The Aleph-X - Page 49

carpenter · 29th August 2002, 04:32 AM

Why not just mask the ground plane with a thick insulating layer such as polyurethane or something similar?

John Inlow

skaara · 29th August 2002, 09:01 AM

Are these the pcbs for grollins amp?

carpenter · 29th August 2002, 02:15 PM

Yes, these pcbs were designed from Grollins schematics by "tvi" and enhanced by me (carpenter). I added the Aleph off-board multi-transistor approach as well as flipping around a few components.

Please proof read before using. I'm careful, but human. I have etched myself a pcb and now have the components. After I finish my wife's home office, I'm going to put the pieces together. Until then, I have no physical proof to whether or not these circuits are layed out properly.

John Inlow

vdi_nenna · 29th August 2002, 02:51 PM

Sorry John, where did you say we can get a copy of your PCB?

Thank Vince

BTW- I built your heatsinks last year and they look great. I haven't had the chance to put them to work yet...maybe on the XA!

Thanks!

carpenter · 29th August 2002, 03:09 PM

Hi Vince,

I made the pcb myself. I attached a copy of the pcb art to a raw circuit board and pressed indentations where the pads go with a sharp pointed tool. I then added the dry transfers. I began with the pads and then layed on the circuit traces. After that came the etching. Very simple proceedure.

Thanks for the compliment regarding my chassis proceedure.

John Inlow

stefanobilliani · 29th August 2002, 04:00 PM

John,

Just to know that I have understand well , the sense terminal is were I put the source of each mosfet.

And if can be of help: the drain of Q10 is signed two times ; one of these is the drain of Q11.

Thanks very much.

vinay · 29th August 2002, 04:18 PM

John,

When I open the pcb layout in photoshop, at 100% the image size is 8inch by 12inch. What is the actual dimensions of the PCB.

Thanks,

Vinay

carpenter · 29th August 2002, 10:17 PM

The actual pcb size is 4"x6". I enlarged the drawings for clarity. I go to a photo shop to have my layout transferred to film. They do a 1/2 reduction and because of the process the detail is fantastic.

John Inlow

carpenter · 29th August 2002, 10:32 PM

This is why I'm so glad you folks are proof reading. I have made the correction to my drawings. Q10 drain (located next to R44/45 on the right hand side of the stuffing drawing) is incorrectly labeled and should be tagged Q11drain.

John Inlow

carpenter · 29th August 2002, 10:40 PM

I enhanced Grey's schematics to my liking. I added the Aleph off board concept in blue boxes. Does anyone see any flaws?

Thanks,

John Inlow

29th August 2002, 04:32 AM	#481
carpenter Paper mache horn fabricator diyAudio Member Join Date: Mar 2002 Location: Oregon City, Oregon	safer ground plane Why not just mask the ground plane with a thick insulating layer such as polyurethane or something similar? John Inlow

29th August 2002, 03:09 PM	#485
carpenter Paper mache horn fabricator diyAudio Member Join Date: Mar 2002 Location: Oregon City, Oregon	pcb availability Hi Vince, I made the pcb myself. I attached a copy of the pcb art to a raw circuit board and pressed indentations where the pads go with a sharp pointed tool. I then added the dry transfers. I began with the pads and then layed on the circuit traces. After that came the etching. Very simple proceedure. Thanks for the compliment regarding my chassis proceedure. John Inlow

29th August 2002, 04:18 PM	#487
vinay diyAudio Member Join Date: Mar 2001 Location: Seattle	Scale for the PCB layout John, When I open the pcb layout in photoshop, at 100% the image size is 8inch by 12inch. What is the actual dimensions of the PCB. Thanks, Vinay

29th August 2002, 10:17 PM	#488
carpenter Paper mache horn fabricator diyAudio Member Join Date: Mar 2002 Location: Oregon City, Oregon	pcb size The actual pcb size is 4"x6". I enlarged the drawings for clarity. I go to a photo shop to have my layout transferred to film. They do a 1/2 reduction and because of the process the detail is fantastic. John Inlow

29th August 2002, 10:32 PM	#489
carpenter Paper mache horn fabricator diyAudio Member Join Date: Mar 2002 Location: Oregon City, Oregon	nice catch stefanobilliani This is why I'm so glad you folks are proof reading. I have made the correction to my drawings. Q10 drain (located next to R44/45 on the right hand side of the stuffing drawing) is incorrectly labeled and should be tagged Q11drain. John Inlow


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29th August 2002, 09:01 AM	#482
skaara diyAudio Member Join Date: Jun 2002 Location: Europe, Slovenia	Are these the pcbs for grollins amp?

29th August 2002, 02:15 PM	#483
carpenter Paper mache horn fabricator diyAudio Member Join Date: Mar 2002 Location: Oregon City, Oregon	Yes, these pcbs were designed from Grollins schematics by "tvi" and enhanced by me (carpenter). I added the Aleph off-board multi-transistor approach as well as flipping around a few components. Please proof read before using. I'm careful, but human. I have etched myself a pcb and now have the components. After I finish my wife's home office, I'm going to put the pieces together. Until then, I have no physical proof to whether or not these circuits are layed out properly. John Inlow

29th August 2002, 02:51 PM	#484
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	Sorry John, where did you say we can get a copy of your PCB? Thank Vince BTW- I built your heatsinks last year and they look great. I haven't had the chance to put them to work yet...maybe on the XA! Thanks!

29th August 2002, 04:00 PM	#486
stefanobilliani diyAudio Member Join Date: Jun 2002 Location: Italy	John, Just to know that I have understand well , the sense terminal is were I put the source of each mosfet. And if can be of help: the drain of Q10 is signed two times ; one of these is the drain of Q11. Thanks very much.

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