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Joined 2002
Id be interested in 2 board's..
As would I... I want to finalize my chassis design, I've put it off because I intended to use the original bosoz boards I already have but don't want to build around them if I end up getting these. I like to build most things things once. No pressure
Fantastic work Kari.
I just got a replay to my quotation:
Powersupply pcb 50pc's = 12.2USD/pc
Powersupply pcb 100pc's = 7.95USD/pc
Powersupply pcb 150pc's = 6.40USD/pc
XBosoz pcb 50pc's = 11.7USD/pc
XBosoz pcb 100pc's = 7.65USD/pc
XBosoz pcb 150pc's = 6.3USD/pc
+ shipping + paypal fee.
The powersupply size is 200mm x 74mm (7.9" x 2.9") and the xbosoz size is 150mm x 89mm (5.9" x 3.5"). The boards will have red soldermask and the pads will be goldplated.
What do you think?
Powersupply pcb 50pc's = 12.2USD/pc
Powersupply pcb 100pc's = 7.95USD/pc
Powersupply pcb 150pc's = 6.40USD/pc
XBosoz pcb 50pc's = 11.7USD/pc
XBosoz pcb 100pc's = 7.65USD/pc
XBosoz pcb 150pc's = 6.3USD/pc
+ shipping + paypal fee.
The powersupply size is 200mm x 74mm (7.9" x 2.9") and the xbosoz size is 150mm x 89mm (5.9" x 3.5"). The boards will have red soldermask and the pads will be goldplated.
What do you think?
Kari said:I just got a replay to my quotation:
Powersupply pcb 50pc's = 12.2USD/pc
Powersupply pcb 100pc's = 7.95USD/pc
Powersupply pcb 150pc's = 6.40USD/pc
XBosoz pcb 50pc's = 11.7USD/pc
XBosoz pcb 100pc's = 7.65USD/pc
XBosoz pcb 150pc's = 6.3USD/pc
+ shipping + paypal fee.
The powersupply size is 200mm x 74mm (7.9" x 2.9") and the xbosoz size is 150mm x 89mm (5.9" x 3.5"). The boards will have red soldermask and the pads will be goldplated.
What do you think?
Sounds reasonable to me, will one PSU power two XBOSOZ boards, or does each XBOSOZ require it's own power supply?
I am in for 2 of each myself, 4 of each if we break 100 pcs.
Regards
Anthony
Hi There Kari
I would be interested in enough boards for a standard bosoz setup. If a seperate psu can be used for each amp board I would go for that so 2 of each boards. Price seems good at any rate for me.
I guess a wiki for a group buy would be the logical next step. I havent done that sorta thing before but Im sure someone out there has....
dave
I would be interested in enough boards for a standard bosoz setup. If a seperate psu can be used for each amp board I would go for that so 2 of each boards. Price seems good at any rate for me.
I guess a wiki for a group buy would be the logical next step. I havent done that sorta thing before but Im sure someone out there has....
dave
Heat sink!!
Go and take a look at this guy's bosoz heatsink!
http://www.cowanrg.mesanetworks.net/projects/bosoz.htm
Awsome Alsph chasis too and for sale.
http://www.cowanrg.mesanetworks.net/projects/
Go and take a look at this guy's bosoz heatsink!
http://www.cowanrg.mesanetworks.net/projects/bosoz.htm
Awsome Alsph chasis too and for sale.
http://www.cowanrg.mesanetworks.net/projects/
One will be enough for 2 channels, of course if you want to you can use one for each channel.Coulomb said:
Sounds reasonable to me, will one PSU power two XBOSOZ boards, or does each XBOSOZ require it's own power supply?
/Kari
GP up @ http://www.diyaudio.com/wiki/index.php?page=X-Bosoz+and+power+supply+GP
I'm in the process of creating a web based ordering page. This is really needed so i don't repeat the mistakes which i had with the AX GP.
Still it is important that you list yourself on the wiki page so we can get the correct pricing.
Thank you,
Kari
I'm in the process of creating a web based ordering page. This is really needed so i don't repeat the mistakes which i had with the AX GP.
Still it is important that you list yourself on the wiki page so we can get the correct pricing.
