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Old 5th January 2004, 11:05 AM   #1
Boris_7 is offline Boris_7  Russian Federation
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Location: Moscow
Default Greening a Classic 2.

Hi All!
About 16 mohths ago I did B7 AMPLIFIER (B7_AMP.zip). Output devices
in class AB at 50ma each.

Now I am planing to do somthing like B7_MOS_AMP.zip. Output devices
at 500 ma each.

Any comments?
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Old 5th January 2004, 11:37 AM   #2
Boris_7 is offline Boris_7  Russian Federation
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schematics
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Old 7th October 2006, 04:44 AM   #3
lineup is offline lineup  Sweden
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Default Boris MOSFET 2SK1058 2SJ201 Class A

Quote:
Originally posted by Boris_7

Now I am planing to do somthing like B7_MOS_AMP.zip. Output devices
at 500 ma each.

Any comments?
Your first version, Class AB bias at 50 mA/device, used Toshiba two parallelled 2SC2922 / 2SA1216 output.


I find your amplifier, new MOSFET Class A is a rather good one.
At least what I can see from your paper.
Bias is in Class A, 500mA/device = Total 1 ampere.
Will give teoretically close to 16 watt RMS ( +12dB SPL ) in true Class A output.

B7_MOS is not too complicated and still not too simplified to give problems.
Correctional small trim caps filters has been added to improve overall performance.

My Thinking:
I would like to increase the current ( 6-7 mA ) in VAS stage considerably.
From this follows,
that for input stage I would increase to at least 2.5 mA or more per transistor
to better handle the control av VAS stage.



Your choice of transistors in input, 2SC2240
and for output, 2SK1058 / 2SJ201 are completely in my liking.
About the other transistors I do not know much,
but I am sure they will do the job.

Not every time at this board, we see people submit
such basically good amplifiers.
Hurray! For Russian DIYaudio.

I attach an unzipped schematic of your amplifier, Boris_7

Regards to Moscow
from
lineup
http://lineup.awardspace.com/
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