| audio-gd |
The idea is form Xccuphase A-100. But I had change it.
Sorry for my English. |
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| Rudy |
after a fast look at it
the input for the servo needs to be before the relais output and before the coil, and the servo doesnt work like this, the feedback needs to be the capacitor and not the resistor, swap them
why the 42V ac when you can simply use 12V AC and place them uppon the main power supply
edit : you should also use an other opamp instead off the "audiograde" one, it needs to be a low offset opamp.
Rudy |
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| audio-gd |
The servo feedback in the board is as your say,But I protract it's wrong.
Use the 42V AC I think it can work more well,
"edit : you should also use an other opamp instead off the "audiograde" one, it needs to be a low offset opamp."
Can you give me a advice?
Thanks you again |
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| peranders |
| The servo opamp can be any good JFET audio opamp, such as OPA134, AD8610, OPA627 and many many more. Offset voltage is rather unimportant. Input bias currents are more important. |
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| audio-gd |
I have test this , when use OPA2132 is best.
I design the servo opamp is dual opamps ,because I have more this IC to change.
Sorry for my English again. |
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| audio-gd |
| It's soon to complete! |
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| m0tion |
| Wow, those are really nice looking. |
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| carlmart |
| quote: | Originally posted by audio-gd
It's soon to complete! |
Is this amp based on the Xccuphase A-100 circuit? What did you change?
Where did you have the pcb made?
Carlos |
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| audio-gd |
The Xccuphase A-100 has a diamond diff VAS stage,and my amp have use this type.
But I don't need the balance input, and I difficulty to partnership the MOSFET ,so I use the SC5200/SA1943, but in the pcb I have predispose the place of MOSFET .
This pcb is my design,and made in China. |
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| peranders |
audio-gd, your pcb looks real good. :up: :nod:
Do you have any more close-ups? |
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| audio-gd |
| But my camera is too bad. So the picture is too cloudily . |
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