I think it's the final revision of layout , I done everything was necessary /suggested ,even more with personal contribution
Regards,Alex
Yes Alex you've done all, and it is excellent job. Just one thing you don't want to change, capacitors for DC servo, C18 and C19, and I don't understand why.
Cheers, Damir
Sorry to tell you but those caps are in place , just look closer in yellow first pic, and red circle in the second pic ....
Alex
Attachments
Sorry to tell you but those caps are in place , just look closer in yellow first pic, and red circle in the second pic ....
Alex
Oh yes, I was looking the same position where you still have 5mm spacing and did not notice added caps. My apologies for that.
Now we have the PCB with all output transistors on one side and two possibility to fix it to the heat sink, perpendicular and parallel. I prefer perpendicular as in that way the PCB and electronic components are less heated from the hot heat sink, but if someone like to put it parallel it is possible now.
Thank you Alex, I still did not finish connection check, how sure you are that all is correctly connected?
regards, Damir
Hello.
Has anybody built a prototype yet?
I think here is the schematic: http://www.diyaudio.com/forums/solid-state/253039-unique-cfa-120-230w-amp-2.html#post4113328
Has anybody built a prototype yet?
I think here is the schematic: http://www.diyaudio.com/forums/solid-state/253039-unique-cfa-120-230w-amp-2.html#post4113328
It looks great
Alex made the layout for 200W version, 120W version does not have a layout yet.
I am planning to make the layout for 120W and 200W versions with ThermalTrak OPS.
Before group bay I have to make a prototype, and I am quite slow.
Hi Richard, I don't want to sell any board before I build a prototype. Problem is that I can't buy all needed part in short time, some are quite expensive, so it will take some time to do that, be patient with me.
BR Damir
In post #105, Alex has posted a double sided PCB layout, but no Gerber files. I am not sure if this was intended for iron-transfer method, but connecting every 'via' is challenging as much as aligning the top and bottom layers.
However, with some suggestions from anyone here, I offer to assemble and test the prototype, so that the Group Buy can be arranged.
If Alex can share the Gerber files, I could get a local manufacturer to produce sample boards and after testing the actual production boards. I believe the cost and quality should be comparable to the best boards from China.
However, with some suggestions from anyone here, I offer to assemble and test the prototype, so that the Group Buy can be arranged.
If Alex can share the Gerber files, I could get a local manufacturer to produce sample boards and after testing the actual production boards. I believe the cost and quality should be comparable to the best boards from China.
Dadod do you have news?
Today I received my boards for LMOSFET in TO3 cases, so now I have to check what components I am missing.
Hello dadod,
I would like to know the meaning for the loop gain plot phase starting at +90 degrees.
It seems that your circuit could use 270 degrees before reaching the gain margin point.
In #16, you posted the loop gain plot.
The plot shows that the phase starts around +40 degrees from the left, but I think it should go from +90(or -270?) degrees from the left and decrease towards the right.
I believe normal loop gain plot phase should start from 0 degree and decrease.
Is it ok?
What trick is used to do so?
And, why does normal loop gain plot phase start from 0 degree?
This depends how DC servo was connected for the LG simulation, before or after Tian probe. In this case it's connected to the amp output, if connected after Tian probe phase start from 0 degree.
When I simulated this LG I wanted to see DC servo influence on the Loop Gain.