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Old 27th February 2012, 01:11 PM   #41
expert in tautology
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More complex?

The circuit is complex.

What are a few inverters and a dual polarity power supply? Not much compared to the entire range of your project! Look at the PCB, it is complex now!

Why not build one that does the work?

There is a phrase to describe it: "false economy".
This means that while trying to make something cheaper, or save money, you make it more difficult, expensive and save nothing, make it cost more.

Just my opinion.

If your board + software would do the tasks I would buy one.

_-_-bear
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Old 27th February 2012, 02:42 PM   #42
locky_z is offline locky_z  China
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You can try to design a curve tracer circuit use dual power supply ,
and compare with my circuit, who used the opamp and relay more.
If your ADC and DAC is unipolar,you need more opamp.


My circuit to understand is complex, But it is clever.
May the base drive part of the complex, but it realizes the constant current, constant voltage, and the isolation measurement,
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Old 27th February 2012, 02:53 PM   #43
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locky, not so clever if it does not do things that a curve tracer needs to do?

So what, more opamp? Opamp is cheap. Opamp with power/current follower (circuit) is cheap.

Ok, so I looked, your unit will not do what i need, so I can not buy. Sorry.
Will look again when 4.0 comes?


Thanks

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Old 28th February 2012, 05:28 PM   #44
mos57 is offline mos57  Italy
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Quote:
Originally Posted by locky_z View Post
You load 'PNP Vce-Ic' condition
and plug PNP in slot, Base insert B,Collect into C,Emitter into E,
and press 'GO!' button.

JFET is the same,load 'measure continue' and plug Gird into B,Source into E,Drain into C.
Yes this is what i have done, but pheraps is it important the order?
First i have placed the device into the socket and then i have selected the "PNP Vce-Ic" condition.

But at the last, i not understand well how this happens, now the curve tracer trace also the PNP Bjt and Jfet curves.
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Old 28th February 2012, 10:51 PM   #45
locky_z is offline locky_z  China
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Your order is ok.

If the DTU pin is wrong, wrong position; It draw also wrong,
Please use a multimeter to check your DTU pin(Don't use 'DTU Auto Detect' function,because it may be misleading).
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Old 7th May 2012, 05:27 AM   #46
locky_z is offline locky_z  China
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Intelligent curve tracer on ebay
locky_z's Intelligent curve tracer | eBay
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Old 11th July 2012, 09:27 AM   #47
locky_z is offline locky_z  China
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The software update
http://www.diyaudio.com/forums/attac...1&d=1341998408

It support script control,
Example use script to measure a cluster of Vce-Ic.

Click the image to open in full size.
The script is

V0=2.5
mode i
setrc 0
Eout V0
startwatch
color=random(999999)
for i=2 to 10
setib i
notice "IB=",i
for j=0 to 72
cout j/2+V0
waitrelay
getadc 2
ic=1000*vrc/currentRc
ib=1000*vrb/currentrb
curvepoint str(i),vce,ic,ib,ve
next
endcurve str(i),color
cout v0
next
d=stopwatch()
notice "time:",d
end


Ib from 2mA to 10mA,9 curve ,and spend time 6.9s
Attached Images
File Type: png psb.png (102.6 KB, 919 views)
Attached Files
File Type: zip ads7871_script.zip (870.7 KB, 124 views)
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Old 13th July 2012, 12:42 AM   #48
locky_z is offline locky_z  China
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Update 2012.7.13
Bug fix:
1.if use negative parameter in setIb ,It have error.
2.add initialization currentRB,currentRC variables when press ‘run' button.
Attached Files
File Type: zip ads7871_script.zip (872.0 KB, 82 views)
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Old 9th September 2012, 10:59 PM   #49
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Quote:
Originally Posted by locky_z View Post
Most Tube is like N type J-FET in normal voltage, but if work in low voltage,Tube like some BJT.

I had used CT3 to test some Tube in low Cathode-Anode voltage.
but under low Cathode-Anode voltage,Even if the gate voltage is 0, Most tube have no anode current.
you must give gate positive voltage,the tube will have some current,and the Gate current almost equal anode current.



Because High voltage and No P Type ,So this Intelligent Curve Tracer circuit not suit Tube test.
I plan designed another circuit to test Tube,Of course It will be considered to A2 and AB2 state, and measure the Anode current ,gate current and screen grid current.
Any news on the tube curve tracer, looking forward to your new design.

Jaz
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Old 19th October 2012, 07:19 PM   #50
Orion33 is offline Orion33  Russian Federation
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locky_z

I have recieved tracer today. Thanks!
When I press "Go!", at the graph is obtained one point. In what may be problem?
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