I have heard that a Chinese tracers users measured 2sk135 is also same as you, but 2sk1058 on this phenomenon.
See the .CUV file for 2SK1058. Condition test as before: N-MOS; Vds Vs Id, Vds=36 V; RB=6k; RC=75
Locky,
No Vcc2 on collector of Q1 and 2. I have replaced Q2-4 and still no Vcc2 on collector of q1. I have not replaced q1, as i do not have any. You mentioned Q7 being a possibility, but I do not have a part number and it is a position that is difficult to see. Would you mind giving that to me so I can get it on the way.
No Vcc2 on collector of Q1 and 2. I have replaced Q2-4 and still no Vcc2 on collector of q1. I have not replaced q1, as i do not have any. You mentioned Q7 being a possibility, but I do not have a part number and it is a position that is difficult to see. Would you mind giving that to me so I can get it on the way.
The power supply to Vcc2 by PMOS//R20,
The Vcc2 have some voltage unless Q1-Q4 is shorted or R20 is break.
Q7 is the 'pnp',it between R48 and R50.
The Vcc2 have some voltage unless Q1-Q4 is shorted or R20 is break.
Q7 is the 'pnp',it between R48 and R50.
Locky,
i have replaced all fets. Vcc can be measured across Q2 but not Q1. Replaced Q7 with bc5xx. Still have over current lit. The base of Q7 is at supply voltage.
i have replaced all fets. Vcc can be measured across Q2 but not Q1. Replaced Q7 with bc5xx. Still have over current lit. The base of Q7 is at supply voltage.
Q2 Q3 collect connect Vcc2
Q1 Q4 collect connect GND
The over current led light, the reason may be:
1.Q7(2sa970) C-E is shorted or turned on
2.PMOS G-S is shorted.
if the Vcc2(Q2/Q3collect voltage) is near Vcc, but over-currebt led still light.this mean there are no over current.
Then you can short the portect_sw( it is near the over-currect led,but not install),the sw will short Q7 B-E,If Q7 is ok,then Q7 will cutoff, and the led will not light.
If LED still light, may PMOS G-S is short.
Q1 Q4 collect connect GND
The over current led light, the reason may be:
1.Q7(2sa970) C-E is shorted or turned on
2.PMOS G-S is shorted.
if the Vcc2(Q2/Q3collect voltage) is near Vcc, but over-currebt led still light.this mean there are no over current.
Then you can short the portect_sw( it is near the over-currect led,but not install),the sw will short Q7 B-E,If Q7 is ok,then Q7 will cutoff, and the led will not light.
If LED still light, may PMOS G-S is short.
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Locky,
I have the the tracer workinf again, but now I am getting very ragged response and cannot even measure in the same way before. Seems unstable. I replaced both the PMos and the Q7 with alternate transistors. I assumed this was not an issue due to the fact that they are not active in the actual measuring process/ Could this be causing my problems? Also, Although I have never cased it up, shold this help performance, providing a sheild from RF or other interferences?
I have the the tracer workinf again, but now I am getting very ragged response and cannot even measure in the same way before. Seems unstable. I replaced both the PMos and the Q7 with alternate transistors. I assumed this was not an issue due to the fact that they are not active in the actual measuring process/ Could this be causing my problems? Also, Although I have never cased it up, shold this help performance, providing a sheild from RF or other interferences?
Q7 and PMOS measurement does not play a role, you can even shorted PMOS D-S. But the protect will disable.
You also can short the Q1 B-E/ Q2 B-E / Q3 B-E /Q4 B-E ,then The LM358 driving the test unit direct. Q1~Q4 not play any role. But you only can measure small signal device.
In this way to see whether the system is stableand.
You also can short the Q1 B-E/ Q2 B-E / Q3 B-E /Q4 B-E ,then The LM358 driving the test unit direct. Q1~Q4 not play any role. But you only can measure small signal device.
In this way to see whether the system is stableand.
I just got one curve tracer.
I am very happy with it....it seems to work wonderfully!
I have one question: Do I need to calibrate the board? I think that once calibration file is sent along with the SW Package.
Does it mean that calibration has been already performed and I don't need to do anything else?
I also was wondering hjow to adjust change scale on the axis it seems to be a little fiddly!
I am very happy with it....it seems to work wonderfully!
I have one question: Do I need to calibrate the board? I think that once calibration file is sent along with the SW Package.
Does it mean that calibration has been already performed and I don't need to do anything else?
I also was wondering hjow to adjust change scale on the axis it seems to be a little fiddly!
I am so happy look here......🙂🙂🙂
http://www.diyaudio.com/forums/pass-labs/216616-f6-amplifier-471.html#post3539052
http://www.diyaudio.com/forums/pass-labs/216616-f6-amplifier-471.html#post3539052
Thank you kasey197!
Locky_z did a good job.....for the next version we want the heater included! At least up to the favorite temperature of Nelson's living room...55 degree Celsius!
Maybe on his birthday it could be some degrees more.....🙂😎🙂
😀😀
Locky_z did a good job.....for the next version we want the heater included! At least up to the favorite temperature of Nelson's living room...55 degree Celsius!
Maybe on his birthday it could be some degrees more.....🙂😎🙂
😀😀
I agree. You should also test out the script locky wrote to do the MOSFET characteristic curves (you know Id vs Vds at different Vgs) - I think he's posted it either here or on his yahoo user group.
Unfortunately the curve tracer doesn't seem to work very well with Windows 8 but I'm guessing an update will come out eventually that will fix the problem. I love it so I am keeping my win 7 laptop alive to run it 😉)
Unfortunately the curve tracer doesn't seem to work very well with Windows 8 but I'm guessing an update will come out eventually that will fix the problem. I love it so I am keeping my win 7 laptop alive to run it 😉)
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