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RAS-300 Mosfet Amp.
RAS-300 Mosfet Amp.
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Old 6th April 2008, 03:21 PM   #61
Nico Ras is offline Nico Ras  South Africa
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Quote:
Originally posted by mat02ah


So do I.

Thomas
Hi mato2ah, it is the circuit published in an earlier posting on the first page.

Nico

BTW, I like MAT02/03 as well
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Old 8th April 2008, 10:48 AM   #62
peranders is offline peranders  Sweden
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RAS-300 Mosfet Amp.
Quote:
Originally posted by mat02ah


So do I.

Thomas
You have to follow the registration procedure for download at my homepage. One reason for this has to do with bandwidth limit.
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Old 8th December 2008, 02:24 AM   #63
lineup is offline lineup  Sweden
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this is not a bad amplifier

and like many uses 2SK1058 + 2SJ162 output

RAS-300 MOSFET Power Amp

Thanks
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Old 8th December 2008, 03:06 PM   #64
Nico Ras is offline Nico Ras  South Africa
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Quote:
Originally posted by lineup
this is not a bad amplifier

and like many uses 2SK1058 + 2SJ162 output

RAS-300 MOSFET Power Amp

Thanks
Hi Lineup

this is not a 300 watt amp by a long shot. The web that you referring to hi-jack some text and my circuit from my web-pages. I have asked them to remove it but this is to no avail.

The amp that you see there would be good for between 100 -130 watt. To achieve higher power ratings the transistors have to br changed to MJE340/350 and MPSA42/92. Also double up on the MOSFETs then you can run at 65V
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Old 8th December 2008, 03:32 PM   #65
Nico Ras is offline Nico Ras  South Africa
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Apologies Lineup, I see now that they have published the right amplifier.

Previously they had the 100 watt single pair output. With The MPSA06/56 and BD139/140 the supply should not be higher than about +-55V to keep on the safe side.

Under the above conditions the amp will provide you with about 156 watt rms into 8 ohms and about 240 watt into 4 ohms.

Many has been built and I have not had any comments that it sounded or performed badly. I have since improved the design adding a CCS and current mirror. Although it has improved measured specs, I cannot say that it improved what it sounded like.

This amp as I understand from some constructors can take punishment used in sound reinforcement systems (clubs in other words).
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Old 11th December 2008, 08:15 PM   #66
Nico Ras is offline Nico Ras  South Africa
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Quote:
Originally posted by lineup
this is not a bad amplifier

and like many uses 2SK1058 + 2SJ162 output

RAS-300 MOSFET Power Amp

Thanks
Hi Lineup,

e-mail me and I will send you the real thing for comment. I would like to hear what you say.

Kindest regards

Nico
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Old 22nd December 2008, 07:50 PM   #67
zerohead_ak47 is offline zerohead_ak47  Turkey
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my version ras
Attached Files
File Type: pdf ras100mymod.pdf (11.1 KB, 453 views)
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Old 22nd December 2008, 09:09 PM   #68
lineup is offline lineup  Sweden
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Quote:
Originally posted by Nico Ras
Hi Lineup
this is not a 300 watt amp by a long shot. The web that you referring to hi-jack some text and my circuit from my web-pages. I have asked them to remove it but this is to no avail.
I am sorry about they fool us.
Did not know it was stolen stuff from your website.
-------------------

Better go directly to your website to get good info.
http://www.digisec.co.za/ras/

This MOSFET AMP is one version for >100 Watt:

Click the image to open in full size.
http://www.digisec.co.za/ras/ras250/ras250.html
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Old 22nd December 2008, 09:35 PM   #69
ostripper is offline ostripper  United States
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I don't think anybody "rips off" any designs around here..,
we only "Port" them.

As far as this design goes.. 12 years ago..

Click the image to open in full size.

HH (UK)was (almost) the first with this topology (hitachi app notes ,late 80's)

With 5 PAIRS this particular amp was only rated at 300/8R -
600/4R.. so the earlier "ripoff " seems to be far from accurate.
OS
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Old 22nd December 2008, 10:04 PM   #70
lineup is offline lineup  Sweden
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Yes, that one & similar has been around very long.
Often with Hitachi 2SK134 / 2SJ49 series for output.

See this topic and my attachment
http://www.diyaudio.com/forums/showt...79#post1098779


Good old MOSFET lateral 2SK134 / 2SJ49 Amplifier:
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File Type: jpg lateralmosfet1991.jpg (76.2 KB, 517 views)
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