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DIY For Audio
DIY Power Amplifier: PALADIN SM-150
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<blockquote data-quote="JimGore" data-source="post: 715557" data-attributes="member: 3"><p>Hi Gavin,</p><p></p><p>Thanks for your feedback!</p><p></p><p>I haven't done the layout or costing analysis yet, so the figures are heavily thumb suck at the moment. </p><p></p><p>- 70um copper, double sided PCB with silkscreen and solder mask - should be around R 450 ea depending on the size.</p><p></p><p>The parts cost will depend heavily on what components we end up using. It could be anything between around R 300 and R 1500 per board.</p><p></p><p></p><p></p><p>When driving full power with a MOSFET output stage into 4 ohm, using 4 pairs of output devices the amplifier will dissipate an average of around 14W per transistor.</p><p></p><p>14W x 8 = 112W. We will need a heatsink that allows a maximum temperature rise of 40 degrees C above ambient while dissipating this power. That calculates to a heatsink with maximum thermal resistance of around 0.36 K/W</p><p></p><p>If you have 2x of the heatsinks linked to below side by side that will do the job perfectly!</p><p></p><p><a href="http://www.mantech.co.za/ProductInfo.aspx?Item=A0M0030" target="_blank">http://www.mantech.co.za/ProductInfo.aspx?Item=A0M0030</a></p><p></p><p></p><p>Kind regards,</p><p>Ian.</p></blockquote><p></p>
[QUOTE="JimGore, post: 715557, member: 3"] Hi Gavin, Thanks for your feedback! I haven't done the layout or costing analysis yet, so the figures are heavily thumb suck at the moment. - 70um copper, double sided PCB with silkscreen and solder mask - should be around R 450 ea depending on the size. The parts cost will depend heavily on what components we end up using. It could be anything between around R 300 and R 1500 per board. When driving full power with a MOSFET output stage into 4 ohm, using 4 pairs of output devices the amplifier will dissipate an average of around 14W per transistor. 14W x 8 = 112W. We will need a heatsink that allows a maximum temperature rise of 40 degrees C above ambient while dissipating this power. That calculates to a heatsink with maximum thermal resistance of around 0.36 K/W If you have 2x of the heatsinks linked to below side by side that will do the job perfectly! [url=http://www.mantech.co.za/ProductInfo.aspx?Item=A0M0030]http://www.mantech.co.za/ProductInfo.aspx?Item=A0M0030[/url] Kind regards, Ian. [/QUOTE]
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DIY & Tutorials
DIY For Audio
DIY Power Amplifier: PALADIN SM-150
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