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Old 4th December 2011, 02:17 PM   #1831
masood is offline masood  India
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dear all mogrel reader,
i want pcb and details of power amplifier using transistor 2sk1058 and 2sj162.my email is khan.shahid251@gmail.com i want to construct on the of new year.thanks and gretings to all.your ever masood alvi
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Old 4th December 2011, 06:07 PM   #1832
jaycee is offline jaycee  United Kingdom
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The amp in this thread is not a mosfet design. Plenty of schematics around using the parts you mention. No free lunch - it's called *DIY* audio.
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Old 15th March 2012, 05:05 PM   #1833
44250 is offline 44250  Serbia
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Finally the last page...

nikko (The MONGREL (supersym II) post #1287) has given me a pcb of SymAsym a few years ago,and told me that this would be logical next step. Recently i have re-done a SymAsym case and i am listening it right now. I have another case with 1kVA transformer with 2 x 35Vac,heatsinks and 4x20 000uF in PSU and some parts. I have asked nikko for files but he had some troubles with his computer,his hard-disc collapsed so i decided to search for a whole thread to find needed files. So i started with page one,have read a lot of things i don´t quite understand (i´m a beginer and practically just assembler,but anyway i cought some guidelines "how and why" ) and on page 181 post #1808/1809 found all i need-thanks to repeet!

OS did a great job here,he shared each step he did with the readers,fought out on his own with all opsticles that were before him and unselfishly shared numerouse files and experiences with all of us. THANK YOU SO MUCH OS!

One question for a start-i have two pairs of MJE21193/MJE21194,can i use them as output transistors? Also i have two pairs of 2SA1943/2SC5200,wich (if any) would be better replacement?


Here are some pictures of SymAsym,and hope soon there will be some pistures of a PB120N.
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Old 15th March 2012, 05:21 PM   #1834
m2003br is offline m2003br  Brazil
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Dear Borina,

2SC5200/A1943 are better than MJE21193/MJE21194 in matter of ft and beta linearity, by a large margin, wich, for me, are more important than few more watts of dissipation allowed by Motorolas.
Maybe another ones have a different opinion.

Regards,
Marcos
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Old 15th March 2012, 07:06 PM   #1835
44250 is offline 44250  Serbia
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Quote:
Originally Posted by m2003br View Post
Dear Borina,

2SC5200/A1943 are better than MJE21193/MJE21194 in matter of ft and beta linearity, by a large margin, wich, for me, are more important than few more watts of dissipation allowed by Motorolas.
Maybe another ones have a different opinion.

Regards,
Marcos
He he,my name is Aleksandar(that is how it is written in my language) ,the links under my posts are to FB-profile and FB-page wich are dedicated to boraomega´s designes (dr.Borivoje Jagodić) so that is how is the profile named "Borina Pred Pojačala" or in english- "Bora´s Pre Amplifiers". All the albums are sorted by specific designes.

Thank you for your answer i will post pictures as i do some progress...
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Old 21st March 2012, 10:59 AM   #1836
44250 is offline 44250  Serbia
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I have a few questions about CX 1.3 VB-U

The emitors and collectors of Q3 and Q4 on layout have switched their places comparing to a schematics.

1;On schematics the emitter of Q3 goes to a collector of a Q1,and by layout the collector of Q3 goes to collector of a Q1.

2;On schematics the emitter of Q4 goes to a collector of a Q2,and by layout the collector of Q3 goes to collector ofa a Q2.

3; R8 exists on a layout and picture of finnished pcb but there is no R8 on a schematics.

4; Also,places of R16 and R17 are switched.

Could anybody please help me about this...
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File Type: gif CX1.3VB-U_schematic.GIF (66.2 KB, 352 views)
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Old 22nd March 2012, 01:02 PM   #1837
44250 is offline 44250  Serbia
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I could really use some help about previous doubts...please...
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Old 22nd March 2012, 02:54 PM   #1838
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First thing I would check is transistor numbers and pinout for these transistors.
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Old 22nd March 2012, 06:04 PM   #1839
44250 is offline 44250  Serbia
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Quote:
Originally Posted by audiofan View Post
First thing I would check is transistor numbers and pinout for these transistors.
I have done that,and pinout of transistors are correct as they are on right down square of a schematic. Same thing is in VRT,so the pinout for him self is ok.
The pinout on a pcb is not,and I think that the pins E and C should switch places.

The resistors R16 and R17 should switch places too,and judging about a text that says "12/15V zener optional for R17" the value of R17 should be 15kOhm because in series with 56kOhm and about 50Vdc supply the voltage on the base of Q3 and Q4 would be 12Vdc.

R8 is one thing more,i can´t find it on a schematic and it exists on layout and even on a picture of a finished pcb. I am a beginner in these things and my questions are maybe nonsense but i´d say this time i´m right...

Thanks for your interesting here! (and sorry for my not so good english...)
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Old 24th March 2012, 11:58 AM   #1840
44250 is offline 44250  Serbia
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This is what i did up till now,and now it will wait for some better times...
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