cfa-vfa list
due to big interesting i will post an update list for all my prototypes
Nad look at post# 832,963,967.988,989,1005
Spooky #1247,1267,1292,1301
Gnome v1.3 #1455,1467,1485,1500,1516,1531,1538,1567
Symasui #1642,1671,1672,1673
Cfa ver.1.2 #1754,1756,1757,1784
Cfa v1.3 #2976
Wolverine ver1-c #3543,3564,3637,2279
Kypton C #4797,4765
Kypton V #5261,5282
Eyessee #5521
Kypton ND #6830,6850,6888
Infidel an unsuccessful IPS #5385
Ostriper schematic list. Look at post # 1
I hope this is a complete list and may be useful.
due to big interesting i will post an update list for all my prototypes
Nad look at post# 832,963,967.988,989,1005
Spooky #1247,1267,1292,1301
Gnome v1.3 #1455,1467,1485,1500,1516,1531,1538,1567
Symasui #1642,1671,1672,1673
Cfa ver.1.2 #1754,1756,1757,1784
Cfa v1.3 #2976
Wolverine ver1-c #3543,3564,3637,2279
Kypton C #4797,4765
Kypton V #5261,5282
Eyessee #5521
Kypton ND #6830,6850,6888
Infidel an unsuccessful IPS #5385
Ostriper schematic list. Look at post # 1
I hope this is a complete list and may be useful.
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Does anyone have the latest 5p ops PCBs for sale, or any recommendations where I can get them made?
update list
Nad look at post# 832,963,967.988,989,1005
Spooky #1247,1267,1292,1301
Gnome v1.3 #1455,1467,1485,1500,1516,1531,1538,1567
Symasui #1642,1671,1672,1673
Cfa ver.1.2 #1754,1756,1757,1784
Cfa v1.3 #2976
Wolverine ver1-c #3543,3564,3637,2279
Kypton C #4797,4765
Kypton V #5261,5282
Eyessee #5521
Kypton ND #6830,6850,6888
Bimo-Ostriper Symetry #8064,8066,8091
Infidel an unsuccessful IPS #5385
Ostriper schematic list. Look at post # 1
I hope this is a complete list and may be useful.
Nad look at post# 832,963,967.988,989,1005
Spooky #1247,1267,1292,1301
Gnome v1.3 #1455,1467,1485,1500,1516,1531,1538,1567
Symasui #1642,1671,1672,1673
Cfa ver.1.2 #1754,1756,1757,1784
Cfa v1.3 #2976
Wolverine ver1-c #3543,3564,3637,2279
Kypton C #4797,4765
Kypton V #5261,5282
Eyessee #5521
Kypton ND #6830,6850,6888
Bimo-Ostriper Symetry #8064,8066,8091
Infidel an unsuccessful IPS #5385
Ostriper schematic list. Look at post # 1
I hope this is a complete list and may be useful.
maxwell007,
I know that the build can be confusing...having more then one option on a board does not help. You need to follow option A in the attached schematic for your BJT output devices.
The mosfet option (labeled B on the new boards you have) was discussed around post 3795 in the main slewmaster thread http://www.diyaudio.com/forums/solid-state/248105-slewmaster-cfa-vs-vfa-rumble-76.html
and around post 160 in the slewmaster build thread. http://www.diyaudio.com/forums/solid-state/260268-slewmaster-builds-4.html
Links to certain posts seem to get messed up because I am set to view lots of posts per page.
Hope this is some help,
Evan
I know that the build can be confusing...having more then one option on a board does not help. You need to follow option A in the attached schematic for your BJT output devices.
The mosfet option (labeled B on the new boards you have) was discussed around post 3795 in the main slewmaster thread http://www.diyaudio.com/forums/solid-state/248105-slewmaster-cfa-vs-vfa-rumble-76.html
and around post 160 in the slewmaster build thread. http://www.diyaudio.com/forums/solid-state/260268-slewmaster-builds-4.html
Links to certain posts seem to get messed up because I am set to view lots of posts per page.
Hope this is some help,
Evan
Attachments
Maybe folks could check me here and correct or add as needed. I admit to not being the most technically adept person here...Just a good instruction follower.
For BJT outputs you:
install all the semiconductors
Jumper D102
Install c 108/109a not c108/109b
leave off zener diodes d104/105/106/107
For BJT outputs you:
install all the semiconductors
Jumper D102
Install c 108/109a not c108/109b
leave off zener diodes d104/105/106/107
Evan,
This is one reason it would be helpful if there were bom's for each build with recommended parts. Also individual documentation for each build option so we don't see a lot of this type of confusion by new builders who can follow clear instructions on what to put where. I've been following these threads since the beginning and it does get confusing as there are so many different variations once people start to ask about substitutions of devices and the changes needed to do that. A set of stock configurations would go a long way to cleaning this up and then there could be alternative builds shown in individual builds around the different configurations. This is where I think that Esperado's offer to help put together a web page around these builds would come in handy. You could have different tabs for each build type, CFA and VFA main tabs and then sub tabs of each individual input section and another tab covering the requirements of the output sections determined by the number of output devices. Don't forget we also have other alternative output sections also and input sections by people like Borys and others that have similar but different design layouts. We even have the vacuum tube input sections. If you haven't kept up from the beginning of these threads this would be hard to follow.
I'm no web designer so I can't help build a page but do see how I would lay this all out to make it comprehensive and easy at the same time to follow.
