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
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
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
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
An externally hosted image should be here but it was not working when we last tested it.
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
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
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:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=87925&highlight=
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, 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:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=87925&highlight=
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.
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
steenoe said:1: Dont turn on the telly, ever
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
I turned off my TV roughly thirty years ago. I've watched it twice since then--when the Challenger exploded, and during the first Gulf War. I will watch a DVD of a movie, but that's not even a weekly event at this point, much less daily.
I never seem to have enough time to get things done, but if I was sitting in front of a television, I wouldn't get anything done at all. As it is, I've been tied up with a couple of plumbing related problems and other fun stuff, but have managed a few useful (in the sense of electronics) things.
For one thing, I have managed to get my hands on a large quantity of J271s. Hot diggity dawg!
Grey
P.S.: I've probably said it before, but I'm always amazed by the number of people who will respond to my comments that there aren't enough hours in a day with, "Oh, I know just what you mean! I never seem to get anything done, either." Invariably followed by, "Did you see CSI [or whatever show is 'hot' this week] last night? I just can't believe what John [pick random character name] said when Elaine asked him..."
Oh, how I wish I had some way to access all those wasted hours that others seem not to want or care about.
steenoe said:Thats why we teamed up
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
It's really about as simple as that
Lots of people ask how I manage to find the time....very simple, no watching telly.
I actually don't even have a telly.
From time to time somebody thinks that this poor guy whom has no telly....should have one as a gift.
The result of that is that no matter how poor you might be, if you know me- you got a telly, as they are handed on to the first person I see whom wants it
I simply can't understand how people find the time for the average 3 or 4 hours of TV every single day. It would stress me out!
Magura
Carawu's comic strip, say's it all Its a total waste of your life, starring into that totally empty screen. Most people cant even remember what they were trying to see the day before.
Build yourself one of Mr. Pass's amps and put on a good album, like the one Blues mentioned. You will remember that event for a long time If it wasnt for the other (beautyful) part of the household, the TV would go right out the window
If you want to see the grass grow, then at least do it under the blue sky!
Steen
Its a total waste of your life, starring into that totally empty screen. Most people cant even remember what they were trying to see the day before.Build yourself one of Mr. Pass's amps and put on a good album, like the one Blues mentioned. You will remember that event for a long time
If it wasnt for the other (beautyful) part of the household, the TV would go right out the window If you want to see the grass grow, then at least do it under the blue sky!
Steen
I have a somewhat theoretical question.
In US Patent 4168471, Sampei (Hitachi) described a stability criterion for oscillations between parallel FETs, and derived a equation for the minimum gate stopper resistance.
Applying his formular, I derived at a minimum R of some 800 ohm for the gate stoppers, using datasheet information and the F4 configuration as published (see attched Excel sheet).
My question would be, why could we get away with much less and are still stable with some margin ?
Did I do my sums wrong, or is Sampei's formular too conservative ?
Thanks in advance and best regards,
Patrick
In US Patent 4168471, Sampei (Hitachi) described a stability criterion for oscillations between parallel FETs, and derived a equation for the minimum gate stopper resistance.
Applying his formular, I derived at a minimum R of some 800 ohm for the gate stoppers, using datasheet information and the F4 configuration as published (see attched Excel sheet).
My question would be, why could we get away with much less and are still stable with some margin ?
Did I do my sums wrong, or is Sampei's formular too conservative ?
Thanks in advance and best regards,
Patrick
