Aleph J Schematic - Page 20

hifimaker · 15th November 2007, 08:44 PM

Just a couple of suggestions for the PCB.

Move the 3 resistors circled in red farther away from the solder pads they cross, similar to the same resistor at the top right.

See the suggested layout for the LED and resistor placement change made in this mock-up.

-David

Holger Barske · 15th November 2007, 09:20 PM

Thx Dave for taking care.
Done as you proposed, and added that "if you want to, you can add a trim pot to R8 / R27 and, after fiddling out the correct value, you may replace it with a fixed R; if you don't care at all, just solder those yellow jumpers"-feature:

hifimaker · 15th November 2007, 10:44 PM

Hi Holger,

Nice work so far. Of course we have to have the "Steeno" multi-cap option for C1, that was recently added.

Could we see a version without the silk screen or components in place? It would be nice to see the gaps between the traces and pads.

One other thought is to move the V+ slightly to the left for more clearance.

-David

Holger Barske · 15th November 2007, 11:41 PM

Dave,
here ya go: http://www.hb001.de/alephjpcbbottom_rc8.pdf
Drill sizes minmized, easier for homemade pcbs.

Quote:

It would be nice to see the gaps between the traces and pads.

Clearance is above 8 mil everywhere, this is what most board houses ask.

Quote:

One other thought is to move the V+ slightly to the left for more clearance.

Not a good idea. Need some space for the pcb mounting studs around the corner holes. Moving the pad to the left might cause a short between V+ and the grounded chassis.

jacco vermeulen · 16th November 2007, 09:21 AM

Quote:

Mit der jeder das tun kann, was er will

An additional Lochchen under R4 would be nice to allow for 10mm specimens.
(provided you're not sending Christian to Buerklin to get some 6mm 0.6W/TK25 Yageo's)

For DIY picoFarad squeezers :LC

ticktock · 16th November 2007, 09:59 AM

Hi Zen,

signature isn't complete, but, of course, there's no EMT in the system
at the moment.
Had a nice pair of naked TSDs here til April.
Looking for TU2/TU3 now...

ps: welcome to analog-forum !!

chinsettawong · 16th November 2007, 06:15 PM

Hello!

I notice that there will be 4 mosfets per channel in this set up. Do these mosfets need to be matched?

Wachara C.

Zen Mod · 16th November 2007, 06:40 PM

Quote:

Originally posted by chinsettawong
Hello!

I notice that there will be 4 mosfets per channel in this set up. Do these mosfets need to be matched?

Wachara C.

yup:

upper two are pair

lower two are pair

ticktock · 18th November 2007, 03:56 AM

Hello DIYers,

what's the proper rating for the transformer?

300 VA ?? Will 500 VA be harmful ??

Babowana · 18th November 2007, 04:18 AM

Quote:

Originally posted by ticktock

Will 500 VA be harmful ??

Yes, but harmful only for your money pocket.

15th November 2007, 09:20 PM	#192
Holger Barske diyAudio Member Join Date: Jan 2001 Location: Ruhrgebiet	Thx Dave for taking care. Done as you proposed, and added that "if you want to, you can add a trim pot to R8 / R27 and, after fiddling out the correct value, you may replace it with a fixed R; if you don't care at all, just solder those yellow jumpers"-feature: __________________ Best regards: Holger www.holgerbarske.com - Deutschsprachiges Paradise-Support-Forum

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15th November 2007, 10:44 PM	#193
hifimaker diyAudio Member Join Date: Oct 2003 Location: San Jose	Hi Holger, Nice work so far. Of course we have to have the "Steeno" multi-cap option for C1, that was recently added. Could we see a version without the silk screen or components in place? It would be nice to see the gaps between the traces and pads. One other thought is to move the V+ slightly to the left for more clearance. -David

16th November 2007, 09:59 AM	#196
ticktock diyAudio Member Join Date: Dec 2006	Hi Zen, signature isn't complete, but, of course, there's no EMT in the system at the moment. Had a nice pair of naked TSDs here til April. Looking for TU2/TU3 now... ps: welcome to analog-forum !!

16th November 2007, 06:15 PM	#197
chinsettawong diyAudio Member Join Date: Jun 2006	Hello! I notice that there will be 4 mosfets per channel in this set up. Do these mosfets need to be matched? Wachara C.

18th November 2007, 03:56 AM	#199
ticktock diyAudio Member Join Date: Dec 2006	Hello DIYers, what's the proper rating for the transformer? 300 VA ?? Will 500 VA be harmful ??