RAS-300 Mosfet Amp. - Page 9 - diyAudio
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Old 16th October 2011, 01:16 PM   #81
masood is offline masood  India
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hi all,
can any one send me the 300w nico ras wring and image photograph.thanking you
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Old 16th October 2011, 03:26 PM   #82
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Default RAS300

Simplified 300 watt MOSAMP. I have never built it for myself, photo courtesy Gokan and Ersoy from DIYaudioTurkey.
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Old 5th December 2011, 03:48 PM   #83
masood is offline masood  India
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dear nico ras,
i am so pleased to get it now very very thanks to that you send me this valuable this 300w simplified circuit .this circuit has many mosfet .i have only two pair and in my city this type of transistor are not available.so i want such type of circuit in which that have only two pair with wiring.i salute you thanking you yours masood.
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Old 5th December 2011, 04:16 PM   #84
jaycee is offline jaycee  United Kingdom
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You want 300W from two pairs of MOSFETS ? Forget it.
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Old 5th December 2011, 09:03 PM   #85
AKSA is offline AKSA  Australia
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Try SIX pairs, Jaycee........

Hugh
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Old 10th December 2011, 12:35 PM   #86
masood is offline masood  India
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DEAR ALL,
MY THINKIKING IS TO USE THAT TRANSISTOR WHICH I HAVE.NOT MAKING HI-FI 300W AMPLIFIER.THANKS ALOT.
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Old 10th December 2011, 03:05 PM   #87
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Masood, this amp is designed for lateral Mosfets, you cannot exchange them for HEXFET or transistors, they will simply run-away because there is no Vbe multiplier. Furthermore, you cannot expect two output devices to provide 300 watt into relatively low impedance loads.

Go have a look at APEX's design. It uses conventional components which you will surely get 500W PA amplifier with Limiter
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Last edited by Nico Ras; 10th December 2011 at 03:08 PM.
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Old 8th October 2012, 09:50 AM   #88
waylene is offline waylene  South Africa
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Nico Ras where can I get your email address?
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Old 8th October 2012, 09:52 AM   #89
waylene is offline waylene  South Africa
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Default Ras r300

Problems with that amplifier. Can you assist me please?
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Old 8th October 2012, 07:52 PM   #90
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Waylene, I made some modifications to use with a 30VDC supply so that the node voltages can be measured. Compare values to those you have. Also with such low voltage you could probably use loads of an ohm or even less.

Have a look at this schematic with node voltages, they are as near dammit to the actual but easier to show on the sim. We will work through your amp stage by stage to find what went wrong -

By using X1 you can balance the off-set to near zero volts
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Last edited by Nico Ras; 8th October 2012 at 08:06 PM.
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