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Old 21st March 2007, 06:48 AM   #121
EUVL is offline EUVL  Europe
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Very nice.

May I ask how do you do the component prints on the top side ?


Patrick
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Old 21st March 2007, 08:31 AM   #122
cviller is offline cviller  Denmark
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Default Another singlesided layou

For people with long heatsinks >= 30 cm

The design is single sided, but there are a few jumpers marked on top level. I have tried to stay as true to papas design as possible.

Both channels are in the same pcb file, so you'll need to cut them apart before or after etching (I plan to do it afterwards). Another tip is to trim the edges towards the heatsinks as much as possible without cutting the gnd trace. This way it should be easier to mount the TO-247 transistors.

Schematics:
http://viller.org/audio/2007mar_f4/f4_l.pdf
http://viller.org/audio/2007mar_f4/f4_r.pdf
Layout:
http://viller.org/audio/2007mar_f4/f4_pcb.pdf

I have included my psu, which is the only thing I have finished. I was inspired by papas cool little psu, but I have removed all the flexibility. The jumpers are there to make it possible to have + and - rail on both sides of the psu board.

Schematics:
http://viller.org/audio/2007mar_f4/crc_simple_sch.pdf
Layout:
http://viller.org/audio/2007mar_f4/crc_simple_pcb.pdf
Picture:
http://viller.org/audio/2007mar_f4/psu_top.JPG
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Old 21st March 2007, 10:43 AM   #123
veteran is offline veteran  Poland
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Nice work guys. PS board is the same as for ZV9 amplifier design:
http://www.unisonus.com/pdf/ps_zv9_pcb.pdf
http://www.unisonus.com/pdf/ps_zv9_pcb_top.pdf
http://www.unisonus.com/pdf/ZenV9_PS.pdf

Click the image to open in full size.
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Old 21st March 2007, 01:50 PM   #124
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Quote:
Nice work guys.
The credit on that board / layout is all yours.



I learn a little something more each time I use someone else's work.
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Old 21st March 2007, 02:38 PM   #125
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My words exactly - thanks for the layout Veteran

EUVL - I used the toner-transfer (iron on) method to imprint the top layer - the image has to be reversed, so I used photoshop to reverse it, but the size is just slightly off by a few millimeters (too small) after cut&pasting into photoshop.

I found the etching information through another thread on the forum, I'll try and find the thread and post a link here

And once again, thanks to CVILLER and Veteran for the PSU layout - I was trying to get the exact layout CVILLER came up with, but was having no luck with Eagle , now I have to choose one to use (what a good problem to have)

Stephen
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Old 21st March 2007, 02:45 PM   #126
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Hi Stephen,

The boards look good! Did you use photosensitive
boards or was the copper pattern also ironed on?

Cheers,
Dennis
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Old 21st March 2007, 04:01 PM   #127
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Hi Dennis,

No, I used plain copperclad boards and ironed the trace side as well, etched, drilled, acetone (nail polish remover) and then ironed the top layer on.

As promised in previous post, here's a link to the pcb making procedure:

DIY ZV9 boards with Inkjet Photo Paper

The next thing I need to figure out is orientation and pinout for the 2SJ74BL and 2SK170BL I'm using in place of the 108 and 370.
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Old 21st March 2007, 04:06 PM   #128
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Why not use a fet diamond follower as input stage to avoid the 220uF capacitors, first follower sources followed by about 400 Ohms resistors( for an Id about 10mA) to set the ~8V mosfets bias (2*4V)?
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Old 21st March 2007, 04:09 PM   #129
cviller is offline cviller  Denmark
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Quote:
Originally posted by twitchie
The next thing I need to figure out is orientation and pinout for the 2SJ74BL and 2SK170BL I'm using in place of the 108 and 370.
No problem, they're all dgs!
(Round edge on 170 corresponds to short side on 370)
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Old 21st March 2007, 06:04 PM   #130
steenoe is offline steenoe  Denmark
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Quote:
cviller - you are just as bad as Steenoe
Thats why we teamed up If you want to finish something; here is rule number 1: Dont turn on the telly, ever Its the single most annoying and disturbing thing, and should be forbidden by law! I mean it. I only look at it, when I put a Blues-film on the DVD player.
Rule number 2: Dont let the sofa jump on your back, when you get home from work! If you let it, you are a lazy ###, fill in the dots as you please
Thats two simple rules to get you going, and finish stuff! Its as simple as that

Steen
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