Thank you,
Kari
Originally posted by Steenoe
Hmm, sorry to ask, what are the advantages of cascoding, compared to the original board?
The advantage are twofold:
1) Lower transistor generated distortion from eliminating the influence of voltage variations across the gain Fet's (less for Susy to correct).
2) Wider bandwidth. My version is linear beyond 100kHz, with no significant phase shift up to ~30kHz.
These two factors create a significant advantage when being the circuit is being used as a Bal to SE or SE to Bal converter, or if being used fully SE, where the effect of the Susy is not as great. In Bal in to Bal out mode, the effect of the cascode is pretty subtle.
The disadvantages:
1) My circuit looses to the cascode about 5V in available output voltage.
2) Higher parts count/less simple circuit.
I haven't been paying attention to this thread for a bit, and now I wish I had kept up. I'll give Kari's cascoded circuit a lookover. I may have some useful suggestions.
Cheers, Terry
power supply
The boards look great, my question is whether the PS can handle the additional load, I think the X-ccs uses almost twice as much power right? I'm wondering what What AC and DC voltages are being used in the power supply as well.
I took a quick look all all the pages here and it seemed to be original (+/- 60) DC but I may have missed something.
The boards look great, my question is whether the PS can handle the additional load, I think the X-ccs uses almost twice as much power right? I'm wondering what What AC and DC voltages are being used in the power supply as well.
I took a quick look all all the pages here and it seemed to be original (+/- 60) DC but I may have missed something.
Re: power supply
+60/-9V is needed. The current draw is around 40ma trough each fet and 80ma trough the ccs fet. 60*0.04 =~2,4W for each fet and 9*0,08 =~0,8W for the ccs fet.
lgreen said:I took a quick look all all the pages here and it seemed to be original (+/- 60) DC but I may have missed something.
+60/-9V is needed. The current draw is around 40ma trough each fet and 80ma trough the ccs fet. 60*0.04 =~2,4W for each fet and 9*0,08 =~0,8W for the ccs fet.
Illusus said:When is the cutoff date?.
Let's wait a couple of weeks, let's say 8:th of May. OK?
/Kari
Re: Is the Wiki Working?
Strange, it works for me. I've tried with Win XP + IE6 and Linux + Firefox, no problems at all.
/Kari
GeorgeBoles said:Hello everybody,
I have tried to get to the Wiki via the link above, and via the diyaudio header, but no luck both yesterday and today. Is it working at present? I have not had any problems before.
Regards,
George
Strange, it works for me. I've tried with Win XP + IE6 and Linux + Firefox, no problems at all.
/Kari
Hmmm, wish you had said that a bit earlierThese two factors create a significant advantage when being the circuit is being used as a Bal to SE or SE to Bal converter, or if being used fully SE, where the effect of the Susy is not as great. In Bal in to Bal out mode, the effect of the cascode is pretty subtle.
![xeye :xeye: :xeye:](https://files.diyaudio.com/forums/images/smilies/xeye.gif)
I guess this preamp will still be able to drive a Zen or A-X, as it should be, right?1) My circuit looses to the cascode about 5V in available output voltage.
Thanks a lot for the info, Terry
Steen
Re: Is the Wiki Working?
Works fine for me as well. Are you still having problems?
GeorgeBoles said:I have tried to get to the Wiki via the link above, and via the diyaudio header, but no luck both yesterday and today.
Works fine for me as well. Are you still having problems?
Adding the second pair of fets to the design is pretty easy. Still people that want to run without the cascoded fet pair can do so by leaving out 2 resistors, 2 zeners and of course the fets. In addition to that a jumper is required also. The bad news is that the pcb will probably get bigger and thus do something to the pricing, altho i expect this to be cents instead of dollars.
What about the 10V reference zener then? Zeners are noisy, maybe a cap in paralell with the zener would improve that?
Metalman, did you use the zener or did you implement some other means of voltage reference?
/Kari
What about the 10V reference zener then? Zeners are noisy, maybe a cap in paralell with the zener would improve that?
Metalman, did you use the zener or did you implement some other means of voltage reference?
/Kari
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