Hi Terry, not trying to argue so please don't take it as such.
It is very inefficient and wasteful for everyone who wants
to do one of these builds to wade through everything all
the time.
One may also think that because they spent a year and one half
in a thread to do something, everyone else should have to
spend time going through it too.
Either way going through everything causes more problems that one
might first suspect.
How do we ensure the design fix or a change is part is noted
after 50, 100, 130 posts have gone by?
One example that I encountered on the HP339a modification
was making changes to the back removable board. This was
documented in a the long distortion analyzer thread. However
at some point that whole board modification was abandoned.
My guess was at maybe post 2500?
It was not an Obvious abandonment of it and it cost me maybe
six months to a year of time trying to identify source of problem.
It is very difficult for everyone when we spend a lot of time doing
something and accomplish it....It is very uncommon to want to
show people where the short cuts are and summarize it so others
wont have to start form square one. It is human nature.
However, it we want our hobby (whats left of it) to thrive
we have to try and summarize, write, take time to help
others, make it easy for them, for us, for everyone.
We, as a species survived because we worked together
and collaborated, helped each other out, wrote things
down for others.
Imagine what it would be like if we had to keep reinventing
navigation or making maps? Imagine if we had to keep
reinventing the wheel, or knowledge wasn't passed down.
Let's keep that vial of plutonium in our pockets like
Madaam Curie.
Let us forget that the ancient Egyptians knew that asbestos
was harmful and deadly and the workers in the mines died
from it.
Oh wait, we did forget.
Summarize, make it easy for people, optimize everyone's time,
share, collaborate, document, review, keep moving forward
and give others a hand, we all move forward faster that way.
|
Now, I'm beginning to sound like Deming, LOL.
FYI, I couldn't get the link to work. : (
Let me find it again and send to you. Might be in your spam
email address. There are a couple of minor typos there that
I found and fixed. Have to spread it out and separate everything
to get it to work.
For me personally, I still have zip problems with win 8.x, I got
windows to do it once. but then the free zip trial keeps forcing
itself to the foreground. Can't remember how to UNDO it
from taking over the files.
Thanks JW.
Sent it again
JW,
Sent it again, it is an .xls file. If you need excel 95 let me know.
I'm not sure what the new version of excel is but if it is in that
format, the older versions won't open it, because Microsoft
wants you to rent software on a monthy basis.
Kind of like the new version of Spirt, or Sprite, v6.0 for boards.
Big Brother is alive and growing ever more powerful.
When we ALL realize it, it will be too late.
JW,
Sent it again, it is an .xls file. If you need excel 95 let me know.
I'm not sure what the new version of excel is but if it is in that
format, the older versions won't open it, because Microsoft
wants you to rent software on a monthy basis.
Kind of like the new version of Spirt, or Sprite, v6.0 for boards.
Big Brother is alive and growing ever more powerful.
When we ALL realize it, it will be too late.
I'm not a Microsoft Office fan at all. Open Office will open just about any file and it's free.
I received your spread sheet. Thanks.
You can cure most of your zip problems with Winrar. Rar files are getting to be much more popular than zip files and Winrar does both formats easier than Winzip.
Sorry, I typed that on my tablet and messed up the link. Here it is again.
http://www.diyaudio.com/forums/solid-state/260268-slewmaster-builds.html
Please understand that I wasn't saying folks shouldn't help each other. I do my best whenever possible. Unfortunately, I am probably the least knowledgeable of all the folks in this thread. I love the whole process of soldering and testing and troubleshooting so I build just about everything I can get my hands on. They rarely work the first try so I usually need help in hunting down the problem. Sometimes it is my fault and sometimes it is circuit related and the designer will help me solve it and we get a solution. Most of this is well documented in the thread if someone cares to read and follow the process.
The search feature is your friend. If you search for each IPS by name it will take you to all the posts about that particular IPS and you can follow along and see what was needed to get it working. The build thread is probably the best place to do that.
Blessings, Terry
Fine tuned the FET option ....
I used the close SMD jumper method to make the ops "FETable". Add the LED,
omit a few Resistors and semi's.
Upper row of drivers/Vbe is for Toshiba 1837/4793's ( "B" marked) , plus
the solder bridges (B , as well). Original "unhacked" VFET output stage.
Stuff everything normal for the BJT EF3.
Labling and the "book" might be as much work .... but different , non-
perceptional type endeavors.
PS - wonder if there is alternative to fast-ons .... PCB Euro-terms go from
15A normal 5mm to 10mm (80A) "monsters". Nothing in the middle (30A/7.5mm) ??
OS
I used the close SMD jumper method to make the ops "FETable". Add the LED,
omit a few Resistors and semi's.
Upper row of drivers/Vbe is for Toshiba 1837/4793's ( "B" marked) , plus
the solder bridges (B , as well). Original "unhacked" VFET output stage.
Stuff everything normal for the BJT EF3.
Labling and the "book" might be as much work .... but different , non-
perceptional type endeavors.
PS - wonder if there is alternative to fast-ons .... PCB Euro-terms go from
15A normal 5mm to 10mm (80A) "monsters". Nothing in the middle (30A/7.5mm) ??
