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DIY & Tutorials
DIY For Audio
Building amps with Intuition. A long story.
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<blockquote data-quote="ludo" data-source="post: 319063" data-attributes="member: 691"><p>What size is the transformer? 600VA?</p><p></p><p>Toroids tend to turn on with a massive surge. They like slow-blow fuses, or soft-start circuits. They sometimes pop even slow-blow fuses that are over-rated when switched on.</p><p></p><p>You take the VA rating of the transformer and divide that by the mains voltage to get the appropriate fuse rating. </p><p></p><p>600VA/220V=2.72A</p><p></p><p>So that would be 3 Amp. It will most probably blow at switch-on. 5 A or 6.3 A slow-blow would be more useful and still offer some protection in case of a catastrophe. It will still pop sometimes.</p><p></p><p>I'll scratch out the layout for a simple soft-start circuit and put that up here. Using that and a 3 Amp fast acting fuse is the better way </p><p>to do it.</p></blockquote><p></p>
[QUOTE="ludo, post: 319063, member: 691"] What size is the transformer? 600VA? Toroids tend to turn on with a massive surge. They like slow-blow fuses, or soft-start circuits. They sometimes pop even slow-blow fuses that are over-rated when switched on. You take the VA rating of the transformer and divide that by the mains voltage to get the appropriate fuse rating. 600VA/220V=2.72A So that would be 3 Amp. It will most probably blow at switch-on. 5 A or 6.3 A slow-blow would be more useful and still offer some protection in case of a catastrophe. It will still pop sometimes. I'll scratch out the layout for a simple soft-start circuit and put that up here. Using that and a 3 Amp fast acting fuse is the better way to do it. [/QUOTE]
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DIY & Tutorials
DIY For Audio
Building amps with Intuition. A long story.
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