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Old 17th August 2013, 08:49 PM   #121
dsdjoy is offline dsdjoy  Germany
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Default Temperature controlled curve tracing

Hi,

wanted to measure my transistors at operating temperature of my class-A amp. I found a way to do this and thought I share it here. May it be useful for others

Pictures speak for themselves....

1.JPG

2.jpg

3.jpg

4.jpg

You need:

- An aluminum strip, and transistor (isolated) attached to it.
- Digital thermometer attached to aluminum strip (probe close to transistor)
- electric iron (or similar)


What needs to be determined:

I noticed from other temp measurements in real amps- where the transistors are heating up the heat sinks: When heat sinks have 50 Degree Celsius, the transistors can have 70-80 Degrees Celsius.

If you are heating the heat sinks, to simulate such temperatures of transistors, you need to take that into account.

-Oliver

Last edited by dsdjoy; 17th August 2013 at 09:11 PM.
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Old 17th August 2013, 08:58 PM   #122
generg is offline generg  Germany
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Perfect Oliver....!
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and the First Wtt is......a really First Class PSS Idea
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Old 18th August 2013, 12:57 AM   #123
locky_z is offline locky_z  China
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I suggest use PTC heating a small aluminum,
The PTC is constant temperature. it can be detached from the 'USB Tea Coffee Cup Warmer Heating Pad'.
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Old 24th May 2014, 07:54 PM   #124
Orion33 is offline Orion33  Russian Federation
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Hi, Locky. My tracer stopped working. I used it last time 2 years ago - everything was right. Now turn on the JFET, load old preset, click start... Relay clicks once on and off, and on only one point of the curve with coordinates 0,I(0). What shall I do?
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Old 25th May 2014, 06:55 AM   #125
locky_z is offline locky_z  China
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In the yahoo group, I had put the newest hardware and trouble manual.
Follow the section "Curve Tracer Diagnosis" to check.
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Old 25th May 2014, 08:05 AM   #126
Orion33 is offline Orion33  Russian Federation
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I don't know what is yahoo group... Why do not you post them here?
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Old 25th May 2014, 12:38 PM   #127
locky_z is offline locky_z  China
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uk.dir.groups.yahoo.com/group/CurveTracer/
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Old 25th May 2014, 01:56 PM   #128
Orion33 is offline Orion33  Russian Federation
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I can't download
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Old 26th May 2014, 02:05 PM   #129
locky_z is offline locky_z  China
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The newest hardware manual
Attached Files
File Type: pdf Curve Tracer hardware manual.pdf (424.7 KB, 52 views)
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Old 26th May 2014, 05:39 PM   #130
Orion33 is offline Orion33  Russian Federation
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Thanks, Locky. I have checked, all works as described in "Curve Tracer Diagnostic". But I can't measure anything...
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