OS
Attachments
Last edited:
Terry, I have to respectfully disagree with that statement. With as many amplifiers you've built and troubleshooted, I know without a shadow of a doubt that you know MUCH more about power amplifiers than I do.
For instance, I have no idea how you connect these "IPS" boards to the "OPS" boards.
I don't understand NFB in power amplifier circuits, but understand it in op-amp circuits.
I do understand a few basic things like biasing and DC-offset.
So if I try to build one of these amplifiers, it looks like I'll be posting plenty of questions over in the build thread.
I have never even built a power amplifier before. I've built plenty of line stage/headphone amps, but never a power amp.
Thanks...
Just a thang, no biggie, but OS calls it a Kypton, others call it a Krypton, and one called it a Kapton. I've been following from the get go, so no problem here, but I could see it causing noobie angst. Might be good to decide what it is, or maybe it doesn't matter.
Great thread, makes a guy want to build a dozen amps!
Great thread, makes a guy want to build a dozen amps!
Terry,
I understand. You are doing a great thing here and for everyone
building this, making your own boards and prototyping everything
as OS designs them.
JW,
What I've found helpful with excel, once you get it in
data columns, it's easier to work with. html is kind of a pain.
ammel, I started a wiki to try and document the process and boards
and builds so folks wouldn't have to wade through all the problem
thread and miss something important. You get numb to it all
after a while.
Then you can link to all the updates, trouble shooting, when
you need them via links.
What is nice about the wiki like the first page of a thread
is that when you tweak your design 30 posts later when
something crops up...when you update the thread you can
also update the wiki...the wiki is in just one place which
is update a ble. Which makes it very reader friendly.
wiki's have their own set of issues for it though.
OS
I see the NJW0821s are available again at mouser....everyone was out of them last I looked, will try to keep some around for builds. : )
Thanks for your patience with me folks....I'm slowly becoming
less confused.
Mars,
I can't remember names well any more but I keep trying, I'm up a creek
if spell check doens't catch it and many times spell check can't suggest.
Hopefully after I get the baby to bed I can have some peace and work
on something. I don't like soldering, desoldering, etc with the baby
around...even if they say it isn't harmful. If I test anything it's too
dangerous with a kid around....it's either kid, chaos, or health...
other than that things are just fine.
I understand. You are doing a great thing here and for everyone
building this, making your own boards and prototyping everything
as OS designs them.
JW,
What I've found helpful with excel, once you get it in
data columns, it's easier to work with. html is kind of a pain.
ammel, I started a wiki to try and document the process and boards
and builds so folks wouldn't have to wade through all the problem
thread and miss something important. You get numb to it all
after a while.
Then you can link to all the updates, trouble shooting, when
you need them via links.
What is nice about the wiki like the first page of a thread
is that when you tweak your design 30 posts later when
something crops up...when you update the thread you can
also update the wiki...the wiki is in just one place which
is update a ble. Which makes it very reader friendly.
wiki's have their own set of issues for it though.
OS
I see the NJW0821s are available again at mouser....everyone was out of them last I looked, will try to keep some around for builds. : )
Thanks for your patience with me folks....I'm slowly becoming
less confused.
Mars,
I can't remember names well any more but I keep trying, I'm up a creek
if spell check doens't catch it and many times spell check can't suggest.
Hopefully after I get the baby to bed I can have some peace and work
on something. I don't like soldering, desoldering, etc with the baby
around...even if they say it isn't harmful. If I test anything it's too
dangerous with a kid around....it's either kid, chaos, or health...
other than that things are just fine.
Last edited:
There a lots of good alternatives for spread sheets these days. You can save them to a Google drive and open them in Chrome too. I'll check out LibreOffice some day. Thanks.
Sounds nice Sync.
Where's the wiki located?
I was hoping there might be some type of "beginner's guide" to building these "Slewmaster" amplifiers. I'm sure it isn't rocket science, but one has to start somewhere.
Thanks...
That's why it's taking so dang long for this new output stage. I have to
Really "humanize" this part of the project.
If you do 2 pair or 5 pair , advice on which positions to use require a nice
written paragraph.
As well as questions about cap size for C111/113 or C116/118 (below).
I never did that on the V1.0 slewmaster. It is more necessary here because
there is both the "A/B" option (BJT/FET) AND the size of the stage to consider.
Even fuse size would be different between a 2-3 pair BJT and a full
5 pair MOSFET setup.
"OPTIONS" always discouraged a first time builder .... unless it was explained
perfectly what - EXACTLY you need to do for that option.
OS
Attachments
It's about as simple as a two stage op-amp filter - the IPS output powers
the OPS input. But , my OPS also supplies clean power back to the
IPS. All on 6 pins (can't plug it backwards).
NFB from this output stage has connector and wire , which goes to another
connector on the IPS.
Like a REAL big OP-amp ! (output to inverting input - ).
When all is built (correctly) ... just a op-amp that runs on +/- 70V with
all the parts out in the open air.
OS
The wiki is nothing special, it is a start.
