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Old 16th March 2013, 02:54 AM   #1971
6L6 is offline 6L6  United States
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Haven't gotten to F6 yet.

F5T boards available soon.

Last edited by 6L6; 16th March 2013 at 03:00 AM.
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Old 16th March 2013, 05:17 AM   #1972
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Quote:
Originally Posted by buzzforb View Post
Threads can get tedious. I tend to be a big part of that. Then again, if it was all just facts and figures, it would be boring. You can always start s new thread with any questions you have. Welcome.
Theres alot of truth to that post, but if it wasn't for your help, along with others. We wouldn't get the help needed, we just have to learn or understand what the heck your saying half the time(or maybe thats that Zen fellow who claims his papa is smarter then mine).

Just having fun guys, I enjoy reading your very informative post.
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Old 16th March 2013, 04:34 PM   #1973
WalterW is offline WalterW  Netherlands
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Chassis is almost ready... just waiting for the frontpanel from Andrea in Italy
I made a little sub-chassis for the heavy transformers and want to put the rectifying bridges (16 diodes) beneath it. So the 'noisy' BYW99 diodes and ugly 50 Hz cabling are shielded and out of sight.
Do you think the subchassis will hold the dissipation of these diodes ? Or will it become too hot?
A little math: P=UxI, so 0.7 volts x 2,5 Amp per diode = 1.75W x 16= 28 Watts...thats a lot of rectifying heat!
Or is my calculation wrong?

The Teabag amp boards and capacitor boards will be mounted on the heatsinks.
At last I can start with the electronics....although the chassisbuilding was nice also
Should I make the backpanel black too??? I'm in doubt.

Thanks for EUVL whose chassis in the F5X thread was my reference...
Attached Images
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File Type: jpg diodes beneath transformer-chassis.jpg (231.3 KB, 243 views)
File Type: jpg transformer-chassis in case.jpg (245.6 KB, 246 views)
File Type: jpg spray-painted.jpg (169.5 KB, 234 views)
File Type: jpg chassis-side.jpg (253.7 KB, 225 views)
File Type: jpg chassis in chassis.jpg (264.8 KB, 93 views)
File Type: jpg side-sinks.jpg (215.9 KB, 84 views)
File Type: jpg chassis ready back.jpg (236.9 KB, 79 views)
File Type: jpg chassis waiting for frontpanel.jpg (244.8 KB, 87 views)
File Type: jpg should I make back black too.jpg (292.5 KB, 106 views)
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Last edited by WalterW; 16th March 2013 at 04:36 PM.
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Old 16th March 2013, 04:52 PM   #1974
Zen Mod is offline Zen Mod  Serbia
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yo half Dutchie



which diodes you're going to use ?


how many channels per chassis and what's Iq per channel and how many Graetzs per channel ?
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Old 16th March 2013, 04:56 PM   #1975
WalterW is offline WalterW  Netherlands
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The ones from Jacco: BYW99-W200 from ST.
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Old 16th March 2013, 05:01 PM   #1976
Zen Mod is offline Zen Mod  Serbia
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aaaargh ...... Dutch Connection

lookielookie : http://pdf1.alldatasheet.com/datashe.../datasheet.pdf

rest of questions ?
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Old 16th March 2013, 05:06 PM   #1977
WalterW is offline WalterW  Netherlands
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Teabag F5T convertible boards, stereo dual mono setup. With two 2sj201 and two 2sk1530 per channel which i want to bias a bit higher around 1.25A per MOSFET. So with 32 volt around 40 Watt dissipation each.
These MOSFETS are so big and the heatsinks also, so I think they will hold...
total of 160 Watt per heatsink, but if it's getting too hot, I give them around 1 Ampere bias.
Graetzs? ah Google is my best friend... one rectifying bridge a rail (4 diodes/rail) so 16 Graetzs
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Old 16th March 2013, 05:08 PM   #1978
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by WalterW View Post
........... Or will it become too hot?
A little math: P=UxI, so 0.7 volts x 2,5 Amp per diode = 1.75W x 16= 28 Watts...thats a lot of rectifying heat!
Or is my calculation wrong?..........
16 diodes for two channels seems like four power rails each with four diodes. That can only come about by having a bridge rectifier on each of four secondaries.

Now look at a secondary with a bridge rectifier.
One pair of series rectifiers passes current in one direction. The other pair of rectifiers passes current when the AC phase is reversed. That means the rectifiers operate @ 50% duty cycle.
Apply 50% duty cycle to your 28W for an effective 14W when the diodes are passing 2.5Arms to the smoothing caps.

Q: what is the rms current charging the smoothing capacitors?

If you were to adopt a single bridge on a pair of secondaries you could reduce the heat losses in the remaining eight rectifier diodes to just 7W.
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Last edited by AndrewT; 16th March 2013 at 05:14 PM.
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Old 16th March 2013, 05:11 PM   #1979
WalterW is offline WalterW  Netherlands
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Yep, Dutch connection
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Old 16th March 2013, 05:21 PM   #1980
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Quote:
Originally Posted by WalterW View Post
Or is my calculation wrong?
Yep, very.

Short pulses, higher Vf, but much higher dVxdI product per dissipated diode W.
Not 2.5A continuous per diode.
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