My F5T V3 build - Page 3

tome · 13th May 2012, 07:32 PM

Hi Buzz
Can you tell me the price for MUR diodes, I can't find it.
thanks
Tome

buzzforb · 13th May 2012, 07:47 PM

1.50$

labjr · 13th May 2012, 08:00 PM

Camping for Mother's day? That's interesting.

buzzforb · 16th May 2012, 12:35 AM

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)

dimkasta · 16th May 2012, 08:40 AM

Rickrolled

potepuh · 16th May 2012, 09:55 AM

HA

AndrewT · 16th May 2012, 02:33 PM

How well do those wide heatsinks get the Tc of the centre located devices down to manageable levels?

aptquark · 16th May 2012, 02:38 PM

camping with the fam huh...and you didnt bring the project with you? This is DIYA blasphemy!!!!!

Quote:

Originally Posted by dimkasta

Rickrolled

heh...good one

buzzforb · 16th May 2012, 03:22 PM

Quote:

Originally Posted by AndrewT

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.

AndrewT · 16th May 2012, 03:52 PM

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.

13th May 2012, 07:47 PM	#22
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	1.50$ __________________ \|F6 Kit/Trasnformer GB Sign up sheet Closed,\|Primrose GB Sign Up sheetClick Here ...Shape the sound , Man!

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
F5T Premium kit GB	buzzforb	Group Buys	583	13th June 2013 02:37 AM
GB for F5T Convertible amplifier boards	Tea-Bag	Group Buys	113	4th May 2013 03:43 AM
V3 trident	coolhead	Twisted Pear	7	14th March 2012 02:18 PM
Lepai V3 with TDA8566	Electro-Chip	Chip Amps	4	3rd January 2012 05:04 PM
LAB Subwoofer v3.0	hulkss	Subwoofers	3	23rd May 2004 08:27 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

13th May 2012, 07:32 PM	#21
tome diyAudio Member Join Date: Apr 2010 Location: Ohrid, Macedonia	Hi Buzz Can you tell me the price for MUR diodes, I can't find it. thanks Tome

13th May 2012, 08:00 PM	#23
labjr diyAudio Member Join Date: Apr 2003 Location: MA	Camping for Mother's day? That's interesting.

16th May 2012, 08:40 AM	#25
dimkasta Dimitris diyAudio Member Join Date: May 2010 Location: Athens	Rickrolled

16th May 2012, 09:55 AM	#26
potepuh diyAudio Member Join Date: Feb 2004 Location: SLOVENIA	HA

16th May 2012, 02:33 PM	#27
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	How well do those wide heatsinks get the Tc of the centre located devices down to manageable levels?

16th May 2012, 03:52 PM	#30
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	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.