In the middle blue bar above
"Home" "Forums"....is the "Wiki" drop down arrow.
pull down to the 2nd option, (List)
Then look for "Slewmaster Builds".
We all can post drafts there.
It's kind of like OS designing...
Writing is a messy business...
The most difficult thing is to make it simply.
The most difficult way to write is clearly.
From the wiki, OS or others press the edit tab,
then scroll down to view the skeleton document.
In sert the text there. OS, I'm good at tweaking
words prases, etc....just put it over there as no
on will know and I'll work on it for you.
I've spent 20 years righting about tecnical stuff I hated
but I got good at it. I mean who really want to get stuck
writing for three years about a phone system database of 15,000 pages that
no one will ever read. ung.
Or at least you guy might run in the
mouth with your colleagues.....I run my fingers at them.
Sometimes it even amazes me how much Shirt (no r) these fingers
crank out. And then there are the night meds it gets really wierd faxed
almost holusination. These tesxt boxes befcome 3 d, the keyboard
starts to meltand it gets all musy and crumpled up, stuck at times.
OS Find a good spot to past your draft in, No worries it will ge better.
guaranteed. Those too letters over there-----will ge are amazing.
The ge comes forward off screwn about 1/8 inch and the red underline
has changed dimentions, like a flying rug, under the letters and supporting
the letters but sticking out off the screen about 1/8 inch.
OH yeah, when you are don't make sure you save it at the bottom of the screen ..."In at the bottom of the " looks like is it wrapped around something
like a tenis ball and it curves liks that too. The
JW you can post the spreadsheet over there in the wiki or link it.
It is editable so we can have caps etc. We can make a small sub project
workingit if ou like. Plese -- JUST CHECK YOUR SPAM FOLDER.--Thank you.
IF you need some more slobber aobut the wiki ddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd
In the middle blue bar above
"Home" "Forums"....is the "Wiki" drop down arrow.
pull down to the 2nd option, (List)
Then look for "Slewmaster Builds".
We all can post drafts there.
It's kind of like OS designing...
Writing is a messy business...
The most difficult thing is to make it simply.
The most difficult way to write is clearly.
From the wiki, OS or others press the edit tab,
then scroll down to view the skeleton document.
In sert the text there. OS, I'm good at tweaking
words prases, etc....just put it over there as no
on will know and I'll work on it for you.
I've spent 20 years righting about tecnical stuff I hated
but I got good at it. I mean who really want to get stuck
writing for three years about a phone system database of 15,000 pages that
no one will ever read. ung.
Or at least you guy might run in the
mouth with your colleagues.....I run my fingers at them.
Sometimes it even amazes me how much Shirt (no r) these fingers
crank out. And then there are the night meds it gets really wierd faxed
almost holusination. These tesxt boxes befcome 3 d, the keyboard
starts to meltand it gets all musy and crumpled up, stuck at times.
OS Find a good spot to past your draft in, No worries it will ge better.
guaranteed. Those too letters over there-----will ge are amazing.
The ge comes forward off screwn about 1/8 inch and the red underline
has changed dimentions, like a flying rug, under the letters and supporting
the letters but sticking out off the screen about 1/8 inch.
OH yeah, when you are don't make sure you save it at the bottom of the screen ..."In at the bottom of the " looks like is it wrapped around something
like a tenis ball and it curves liks that too. The
JW you can post the spreadsheet over there in the wiki or link it.
It is editable so we can have caps etc. We can make a small sub project
workingit if ou like. Plese -- JUST CHECK YOUR SPAM FOLDER.--Thank you.
IF you need some more slobber aobut the wiki ddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd
Thank you for explaining the correlation between the output and input boards.
It makes so much more sense to me now comparing it to a op-amp circuit.
Too many options may be discouraging or overwhelming to some folks, but I feel like I can decide on something and go with it.
I like Terry's idea when it comes to options. Build all of them and see what you like.
I like Terry's idea when it comes to options. Build all of them and see what you like.
Jeff , I want your opinion (as a "men of action" type)
.On -
The fast-ons .... I made a special solder mask to really make them
hardy with strain relief.
My take on JK's artwork - I had to redraw all to sprint 5. Does
sprint 5 have any issues/conflicts with the board houses ?
My decoupling - I ditched the 10 small caps at the output collectors
and have a much bigger set of caps right in the middle of the rails , decoupling
should electrically be the same ... less soldering.
My BJT/FET option setup. Bridge the "B" SMD pads. I could not think
of a better way to make for this changover.
Any other wants/suggestions , the board matches the original + 25mm
most holes line up perfect (with JK's V1.3).
I'm labeling now.
OS
Attachments
OS,
Starting to figure it out, slowly. Not sure when to ask about BJT or FET differences.
Assume either will work 3 pair locations 1/3/5. Will have to wait and see how to put
it together. Sounds like even I will be able to figure it out.
Don't ask me how my kid got to the d key. Sorry about that.
Starting to figure it out, slowly. Not sure when to ask about BJT or FET differences.
Assume either will work 3 pair locations 1/3/5. Will have to wait and see how to put
it together. Sounds like even I will be able to figure it out.
Don't ask me how my kid got to the d key. Sorry about that.