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Old 21st March 2013, 11:56 PM   #281
labjr is offline labjr  United States
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I heard a story on CNN tonight about an American engineer who was found dead in his apartment in Singapore.

It caught my attention when they mentioned he was working on GaN research. The only other place I read about this was the last two days in this forum. I guess this this field is highly competitive and may have lead to his murder. Kind of scary.
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Old 23rd March 2013, 05:17 AM   #282
flg is offline flg  United States
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It is probably wrong for me to say, it is a cut throat bis, but, it is! I'm in it, and the people running it, and investing in it, don't give a s$%^t. Look at the money the every day average person has in thier pocket, or in their savings. Nothing! Look at the average salery for these people. No different for people in this bis! Look at the Dow Jones, flurishing like never before! Something is really wrong here! And they don't get it!
Sorry for the OT
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Old 23rd March 2013, 12:49 PM   #283
ichiban is offline ichiban  United States
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Bubble trouble
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Old 4th April 2013, 11:55 PM   #284
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Default First amp...

Well folks, I have been working on Part II of "What's the Buzz?" for so long now that I'm starting to think I'm married to it. That is probably the fate of your brides too: second fiddle to a DIY Project.

Anyway, I didn't think I could deliver anything credible on the weighty topic of load-line linearization with a SemiSouth JFET (or any transistor for that matter) without building an amplifier. Jim and I spent some time this morning checking out the single-channel F2J pictured in the attached images. We both were impressed with the listening this morning; but, that shows what lightweight audiophiles we are. We were in a noisy lab with a 60-Hz power transformer suspended from the ceiling directly behind us humming away. And we were using such a cheap speaker that I will make no further mention of the sacrilege.

But, anyway, we are taking some interesting distortion data, and for that you don't need ears of gold. Plus we're going to build the second channel and take both home for some real listening.

Hope to be posting the next installment of "What's the Buzz?" soon.
Attached Images
File Type: jpg F2J_1.jpg (77.8 KB, 307 views)
File Type: jpg F2J_2.jpg (112.1 KB, 301 views)
File Type: jpg F2J_3.jpg (200.5 KB, 304 views)
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Old 5th April 2013, 12:02 AM   #285
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Your ears are, by far, your best instrument in audio

The hanging power transformer pic would be really nice avatar
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Old 5th April 2013, 01:40 AM   #286
eyoung is offline eyoung  United States
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This just in...

I-Micronews - POWER ELECTRONICS : A new high-temperature 1200V/10A SiC MOSFET now available ...

just beggin for some class A action...

Regards,
El
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Old 5th April 2013, 01:51 AM   #287
Zen Mod is offline Zen Mod  Serbia
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Old 5th April 2013, 02:02 AM   #288
Salas is online now Salas  Greece
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CISSOID - NEPTUNE - High Temperature, High Voltage Power MOSFET 1200V
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Old 5th April 2013, 02:55 AM   #289
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Quote:
Originally Posted by buzzforb View Post
Your ears are, by far, your best instrument in audio

The hanging power transformer pic would be really nice avatar
And not only that, but the ears are the main reason to bother building in the first place, besides hanging out with you all.
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Old 5th April 2013, 08:31 AM   #290
Zen Mod is offline Zen Mod  Serbia
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just in case - I'm just asking -you boyz made it by Papa's recipe of F2J ( he posted it few times here) ?

Quote:
The F2's that I have updated with the JFETs need the
following changes:

R6 = 47k

C1 = 10 uF

Z1 removed

The potentiometer must be re-adjusted for minimum
distortion at 4.5 watts (symmetric clipping) and readjusted
after an hour.

The distortion results are typically a reduction from about 1%
at 1 watt to .25%.
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