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Old 28th November 2010, 09:59 PM   #971
sekhar is offline sekhar  India
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i am falling asleep ..................................:s leep:
here is a sneak peek of the updated pcb still a lot of work to do will update tomorrow ....................and pcb size finalized 300mm X 68 mm..... max can be a bit less......





regards
sekhar
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Old 28th November 2010, 11:12 PM   #972
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Originally Posted by sekhar View Post
i am falling asleep ..................................:s leep:
here is a sneak peek of the updated pcb still a lot of work to do will update tomorrow ....................and pcb size finalized 300mm X 68 mm..... max can be a bit less......





regards
sekhar
sekhar
wake up buddy
time to work
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Old 28th November 2010, 11:28 PM   #973
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hi apexaudio
greetings should R23 BE 680 OHMS or is 330 OHMS correct will
MJE340 MJE NEED heatsinks
thanking you
andrew lebon
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Old 28th November 2010, 11:59 PM   #974
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Quote:
Originally Posted by sekhar View Post
i am falling asleep ..................................:s leep:
here is a sneak peek of the updated pcb still a lot of work to do will update tomorrow ....................and pcb size finalized 300mm X 68 mm..... max can be a bit less......





regards
sekhar
Track mising
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Old 29th November 2010, 12:10 AM   #975
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Originally Posted by andrewlebon View Post
hi apexaudio
greetings should R23 BE 680 OHMS or is 330 OHMS correct will
MJE340 MJE NEED heatsinks
thanking you
andrew lebon
For BIAS setup R22 should be 1k2 instead 680R for triple darlington output stage, and R23 is correct 330 ohms.
Q5 (MJE340) must be on main heatsink with outputs.
Predrivers MJE340/350 can use smal heatsinks, but no need.
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Old 29th November 2010, 03:00 AM   #976
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Hi Mr. Mile

i have built B500 in bridge mode, i use 1800va transformer ,rail voltage 63+/- vdc(45ct45) . caps 6 x 10.000/100vdc. are those caps enaugh for this ?
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Old 29th November 2010, 04:23 AM   #977
sekhar is offline sekhar  India
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ok frnds so i am up good morning every one ...............................



regards
sekhar
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Old 29th November 2010, 04:37 AM   #978
sekhar is offline sekhar  India
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miles can i use the same junction marked in red for protect and reference (needed with step driver)................


regards
sekhar
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Old 29th November 2010, 05:04 AM   #979
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Stringent SOA needs in Class-AB are met with relaxed ones in Class-H.

For example, 1kW @ 2Ohms in Class-AB using 5200/1943 requires atleast 9-10Pairs with rails around +/-90V whereas only 5Pairs will do the job in Class-H if rails are split in say +/-55 & +/-95.

In a Class- AB reactive loading we have high dissipation because output device has considerable VCE + Ic across it hence heating very much, Whereas in Class-H, this VCE is quite less across the device for same output load, hence less heat and more headroom.
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Old 29th November 2010, 05:18 AM   #980
sekhar is offline sekhar  India
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so workhorse how much power do u think 12pairs of 2sc5200/1943 with rail voltage of +-140 and a 2 step driver will produce safetly


regards
sekhar
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