I have a request for symasui PCB which I made it myself using schematic in post 590, here is zip file containing Kicad and Gerber. I build it and test it, it runs OK with no problem but I did not use oscilloscope to probe it.
Thank you for the feedback and sharing the layout. Everything opens problem free using KiCad 7.
What output stage did you use with it?
I am using mini EF posted in #1 by OS. It should work with any ops with pin compatible to this or you could use a cable.
It's .rar file you will need winrar.
It's .rar file you will need winrar.
dear chat72 ,please can you open the .rar-file in post 701 to the pdf-format, as rar doesnt convert on my laptop. Thank you
ingo
ingo
hi,
.rar is another form of compressing folder, same as .zip, .7z etc.
just install freeware "7-zip" app, it will open it and uncompress to specified location
all files are inside symasymui.rar
Files in Zip format you should be able to open it with windows.
SymasuiZip has everything
GerberZip all gerber files are in there just send it to Fab house.
Symasui.pdf pdf file of each layer.
SymasuiZip has everything
GerberZip all gerber files are in there just send it to Fab house.
Symasui.pdf pdf file of each layer.
hi
a question regarding "BEAST EF3" ops; value for R111 is 150ohm as per schematics and 220ohm as per BOM; which value is correct?
"MINI EF3" R111 is 220ohm; c112 value is the same for both
a question regarding "BEAST EF3" ops; value for R111 is 150ohm as per schematics and 220ohm as per BOM; which value is correct?
"MINI EF3" R111 is 220ohm; c112 value is the same for both
Either would work , that resistor just sets the global current for the class A drivers. My smaller EF3 uses a 1W 270R (4.5mA) . 150R=10mA 220=6.5mA
This could slightly affect the bias range , but you have 10 turns of the trimmer (lots of spare range).
Drivers would be warmer with the smaller value , as well. Performance is the same.
Edit - "beast" uses the big drivers (TO-3p) , they prefer 150R.
OS
hi guys, a question: have any of you tried to build hellraiser complete with Arcwelder mini EF3 power stage?
To my knowledge , no one had built "hellraiser". A similar design was built in "slewmaster" days.
Hellraiser is a newer version of a 8 year old design.
Mini was built and there was 1 error , present "mini" is corrected.
PS - anyone who either builds a spooky or hellraiser will have the first AB amp that uses a voltage controlled CCS servo.
NO OEM or forum amp has this.
OS
Hellraiser is a newer version of a 8 year old design.
Mini was built and there was 1 error , present "mini" is corrected.
PS - anyone who either builds a spooky or hellraiser will have the first AB amp that uses a voltage controlled CCS servo.
NO OEM or forum amp has this.
OS
hi ostripper, I would have finished the entry stage with kicad right now. I think I reported everything without errors ( with the information you gave ). If you like, I can share it here and do a check, and then proceed with the final stage. The invitation is also addressed to anyone who is interested, of course.
Un saluto to all of you guys
Ros
Un saluto to all of you guys
Ros
I went back a few threads , only the dual packages had any suspected errors (spooky-hellraiser)??
Hellraiser is all singles , with the one Toshiba P/N dual.
It's the dual is what you have to double check (Q5N/Q4P - below).
The EF3's are tested.
OS
Attachments
good morning ostripper and everyone , thank you very much for your help. The reference scheme is the one you posted a few days ago; now I'm missing the latest updated bom (I have an incomplete bom where some values are different from the schematic). Can you tell me where I can find it please? thanks again, greetings to all Ros
Which one ? If you tell me which one I will update the BOM.
What is truly nice is that any small value difference in my designs will still result in a working
unit. I design to allow a wide variance in sourcing. Just about ANY modern semi would give the same
specs/stability. I've used 22-68pF cdom for spooky/hellraiser. THD ranges from 1-15PPM if you do that.
Most modern SMD bipolar's are 80-120 Mhz - circuit does not mind.
You want "hellraiser" - this seems to be the best version of it (below).
I have not been here for awhile , but I will backtrack through this thread and refine even a small complaint or
discrepancy. I'm using "Spooky' with a Wolverine board now - I want Hellraiser.
OS
What is truly nice is that any small value difference in my designs will still result in a working
unit. I design to allow a wide variance in sourcing. Just about ANY modern semi would give the same
specs/stability. I've used 22-68pF cdom for spooky/hellraiser. THD ranges from 1-15PPM if you do that.
Most modern SMD bipolar's are 80-120 Mhz - circuit does not mind.
You want "hellraiser" - this seems to be the best version of it (below).
I have not been here for awhile , but I will backtrack through this thread and refine even a small complaint or
discrepancy. I'm using "Spooky' with a Wolverine board now - I want Hellraiser.
OS
Attachments
This is what I was looking for ... be verbose - I'll fix it . spooky should easily work.
Hi Ostripper, the one with the smt components, the one with the HN1B01 chip at the input stage so to speak.... don't worry I have all the time so when you can you have 5 minutes left over I would be happy to receive your explanatory answers. greetings Ros
