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DIY & Tutorials
DIY For Audio
Showcase - DIY LM3886 100W+ bridge/parallel build
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<blockquote data-quote="meshsmith" data-source="post: 889833" data-attributes="member: 15646"><p><strong>Update 09/11/2018</strong></p><p></p><p>Right, redesigned the power supply. Here's a little step-by-step for a single supply - each channel gets a dedicated board:</p><p></p><p><img src="https://i.imgur.com/PI3AH22.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Started with the smaller caps, resistors and SMD status LEDs:</p><p></p><p><img src="https://i.imgur.com/txNoDZs.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Then on to the (huge) caps (24700uf per rail = 49400uf per board = 98800uf for the amplifier. Ouch!):</p><p></p><p><img src="https://i.imgur.com/AhR9RIp.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Finally prepping the diodes. They won't get very hot, so I let two diodes share a single tower heatsink, using some SilPads which I cut for insulation:</p><p></p><p><img src="https://i.imgur.com/a6dCWaX.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Final PSU:</p><p></p><p><img src="https://i.imgur.com/OZHKZ7t.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Testing will be done this weekend. It will no doubt require a soft-start circuit to prevent it popping fuses like it ain't a thang, so will build one of those as well and test it driving a dummy load.</p></blockquote><p></p>
[QUOTE="meshsmith, post: 889833, member: 15646"] [b]Update 09/11/2018[/b] Right, redesigned the power supply. Here's a little step-by-step for a single supply - each channel gets a dedicated board: [IMG]https://i.imgur.com/PI3AH22.jpg[/IMG] Started with the smaller caps, resistors and SMD status LEDs: [IMG]https://i.imgur.com/txNoDZs.jpg[/IMG] Then on to the (huge) caps (24700uf per rail = 49400uf per board = 98800uf for the amplifier. Ouch!): [IMG]https://i.imgur.com/AhR9RIp.jpg[/IMG] Finally prepping the diodes. They won't get very hot, so I let two diodes share a single tower heatsink, using some SilPads which I cut for insulation: [IMG]https://i.imgur.com/a6dCWaX.jpg[/IMG] Final PSU: [IMG]https://i.imgur.com/OZHKZ7t.jpg[/IMG] Testing will be done this weekend. It will no doubt require a soft-start circuit to prevent it popping fuses like it ain't a thang, so will build one of those as well and test it driving a dummy load. [/QUOTE]
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Showcase - DIY LM3886 100W+ bridge/parallel build
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