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Old 24th December 2008, 12:43 PM   #61
catalin is offline catalin  Romania
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I think that 0.22 it's enough
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Old 24th December 2008, 02:13 PM   #62
AndrewT is offline AndrewT  Scotland
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Default Re values

Hi,
read Bob Cordell.
He presents a persuasive argument to show that minimum Re depends on heatsink and supply voltage.
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Old 24th December 2008, 03:02 PM   #63
catalin is offline catalin  Romania
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Totally agree .
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Old 24th December 2008, 03:48 PM   #64
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Quote:
Originally posted by catalin
I think that 0.22 it's enough
I agree. But the schematic doesn't show any emitter resistors.

Or am I looking at the wrong schematic? There are a couple of different ones in the thread.
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Old 26th December 2008, 05:08 PM   #65
Stee is offline Stee  Italy
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Default Stee Final Stage pseudo-IGBT

hello
my idea is put fet/mosfet in driver stages
for more accuracy in human voice range

also
maybe better use 10/12A final devices
because are more similar in gain
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File Type: jpg joy200mos.jpg (80.2 KB, 804 views)
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Old 26th December 2008, 05:34 PM   #66
AndrewT is offline AndrewT  Scotland
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Stee,
where are your emitter resistors?
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Old 26th December 2008, 05:56 PM   #67
Stee is offline Stee  Italy
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Default same job of before

I think need just 2Vgs biasing
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Old 29th December 2008, 09:33 AM   #68
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Default hello catalin

merry xams and a happy new year ....

i was wondering if you have a pcb for the joy 200....

in the greek forum were i originally found your schematic was there a pcb but i dont know if this is yours and also if this is the best vailable .....

if you have one id like to have the files and i am also willing to pay for this in any way
either to send you some money for the files

or to sent you some parts that may be its not possible to get in your country ....

best regards and thank you sakis
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Old 29th December 2008, 10:16 AM   #69
danzup is offline danzup  Romania
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There is a variant of PCB used by us from the romanian forum ( and realized by someone that is very active here on diyforum : alexmm ) which is ok by now but also there are some other variant ...
You can download from here :
http://www.elforum.ro/viewtopic.php?...&sd=a&start=45
as the file is larger that this forum accepted for attachments !
Scroll down and look for this :
"
SZIKLAI PCB.pdf [284.01 KiB]
ziceti daca e bun sau ce mai trebuie facut . Salutari alex mm
"
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Old 29th December 2008, 10:20 AM   #70
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Default danzap .....

thanks for your reply but i cannot understand romanian so it seems that i cannot locate where exactly that attachemnt is and also may the forum requieres registration

thanks
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