My Take on X-BOSOZ - Page 11

promitheus · 12th November 2005, 05:46 AM

How much space do the output caps have? abd what is the pin distance for them?

How do you want to heatsink the fets?

steenoe · 12th November 2005, 09:03 AM

Quote:

New improved safer version.

Very nice Russ

If you look at it, there is a "Twisted X" in the middle

Cool.

Quote:

How do you want to heatsink the fets?

All the fets can be mounted on the same heatsink. Like you would do in a poweramp, just in a smaller scale. Thats actually pretty good. All the fets will have the same temp.

Steen.

Nisbeth · 12th November 2005, 09:08 AM

Quote:

Originally posted by steenoe All the fets can be mounted on the same heatsink. <SNIP> All the fets will have the same temp.[/B]

Don't be so sure of that

/U.

steenoe · 12th November 2005, 09:16 AM

Quote:

Don't be so sure of that

I guess you are right Nisbeth. Nonetheless they stand a better chance tracking the temp when mounted on the same sink, instead of having 5 seperate sinks, dont they?

Steen

Nisbeth · 12th November 2005, 09:17 AM

Allright, you win

/U.

awpagan · 12th November 2005, 12:22 PM

just saw the your pcb layout tonight
did this months ago may or maynot be helpful.

based off metalman's schematic
top Ground plane
very close to similar track lenghts (for symmetry) but doesn't look it.

Russ White · 12th November 2005, 12:46 PM

Ok here is the PCB so far..

You could use a vary wide variety of output caps either axial or radial. You could even use something like a high quality axial bipolar electrolytic bypassed with 1-10uf film cap if you chose.

Russ White · 12th November 2005, 01:23 PM

No sure if this is a big improvemnet or not, but I added a ground plane with a single connection to PGND at the GND connector.

Russ White · 12th November 2005, 01:57 PM

Ignore the last PIC it has a problem with the GP

Here is the correct version:

apassgear · 12th November 2005, 05:17 PM

Russ,

I had a closer look to the layout this morning and if you don’t mind I would like to point a couple of small things I would do different:

R12/13 should finish as close as possible to the gates of the FET. I think is doable if you have those resistors in an upright position and moving the red traces a bit downwards.

You have fastons on the input signal and both pins seem to connect to the input. In my opinion one should be ground to properly terminate the ground input to the pcb. I myself will not use the faston connector for the input but of course that’s optional.

I guess that more important that a ground plane is to have a correct star grounding for the input.

I might have some other suggestions but that will take me a while to look over the schematic and layout.

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12th November 2005, 05:46 AM	#101
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	How much space do the output caps have? abd what is the pin distance for them? How do you want to heatsink the fets?

12th November 2005, 09:17 AM	#105
Nisbeth diyAudio Member Join Date: Jan 2001 Location: Denmark	Allright, you win /U.

12th November 2005, 05:17 PM	#110
apassgear diyAudio Member Join Date: Nov 2002 Location: Viña del Mar, Torreon	Russ, I had a closer look to the layout this morning and if you don’t mind I would like to point a couple of small things I would do different: R12/13 should finish as close as possible to the gates of the FET. I think is doable if you have those resistors in an upright position and moving the red traces a bit downwards. You have fastons on the input signal and both pins seem to connect to the input. In my opinion one should be ground to properly terminate the ground input to the pcb. I myself will not use the faston connector for the input but of course that’s optional. I guess that more important that a ground plane is to have a correct star grounding for the input. I might have some other suggestions but that will take me a while to look over the schematic and layout.