Give us the pdf for home etching.🙂OK, here comes the layout...
8.5 x 3 inch, double-sided. Not really simple any more 🙂
However - still pretty cool 😉
Placing the order tomorrow... takes about a week to produce.
And then we'll see...
P.S. Big ones are actually under the board - 3D renderer just can't show them the right way 🙂 Anyway, gives an impression.
PDFs
Hi Thimios,
Here go the PDFs in the following order:
1) Top traces;
2) Bottom traces;
3) Top silk.
I did not mirror anything, so let me know is you need more "views" 😉
Cheers,
Valery
Hi Thimios,
Here go the PDFs in the following order:
1) Top traces;
2) Bottom traces;
3) Top silk.
I did not mirror anything, so let me know is you need more "views" 😉
Cheers,
Valery
Ok i believe that is all i need,just post the schematic according to this.🙂
PS is this according to post#21?
Thanks again.
Thimios.
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Is this one safe to run at a little higher voltage rails or is 52 around it's limit? Looks like a fun project!
No, it's not the limit - I will actually run it at around 52-56 (got a couple of 1KW transformers 😉), but it can be higher.
Let me know, how much you need - I will check if some adjustments are needed.
I have a 63 volt supply to test with. I might make up a lower voltage one but I prefer higher voltage amps.
Just a suggestion here but you've got a wonderful protection system designed. Ever thought of adding a couple pads to connect your overcurrent sensing?😉
Just a suggestion here but you've got a wonderful protection system designed. Ever thought of adding a couple pads to connect your overcurrent sensing?😉
OK, just checked the parameters, for 63V rails:
R5, R8 = 63K
R38, R39 = 8.2K
All the rest is perfectly fine - no adjustments required.
Overcurrrent sensing - you're right, however, the PCB is rather packed. In a few other designs I just soldered a 2-pin plug right on top of the big resistors 🙂
Although, I will think where to place it in the refined version of the PCB...
R5, R8 = 63K
R38, R39 = 8.2K
All the rest is perfectly fine - no adjustments required.
Overcurrrent sensing - you're right, however, the PCB is rather packed. In a few other designs I just soldered a 2-pin plug right on top of the big resistors 🙂
Although, I will think where to place it in the refined version of the PCB...
Thimios, wait! Jeff's question has inspired one good idea 🙂 I wanted to avoid CCSs for the input pair, but using them will make the amp more tolerant to the rails variation / fluctuation. I have found an elegant way of implementing them.
Schematic and PCB will be slightly updated! 😉
Schematic and PCB will be slightly updated! 😉
Just a very little bit less (6 parts added). But now it's virtually rail voltage independent 😉
At least in the range +/-45V to +/-70V no adjustments required.
It's also more tolerant to rail "sagging" caused by high power consumption or mains fluctuations
At least in the range +/-45V to +/-70V no adjustments required.
It's also more tolerant to rail "sagging" caused by high power consumption or mains fluctuations
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Version 02
Here goes v02.
I have also added the "BIAS" plug for overcurrent sensor - in the middle of PCB. Size is the same, just "cleaned up" some space 🙂
Have fun!
Here goes v02.
I have also added the "BIAS" plug for overcurrent sensor - in the middle of PCB. Size is the same, just "cleaned up" some space 🙂
Have fun!
Attachments
Hi Jeff,
I have just received the PCBs - 3 minutes ago 🙂 I believe I will be the first to try 😉
Cheers,
Valery
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