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Old 13th May 2012, 07:32 PM   #21
tome is offline tome  Macedonia
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Hi Buzz
Can you tell me the price for MUR diodes, I can't find it.
thanks
Tome
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Old 13th May 2012, 07:47 PM   #22
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1.50$
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Old 13th May 2012, 08:00 PM   #23
labjr is offline labjr  United States
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Camping for Mother's day? That's interesting.
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Old 16th May 2012, 12:35 AM   #24
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Much needed few days of vacation. For those who have not seen them, here are some pics of stage one of the build. As you can see, I have chosen two different methods of heat-sinking the diodes. At this point, I see no reason for heavy heat-sinking for the diodes. With just a single pair of fets, with 400mV across Rs, I have Ipk at 1.6A. Playing as loud as I can stand on my bookshelf FR units, the diodes that are freestanding barely get above room temperature. The diodes mounted to the heat-sink measure about 10 degrees warmer and i don't notice any real difference in sound from one channel to the next. I am going to try to get some working measurements this weekend, but we will see. At the very least, I will put an O-scope on the amp and watch what happens on both output and across diodes. I may get some distortion test, but I am working with a recently purchased emu 0404, that seems to be temperamental with Windows 7. May have to get a different card. I also hope to get the second pair of fets mounted and once again listen and measure. Tonight it was a Mini AJ vs. F5T V3 battle. I must admit, its fun having a Firstwatt Toe to Toe. More on that later.





Oh, one more thing. ZM, has treat for Greedy BOYZ like me.....again. (p.s. - PDF)
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Old 16th May 2012, 08:40 AM   #25
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Old 16th May 2012, 09:55 AM   #26
potepuh is offline potepuh  Slovenia
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HA
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Old 16th May 2012, 02:33 PM   #27
AndrewT is offline AndrewT  Scotland
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How well do those wide heatsinks get the Tc of the centre located devices down to manageable levels?
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Old 16th May 2012, 02:38 PM   #28
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camping with the fam huh...and you didnt bring the project with you? This is DIYA blasphemy!!!!!


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heh...good one
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Old 16th May 2012, 03:22 PM   #29
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How well do those wide heatsinks get the Tc of the centre located devices down to manageable levels?
I am sorry, but i don't understand the question. The main 4" x 10" heatsinks run at about 42C measured directly above the fet. In another project I have had a BA output stage mounted on them using same rail voltage, with Ipk per sink at 3A. At this level, you are getting into the 50-55C range. Back Ipk down to 2.5 and you are safely within 50C.
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Old 16th May 2012, 03:52 PM   #30
AndrewT is offline AndrewT  Scotland
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Looking at the pic, it seemed to me that much of the sink will run quite cool and this could leave the device Tc getting unmanageably high. But maybe I am wrong.
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