No, the Vgs readings in your post #40 are closer to what it should be, except they should both be equal. It was only the bias that was too high. In the provide schematic, you will see that both Vgs of the Aleph current source and the gain mosfets is 4.45V. Your values may vary but not much.
Are you now able to measure any change in voltage over the source resistors while trimming P1 and P3?
/Hugo
Are you now able to measure any change in voltage over the source resistors while trimming P1 and P3?
/Hugo
Ok. Let me open this thread again. I really needed to take a break.
First of all thanks Netlist for your work with schematic. Although I don’t understand it.
The problem is still this:
Q11 ( in my case they are two) when turning full on starts at about 4,5V but quickly goes down to 4.1V. Then I have to turn it of because I don’t want to burn anything. I have burned enough transistors already. The Q2 side stabilizes at about 4.4V.
The source resistors have 0.5V. If I understand this it should be 0.3V.
The question is: How can I stabilize Vgs at 4,4 on Q11?
I did turn up V3 to se what happens but I can't se any change.
First of all thanks Netlist for your work with schematic. Although I don’t understand it.
The problem is still this:
Q11 ( in my case they are two) when turning full on starts at about 4,5V but quickly goes down to 4.1V. Then I have to turn it of because I don’t want to burn anything. I have burned enough transistors already. The Q2 side stabilizes at about 4.4V.
The source resistors have 0.5V. If I understand this it should be 0.3V.
The question is: How can I stabilize Vgs at 4,4 on Q11?
I did turn up V3 to se what happens but I can't se any change.
Obviously, something is wrong with the one side.
I you compared all resistors with the known good side, only the BC550C of the Aleph current source or a bad connection (soldering) somewhere must be the culprit.
What is it that you don't understand on the schematic?
It shows the DC values, measured with respect to ground.
/Hugo
I you compared all resistors with the known good side, only the BC550C of the Aleph current source or a bad connection (soldering) somewhere must be the culprit.
What is it that you don't understand on the schematic?
It shows the DC values, measured with respect to ground.
/Hugo
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