Heatsinks for Bosoz?

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#102
Id be interested in 2 board's..
Click to expand...

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.
 
#103
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?
 
#104
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?
Click to expand...

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
 
#107
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
 
#112
Originally posted by Steenoe
Hmm, sorry to ask, what are the advantages of cascoding, compared to the original board?
Click to expand...

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
 
#113
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.
 
#117
Re: Is the Wiki Working?

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
Click to expand...

Strange, it works for me. I've tried with Win XP + IE6 and Linux + Firefox, no problems at all.

/Kari
 
#118
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.
Click to expand...
Hmmm, wish you had said that a bit earlier:xeye: I don't know if it is possible at this point to go with the cascoded version, but I think a lot of us have single ended inputs and would like the best possible Balanced out. It depends, ofcourse, on Kari🙂 If it is not too much trouble, it would be nice with the best possible SE to BAL conversion. I was under the impression that the main thing on that subject, is the CCS.

1) My circuit looses to the cascode about 5V in available output voltage.
Click to expand...
I guess this preamp will still be able to drive a Zen or A-X, as it should be, right?

Thanks a lot for the info, Terry🙂 Now, I will catch a plane for Tunisia, so you guys will have to handle this without me for the next two weeks😀

Steen😎
 
#120
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
 
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