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Aleph J for Universal Mounting Spec
Aleph J for Universal Mounting Spec
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Old 5th September 2020, 08:21 PM   #821
RainfallSky is offline RainfallSky  Russian Federation
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Quote:
Originally Posted by mbrennwa View Post
The bigger the more they will act as an antenna that picks up noise. I'd recommend to stay away for physically big caps if/where possible.
Maybe I should chose something smaller for С6, С7.
Still want C1 to be big axial cap.
Not rediculously big cap ofcourse.
This was motivation factor to learn new things like KiCad..
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Old 5th September 2020, 08:36 PM   #822
6L6 is offline 6L6  United States
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Aleph J for Universal Mounting Spec
The film bypass capacitors (C6, C7 on your board) will be removed on the next revision of Store PCBs. They are not necessary.

I'd also add a second terminal blade near ground if people want to connect speaker - on the amplifier PCB. Sometimes it's quieter to do that.

That said, C1 should be film. Add a bunch of extra holes so people can use reasonable sized capacitors or big ones, as example here;

Click the image to open in full size.

Last edited by 6L6; 5th September 2020 at 08:38 PM.
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Old 5th September 2020, 09:26 PM   #823
RainfallSky is offline RainfallSky  Russian Federation
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Definitely will add GND terminal blade
And think what to do whith C6, C7.. get rid of or use something more compact.
Will gather info for now and start to make changes a bit later.
Thank you!
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Old 14th September 2020, 12:25 AM   #824
RainfallSky is offline RainfallSky  Russian Federation
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Quote:
Originally Posted by 6L6 View Post
The film bypass capacitors (C6, C7 on your board) will be removed on the next revision of Store PCBs. They are not necessary.

I'd also add a second terminal blade near ground if people want to connect speaker - on the amplifier PCB. Sometimes it's quieter to do that.

That said, C1 should be film. Add a bunch of extra holes so people can use reasonable sized capacitors or big ones, as example here;
Some changes.

Small resistors up to RN60 size except LED risistors RN55 size.
C1 have 69.5mm lead space for big axial capacitor or 37.5mm 27.5mm 22.5mm 15mm for capacitors like FKP4 or regular MKP.
(Hole size for axial capacitor is 1mm because it was meant for specific cap with 0.8mm lead but can make it biger for versality)
C6,C7 stay. Lead space 22.5mm 15mm 5mm from FKP4 to small film caps.
Redraw silkscreen for some parts.
Q2, Q3, Q4 now ZTX/BC friendly with BCE marking.
Still only left channel board (74x260mm).
Will start to draw right channel when layout for left channel settle.
Already made change for Q2 E layout line after this scheenshots..

Still could be errors I can't see right now.
Like would LED's light connected that way.
Attached Images
File Type: png Aleph_J-L-Front.png (203.8 KB, 156 views)
File Type: png Aleph_J-L-Back.png (141.0 KB, 147 views)
File Type: png Aleph_J-L-3D.png (143.0 KB, 147 views)
File Type: png kicad_layout-a.png (100.3 KB, 148 views)
File Type: png kicad_layout-b.png (89.4 KB, 40 views)
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Old 15th September 2020, 11:33 AM   #825
eddyvb is offline eddyvb  Belgium
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The line to the gate of q1a is quite long, maybe put an optional gate stopper resistor close to the gate?
And a question, the silkscreen text ‘Aleph J’, is it a Kicad font? Would be a nice engraving this nice font on the frontplate.
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Old 16th September 2020, 12:15 AM   #826
RainfallSky is offline RainfallSky  Russian Federation
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Not sure. But could be done about 2cm closer.

Silk screen for Aleph J is not KiCad font.
I convert it to silk screen symbol in KiCad from screenshot I made of what I type in MS Word using a real font..
Font name is "The Doctor".
I also plan to make it as a copper pad without mask later.
Should look cool with ENIG and kind of meh with HASL.
Attached Images
File Type: png kicad_layout-a.png (76.3 KB, 26 views)
File Type: png kicad_layout-b.png (75.3 KB, 26 views)
File Type: png Aleph_J-L-3D.png (149.6 KB, 33 views)
Attached Files
File Type: zip The Doctor font.zip (103.0 KB, 7 views)
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Old 16th September 2020, 06:31 AM   #827
eddyvb is offline eddyvb  Belgium
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Thanks for the font RainfallSky!
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Old 16th September 2020, 11:53 PM   #828
RainfallSky is offline RainfallSky  Russian Federation
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I gave up to make it as left and right pcb's and copycat inputs location from Didiet layout.
It went much beter and could be used as one board for both channels.
Board also decreased in size to 250mm x 74mm.
Attached Images
File Type: png kicad_layout-a.png (81.5 KB, 24 views)
File Type: png kicad_layout-b.png (63.0 KB, 19 views)
File Type: png Aleph_J-3D.png (154.9 KB, 23 views)
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Old 17th September 2020, 08:55 AM   #829
eddyvb is offline eddyvb  Belgium
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Try to optimize the part placement for shorter tracks. e.g.
Rotate 180 R25, put above r26
C2 asks to be next/rotated to r26
move r24 r27 and trans to the left, maybe rotate
move trans next to r14 r15?, and move them left
resistor? connected to r7 move left
the big cap is difficult, it asks to be in the top middle of the pcb, but it's big..
where possible copy high current tracks to other layer
...

Maybe add the "Algar" mods c102 c105, a few small caps, search the forum for info. I've made a smd aleph pcb version with these mods, because I could not get the original stable at full power and high freq.
Attached Files
File Type: pdf Aleph30 by Algar_emi.pdf (34.8 KB, 11 views)
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Old 17th September 2020, 12:27 PM   #830
RainfallSky is offline RainfallSky  Russian Federation
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Thank you for a lot of valuable sugestions!
I have some ideas to make it more compact.
Will post what I got later.
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