No functional difference, just missing some multi-pitch holes and there actually are no added holes for the small driver heat sink. I think that the drivers are stout enough to hold the small piece of sheet aluminum just fine.
I take it then that the hole pitch for the capacitors is for the larger dimension then? I don't see any real reason the you would even need to mount the thin aluminum that you would use for the heat sink besides some mechanical vibration but I do think I see the two holes you had added for that. Looks great, I'm game. Now we just need those Go-Nads and we have a completed design.
The output decoupling is only the 5mm LS, no 3.5mm LS there and for the 470µF caps in the CM supply they are also 5mm LS, no 7.5mm LS. Also, I verified that there are no added holes for the driver heat sink, those came too late and I already submitted my files.
😎 😱
That looks like a ni-chrome toaster wire power source !
I'm on the spook now ... (below) added the trimmers and "magic"
resistors to the hawksford.
Even in layout , I'm trying to match the Gonad to the spook.
They have the same -
-servo circuit ... a accuphase-H/K hybrid / non-inverting .2hz Fc deal.
-CCS/trimmer "deal" , no rework to choose resistor values/adjust vas current.
-VAS - hawksford/led/"magic" R with larger (12mm) Re and LED dropping resistor pads.
The "Spook" is up to almost 78 components ! 😱
(Gonad is 58).
OS
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That looks great Jason. Wow, that was quick. May I ask how much they ended up costing after shipping?
The boards I ordered are from your next generation.
I have a question. If I wanted to try using my Symasym boards as the front end. Where would I attach them to the Slewmonster boards? I am attaching a schematic.
Thanks, Terry
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These were a reasonable price considering the supplier's speed. I don't want to derail OS's thread with board sales / distribution, so any interest needs to be expressed via a PM an NOT here. As to your question Terry, I'll answer it privately.
As for the Sysasym as a front end, looks to me like +V would connect to the left of R31, -V to the left of R32, PD to the collector of Q5, ND to the collector of Q6(? image is lowish resolution), NFB to the bottom of R29 / C14, and GND to the ground on the Sysasym board.
Edit the edit: Ah, I see OS has added an diagram for you, even better.
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look below , the classic SYM with just the IPS critical components.
Note the Re change at VAS and the CCS modification.
Just make sure VAS collectors are passing 4-5ma , OPS will love it !!
PS - you could add 2 1k resistors to VAS collectors - feed back to nfb , run
IPS independently. Then calculate the I from the resistors. The sym ... as I remember,
might already run at 5ma VAS .... but this (the slew), is a higher voltage amp !!
OS
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Hi Jason,
Thanks. I realized I should have asked about the boards in a PM after the edit time limit. I had though it would attach at Q5 and Q6 but I noticed that on the Symasui it looks like OS kept R18 and R20, (R17 & R18 on Symasui). I only ask because I have some empty SymaSym boards that may get me started while I figure out how to get some boards etched for some of OS's front ends.
Thanks, Terry
Hi OS,
Sorry, we were typing at the same time. I did have a question about Q7 & Q8. The SymaSym uses BC546B but I'm thinking those won't work for high rail voltage. Is there a good substitute for those that can take rails in the 70V range?
Thanks, Terry
Sorry, we were typing at the same time. I did have a question about Q7 & Q8. The SymaSym uses BC546B but I'm thinking those won't work for high rail voltage. Is there a good substitute for those that can take rails in the 70V range?
Thanks, Terry
Terry,
How many boards did you order? I could practically drive over, not really, but you are so damned close. Your boards have the dual hole pattern for the caps and the mounting holes for the heatsink and are the final version OS posted? I'm not in a big hurry for whoever has them available. I still would want the latest version of the Gonad and would need to order all the parts as I don't have any E waste, just lots of 1/4 watt 1% resistors so everything will need to be ordered. And I also would need to build a power supply for this whole Magilla.
