Increasing R1 is likely why there was more noise. This is one application that calls for a more specific circuit.
thanks. just an fyi both of those seem to be end of life also. though I found the 1837 at digikey.
Hello, I followed this thread a long time. Interesting concept. After so many circuits, which one is to choose, which is the final design? On keantoken´s page some details are not shown. The 2SC5171/2SA1930 is still available at the ebay store diy-audio4you, at least here in Germany.
Does anybody have a proper pcb layout from the latest design for my inspiration? I like to make my own to learn these things (Target program)......
Does anybody have a proper pcb layout from the latest design for my inspiration? I like to make my own to learn these things (Target program)......
R1 should be 150 for that, otherwise Q2 would never turn on. Also there is a risk of oscillation. I think BC560C will work, but be cautious.
Thank you Kean, now it looks very simple, with maximum effect. Neat!
Does someone have a layout for the pcb, single sided, as a drawing or picture, to learn from?
Does someone have a layout for the pcb, single sided, as a drawing or picture, to learn from?
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My boards aren't necessarily good to learn from because of the ground plane.
These boards are flawed, but they may give you an idea.
DirtyPCBs.com
Take note of the patch I described below. The connections on the board are correct, but in the wrong order in such a way that parasitics cause oscillation.
These boards are flawed, but they may give you an idea.
DirtyPCBs.com
Take note of the patch I described below. The connections on the board are correct, but in the wrong order in such a way that parasitics cause oscillation.
Thank you Kean
I am planning to use the high voltage version as ripple killer for the front end of my power amp.
It will feed the IPS and VAS because I am not sure if it can also be used to feed the driver stage.
The IPS plus VAS run at 16mA so I added a shunt resistor in the output of the kmult just to increase current pull to 40mA.... Is there a better way to do it ?
I am planning to use the high voltage version as ripple killer for the front end of my power amp.
It will feed the IPS and VAS because I am not sure if it can also be used to feed the driver stage.
The IPS plus VAS run at 16mA so I added a shunt resistor in the output of the kmult just to increase current pull to 40mA.... Is there a better way to do it ?
I think that should be fine. For this amp there should be no problem running the drivers from the KM.
Thank you Kean
Would you elaborate on this ?
Why, in this amp you state there should be no problem feeding the drivers with the KM ?
Are there any issues if I try to use the KM feeding the drivers of a differnt kind of power amp ? Example, would it be suitable even if the output stage was not made with laterals ?
The drivers are not really loaded by MOSFET gates, so there will not be much current demanded from the KMs. For a BJT output amp the situation could be different.