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Old 13th April 2010, 03:48 AM   #121
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Quote:
Originally Posted by klewis View Post
This is about 10% variation, I the results are from my measurement technique - had held infra-red temperature sensor, 1mv DMM range.

Ken
Hi Ken,

Are you pointing the infra-red temp sensor to the heatsink? Is the heatsink black or silver? I learned that if the object is reflective, the reading is not accurate.

Panson
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Old 13th April 2010, 09:37 AM   #122
superR is offline superR  Netherlands
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Hi Panson,
As you know I am having some difficulties sourcing the Thermaltrak parts. Therefore I want to use alternative parts until I can get my hands on those Thermaltrak parts.

In your email you suggested MJL21193/4 as alternative devices. Can you please give us some more info on that. I think many of us are currently having a hard time sourcing the Thermaltrak devices.
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Old 13th April 2010, 11:48 AM   #123
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Hi Panson,
As you know I am having some difficulties sourcing the Thermaltrak parts. Therefore I want to use alternative parts until I can get my hands on those Thermaltrak parts.

In your email you suggested MJL21193/4 as alternative devices. Can you please give us some more info on that. I think many of us are currently having a hard time sourcing the Thermaltrak devices.
Sure! I will post some info here tomorrow. My domestic helper fired us last night. It is a chaos for us, a family having two little kids.
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Old 13th April 2010, 02:49 PM   #124
klewis is offline klewis  United States
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Quote:
Originally Posted by panson_hk View Post
Hi Ken,

Are you pointing the infra-red temp sensor to the heatsink? Is the heatsink black or silver? I learned that if the object is reflective, the reading is not accurate.

Panson
Hi Panson,

Nice build!

I'm pointing it at the transistor, I put a piece of black paper covering the heat sink to avoid the reflections off the heat sink. I move the sensor slowly across the surface of the transistor until I see the highest temperature. I hold the sensor about 6 inches away from the transistor, at this distance the laser pointer and the sensor are not aligned.

Ken
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Old 14th April 2010, 10:26 AM   #125
superR is offline superR  Netherlands
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After two weeks of travelling from Hong Kong to the Netherlands the PCB's arrived! They look great! Next job is picking components which can be fit on the board and making some last efforts in order to get those NJL0302's. Anyone who can help me!? (in Europe, due to shipping time)
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Old 21st April 2010, 09:10 PM   #126
superR is offline superR  Netherlands
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It has been a while but we have a tiny update;

I just soldered it but it is too late to test/measure it so I want to show you my "skills". Please Panson, can you check my board before I put +/- 45 V on it?
Attached Images
File Type: jpg 1271875723-560.jpg (41.0 KB, 732 views)
File Type: jpg 1271875790-260.jpg (55.6 KB, 724 views)
File Type: jpg 1271875834-640.jpg (93.3 KB, 717 views)
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Old 21st April 2010, 10:52 PM   #127
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I just soldered it but it is too late to test/measure it so I want to show you my "skills". Please Panson, can you check my board before I put +/- 45 V on it?
The lighting of the last photo (Compact amp) was not right. I can't see thing clearly. Please take another photo with proper lighting. Thanks!
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Old 22nd April 2010, 07:15 AM   #128
superR is offline superR  Netherlands
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Had to wait for the sun to come up
Better lighting
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Old 22nd April 2010, 07:58 AM   #129
superR is offline superR  Netherlands
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And some more;

Back side with my ugly creation

Front side, out of focus.....
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File Type: jpg 1271914766-450.jpg (97.0 KB, 366 views)

Last edited by superR; 22nd April 2010 at 08:03 AM.
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Old 22nd April 2010, 10:03 AM   #130
AndrewT is offline AndrewT  Scotland
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this is ridiculous.
Almost 5.2MB of attachment spread over 3posts.

The system should prevent this.
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regards Andrew T.

Last edited by AndrewT; 22nd April 2010 at 10:05 AM.
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