How many boards did you order? I could practically drive over, not really, but you are so damned close. Your boards have the dual hole pattern for the caps and the mounting holes for the heatsink and are the final version OS posted? I'm not in a big hurry for whoever has them available. I still would want the latest version of the Gonad and would need to order all the parts as I don't have any E waste, just lots of 1/4 watt 1% resistors so everything will need to be ordered. And I also would need to build a power supply for this whole Magilla.
Hi Kind,
No, I believe my boards are the ones posted in Post#1210. They don't have the holes for a heatsink but they do have the dual hole sets. It may be a month before I get them. If you don't get some before, I will send you a PM when they get here. I'm sure Jason will have tested them by then so we should know if there are any problems. I ordered 10 boards. I plan to keep at least 3 pair for myself.
Blessings, Terry
No, I believe my boards are the ones posted in Post#1210. They don't have the holes for a heatsink but they do have the dual hole sets. It may be a month before I get them. If you don't get some before, I will send you a PM when they get here. I'm sure Jason will have tested them by then so we should know if there are any problems. I ordered 10 boards. I plan to keep at least 3 pair for myself.
Blessings, Terry
Even Terry asked for art a little of the finalized version being posted. To the best of my knowledge no one has ordered from the final files as yet.
The last files were posted by me and were based on OS's work with various input from OS and others.
The last files were posted by me and were based on OS's work with various input from OS and others.
Thanks Terry and Jason,
You both are faster and much more capable than anything I can do myself. Are all these boards from overseas or are there no board houses here in North America who are doing this sort of quick turnaround low volume at a decent price? I forgot what magazine I used to get that always had so many board houses that offered these services but I never had the need to use them. I am surely not going to start making my own boards that doesn't seem like something I want to do, I've played with enough chemistry in my life to not need to do that on something like this.
You both are faster and much more capable than anything I can do myself. Are all these boards from overseas or are there no board houses here in North America who are doing this sort of quick turnaround low volume at a decent price? I forgot what magazine I used to get that always had so many board houses that offered these services but I never had the need to use them. I am surely not going to start making my own boards that doesn't seem like something I want to do, I've played with enough chemistry in my life to not need to do that on something like this.
spooky/gonad at the proof stage...
Checking rail/ground traces.
Both are my last posted .asc/schema's (with "embellishments"/features).
The spook was a hairpuller like last time. SO MANY "crossovers" (+ stuff
to the - side) 😡 .
Every CM has traces - dense layout...
Now to do 150 component lables .... 😱
Without these perfect .... the OPS won't "sing" !!
OS
Checking rail/ground traces.
Both are my last posted .asc/schema's (with "embellishments"/features).
The spook was a hairpuller like last time. SO MANY "crossovers" (+ stuff
to the - side) 😡 .
Every CM has traces - dense layout...
Now to do 150 component lables .... 😱
Without these perfect .... the OPS won't "sing" !!
OS
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OS, I will use your layout as my design reference. You are very fast to make circuit design and layout. Nobody can not catch you 😀.
My progress of building 5 pairs EF3 so slow. I have difficulties to put transistors on heat sink. I hate mechanical things 😡. Anybody please give me a link that describe (tutorial) how to drill heat sink or such like this.
Now I must make so many seven segments display...
I'm not that fast ... It took me hours to get that second one - (spook).
Got so mad/frustrated that I shut down for a while ... ate
/drank something
.
I also have the last versions to help with the tough parts.
Everything gets it own ground trace on both boards ...
-regulators
-servo
-main decoupling
-lifted ground
Low/high voltage separated and NFB (curse the NFB 😀 ) separate.
Should be very quiet "lab grade" performance ....
OS
Got so mad/frustrated that I shut down for a while ... ate
/drank something
.I also have the last versions to help with the tough parts.
Everything gets it own ground trace on both boards ...
-regulators
-servo
-main decoupling
-lifted ground
Low/high voltage separated and NFB (curse the NFB 😀 ) separate.
Should be very quiet "lab grade" performance ....
OS
Ostripper,
I am so impressed with your layout skills! I've been doing this for a while and I can honestly say that your layouts are some of the best that I've seen.