if my mind serve well there is a wrong in the potentiometer connection
What is correct schematic or pcb?
What is correct schematic or pcb?
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No it should be like this, just P1 and P2 interchanged positions on the schematic.
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ALTERNATIVE PARTS
Is it ok using IRF830 instead of DN2540?
I haven't any 500R multiturn,can i use 1K?
In position 1N4248 what other?
Is it ok using IRF830 instead of DN2540?
I haven't any 500R multiturn,can i use 1K?
In position 1N4248 what other?
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No irf830 can not be used. It's depletion.. For the diode, there are lots of possible replacements, but the one used is very much a standard part and very easy to source.
Don't see any issues with a other pot. Just change ten input impedance to match. However in my expirence higher impedance also results in higher noise.
Don't see any issues with a other pot. Just change ten input impedance to match. However in my expirence higher impedance also results in higher noise.
AS MiiB said DN2540 is depletion mode mosfet and IRF830 is enhanced mode.
You can use 1k trimpot and 1N4248 is a type failure, should say 1N4148.
Vgs/Rsource. Only issue is that the part is not so consistent, and thus the R needed for a certain current varies a bit. I normally have two parallel resistors, as to be able to adjust the value to suit.
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No, it is set to about twice the GainWire supply current, means between 90 mA and 120 mA.
Yes. As I showed different output stage current(higher current for low impedance headphones) you choose the CCS current according to this.
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