display board
two pieces of power regulator board
one remote handset
 
#385
Coulomb said:


Well I ordered myself a full balanced Remote enabled, processor controlled Relay fitted with Holco resistors unit for $210US from DIYClub Biz.

Here is the unit:

http://eshop.diyclub.biz/product_info.php?cPath=85_186&products_id=218

V-03 (Holco) balance US$210.00

Remote volume control board, full balance design (four pieces of volume control board) using relay switching two sets of resistors (R-2R network).
1dB per step, attenuate from 0 db to -80dB, output. Holco resistor, with four channel relay input select and CPU control display,
dual mono design, left and right channel can be fine adjustment.

Each set consist four pieces of resistor volume relay and input relay board
one piece of display board
two pieces of power regulator board
one remote handset
Click to expand...

I 2 was thinking about buying one of these. : O )
 
#387
V-03 looks like something that Harvadian manuf. for a while back a couple years ago and which you have built. How did it work it - the Harvadian one? In your opinion, which one is less complicated to built and have a greater chance of success - V-03 or Harvadian?
 
#388
fcel said:
V-03 looks like something that Harvadian manuf. for a while back a couple years ago and which you have built. How did it work it - the Harvadian one? In your opinion, which one is less complicated to built and have a greater chance of success - V-03 or Harvadian?
Click to expand...

The APOX works very well, a little quirky, the programming could have been cleaned up a bit. I had to build it myself as opposed to the V03 is a complete product.

Also Apox was $350US complete I believe and no longer available. Kind of makes the choice a little self evident.

Regards

Anthony
 
#392
more confusion

Ok, I don't know whats going on here but everyone is contradicting each other.

For example, Post #92 shows heatsinks for 5 MOSFETs. here.

Yet post #390 shows a link to post #34 that shows a schematic that has only 3 MOSFETs that I can see.
Here.

Moreover, Post #114 says that the PS is +60 and -9 V. Yet Columb in Post #374 implies that the pos. secondary is still 60V which would be an 80V supply. Then post #380 says -9 and +60 again.

I guess I can accept that the supplies are now confirmed at +60 and -9, but what about the MOSFETs? The schematic from #34 does not appear to match the board layout in #92.

Basically we have a free-for-all where people are trying to order parts and no well defined schematic or layout.
 
#393
Re: more confusion

lgreen said:
Ok, I don't know whats going on here but everyone is contradicting each other.

For example, Post #92 shows heatsinks for 5 MOSFETs. here.

Yet post #390 shows a link to post #34 that shows a schematic that has only 3 MOSFETs that I can see.
Here.

Moreover, Post #114 says that the PS is +60 and -9 V. Yet Columb in Post #374 implies that the pos. secondary is still 60V which would be an 80V supply. Then post #380 says -9 and +60 again.

I guess I can accept that the supplies are now confirmed at +60 and -9, but what about the MOSFETs? The schematic from #34 does not appear to match the board layout in #92.

Basically we have a free-for-all where people are trying to order parts and no well defined schematic or layout.
Click to expand...

Well I ordered the GB parts from Kari's BOM that he posted and I spent a good deal of time clarifing Form, Fit and Function with him.

As for as the POST regulator rails, they have always been -9/+60, the AC Primary has always been 60VAC and 12 to 18VAC. I am not sure why anyone would be confused about this.

Reagrds

Anthony
 
#395
illusionxx said:
igreen,

2 of the TO220 packages are voltage references.

But i would also like to see a schematic for the actual version of the preamp including the voltage references and the difference between the cascoded and uncascoded setup.

illusionxx
Click to expand...


The voltage references are to-92 packages and do-35(ish) packages. The "extra" pair of TO-220 devices are the cascode mosfets.

I believe the final version of the board was around post 134 - http://www.diyaudio.com/forums/attachment.php?s=&postid=638685&stamp=1115671858 It is a simple circuit, and you can almost see the schematic looking at the board, it is easy to trace out. The top FET and parts around it is the current source, the bottom pair the gain devices and the upper pair are the cascodes. Keep a copy of the original BOSOZ handy to help understand it. Kari's BOM states what you delete to eliminate the cascode.
 
#396
I agree with a comment above. Could someone please post the "final" version of the schematic as committed on the GB board w/parts from that GB as well? High lighting the cascoded and non-cascoded option would be great!

It would really help settle some confusion, it's better than having everyone reverse engineer the schematic from the GB boards they ordered.

The lastest available schematic does not match the GB boards.

Kari we might need your help here.

Thanks,

-David
 

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#397
igreen,

2 of the TO220 packages are voltage references.
Click to expand...
The voltage references are to-92 packages and do-35(ish) packages. The "extra" pair of TO-220 devices are the cascode mosfets.
Click to expand...

Huh??? I see the board has labels Q1-Q5, looking like MOSFETs in TO-220 packages that are heatsunk, and REF1 and REF2 looking like voltage references that are not heatsunk. I see a schematic that lacks labels corresponding to the layout and lacks voltage references of any kind, and has only 3 MOSFETs.

I don't mean to be a pain I'm sure somthing accurate will be coming at some point, or I'll just have to get the boards and reverse engineer the schematic.
 
#398
Hello, for the members of the parts group buy, I am undecided about the rectifier diodes. Should I go with an MUR415 Axial or an MUR815 TO-220?

As kari's PSU board does not provide for heatsinks for the rectifier diodes, (not really required), an axial device would suffice. The two diodes are identical Ultra Fast type devices. The Axial is 4 Amp rated and the the TO-220 8 Amp rated. In this application there would be no performance difference between the two devices. The difference is in the pricing, I could use the savings to boost component performance elsewhere.

I myself will be using FRED's a much more expensive Rectifier than the MUR type device, as much as $3 per device in place of $0.70 per device. FRED's are only available in a TO-220 package.

Here is a link for the MUR415.

http://rocky.digikey.com/WebLib/On-Semi/Web Data/MUR405,10,15,20,40,60.pdf

Here is a link for the MUR815

http://rocky.digikey.com/WebLib/On-Semi/Web Data/MUR805,10,15,20,40,60.pdf

Here is a link for the FRED I am referring to, for those interested.

http://www.irf.com/product-info/datasheets/data/hfa08tb60.pdf

Regards

Anthony
 
#400
I would agree with Brian. The power supply on the preamp is not the most critical. Yet it is certianly worth consideration. I think it would be nice to lay out where corners were cut for costs and how they could be improved, for those who would choose to.

I myself would probably just cough up the extra money for the FREDS now, but this being a group buy, I realise that I am probably in the minority.

Dave
 
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