This is one reason it would be helpful if there were bom's for each build with recommended parts. Also individual documentation for each build option so we don't see a lot of this type of confusion by new builders who can follow clear instructions on what to put where. I've been following these threads since the beginning and it does get confusing as there are so many different variations once people start to ask about substitutions of devices and the changes needed to do that. A set of stock configurations would go a long way to cleaning this up and then there could be alternative builds shown in individual builds around the different configurations. This is where I think that Esperado's offer to help put together a web page around these builds would come in handy. You could have different tabs for each build type, CFA and VFA main tabs and then sub tabs of each individual input section and another tab covering the requirements of the output sections determined by the number of output devices. Don't forget we also have other alternative output sections also and input sections by people like Borys and others that have similar but different design layouts. We even have the vacuum tube input sections. If you haven't kept up from the beginning of these threads this would be hard to follow.
I'm no web designer so I can't help build a page but do see how I would lay this all out to make it comprehensive and easy at the same time to follow.
Is Cfa the only design of CFA amp?
If not, which has the lowest thd and highest SR?
THx-RNMarsh
A note explaining options written right on the schematic would likely help a lot. The constant request for BOMs seems silly to me. These boards will run on loads of different options for parts. Parts available here in North America may not be available in other parts of the world. Suggestion as to what characteristics of parts to look for would be much more helpful and a much better learning experience for new builders.
It seems that we all agree that we need to organize the information in a clear way. Both you guys from Canada have been involved since the beginning and know how messy this has become. Yes a set of schematics would be great with the different types of output devices. I was suggesting that in the beginning there were BOM's that Pete put out for common devices and then everybody started to ask about alternatives and this is where the confusion begins. If there were a standard bom and then alternative boms with those different devices and the changes needed to make those work it would end most of this. I'm not sure how easy it would be to do on the site since everybody starts to add their own post and that makes things messy. That is why I think the idea of a separate web page by Esperado would make this so much cleaner, you would have all this information in one place and nobody could mess it up by adding their own posts, that would be up to whoever maintained the page to keep it clean. Like I said I can see how to lay out a site like that but I'm not a coder or web page builder. It would be fairly easy for each variation to be done and given to whoever puts that information in a clean set of documents with both the schematic and the bom in a singe type of file to follow. You would just pick the input and output sections and choose the kinds of devices you have available wherever you live and you would just follow the instructions and schematics. Sort of a SlewMaster Heathkit type of thing. Anyone who could follow instructions could then build these great designs and learn along the way by coming back to this site and these threads.
Just my idea how this all can work and be done cleanly. I just don't see how you can do it here without having a way to lock out people from adding to the content?
Just my idea how this all can work and be done cleanly. I just don't see how you can do it here without having a way to lock out people from adding to the content?
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Suggested parts are clearly listed right on the schematic for almost all inputs and outputs. That's really better than any BOM if people take the time to look at it. This latest output board definitely needs a little more though. I'll try to make it a little more useful later today if I get time. Part selection in one colour for BJT and another colour for FET would probably help a lot.
JW,
So that becomes the stock bom, the parts listed on the boards themselves. But then you start to get all these questions about substitutions and the mess begins again. That is why I think it would be neat to have all that alternative information in one place where you could just search for the devices you have wherever you live and it would give you all the other required parts changes to make it work without getting oscillations and such other problems. I know you can't cover every possible alternative set of parts but there have been many combinations along the way that have been made to work by Thimios and others. Just trying to find those different variations now is getting hard as the thread is getting pretty long and convoluted. I guess it is up to Pete if he wants this to happen or to someone if they want to go back now and pull out that information. Christophe, Esperado, has offered his services to do it if others would help with extracting the different parts combinations.
So that becomes the stock bom, the parts listed on the boards themselves. But then you start to get all these questions about substitutions and the mess begins again. That is why I think it would be neat to have all that alternative information in one place where you could just search for the devices you have wherever you live and it would give you all the other required parts changes to make it work without getting oscillations and such other problems. I know you can't cover every possible alternative set of parts but there have been many combinations along the way that have been made to work by Thimios and others. Just trying to find those different variations now is getting hard as the thread is getting pretty long and convoluted. I guess it is up to Pete if he wants this to happen or to someone if they want to go back now and pull out that information. Christophe, Esperado, has offered his services to do it if others would help with extracting the different parts combinations.
That's why I suggest listing attributes for optional parts as opposed to actual part numbers. Finding a compatible output device is much easier if you are running lower voltage rails. Output's just need to handle a little more voltage that the sum of both rail voltages. Capacitor selection is much better if you can get away with 63V parts. Ect. It also helps make sense of what you are looking for when you are learning.
JW,
That is a good idea. The only thing is it assumes the new builders would understand what happens when you change the transformer voltage and all the changes that go with it. A good set of suggestions and some easy explanations of why you need to make the changes would go a long way to making this simple for the new builders. I assume that those like you and others like Terry know enough to make these changes on their own, it is only the truly new builders who will have all the questions about all of this.
That is a good idea. The only thing is it assumes the new builders would understand what happens when you change the transformer voltage and all the changes that go with it. A good set of suggestions and some easy explanations of why you need to make the changes would go a long way to making this simple for the new builders. I assume that those like you and others like Terry know enough to make these changes on their own, it is only the truly new builders who will have all the questions about all of this.
Just a small idea it would erase all these type confusion 🙂
I don't know if it would be possible to post separate the schematic with the BJT and separate for the mosfet version
I know it take times to edit the circuit like that but it would be very helpful
😎
Greetings