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DIY & Tutorials
DIY For Audio
Old Suitcase Turntable Amp Rescue
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<blockquote data-quote="handsome" data-source="post: 1063788" data-attributes="member: 772"><p>150R resistors add resistance between 6X4 and thus allow the larger-than-spec cap. Basically the rectifier delivers pulses of current into the cap. The larger the cap the bigger the pulses which can damage the rectifier. Placing a resistance on each anode or on the cathode of the rectifier allows it to ?feed? a bigger cap by resisting the current flow. The resistance values are usually mentioned in the datasheets. </p><p></p><p>Directly rectifying the mains voltage (no transformer) is probably illegal in modern safety standards. </p><p></p><p>You are correct to connect mains earth to the chassis.</p></blockquote><p></p>
[QUOTE="handsome, post: 1063788, member: 772"] 150R resistors add resistance between 6X4 and thus allow the larger-than-spec cap. Basically the rectifier delivers pulses of current into the cap. The larger the cap the bigger the pulses which can damage the rectifier. Placing a resistance on each anode or on the cathode of the rectifier allows it to ?feed? a bigger cap by resisting the current flow. The resistance values are usually mentioned in the datasheets. Directly rectifying the mains voltage (no transformer) is probably illegal in modern safety standards. You are correct to connect mains earth to the chassis. [/QUOTE]
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DIY & Tutorials
DIY For Audio
Old Suitcase Turntable Amp Rescue
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