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DIY For Audio
Old Suitcase Turntable Amp Rescue
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<blockquote data-quote="handsome" data-source="post: 1064094" data-attributes="member: 772"><p>You are correct the resistors are there to limit current. Instantaneous current is the 'peak' current rating and this is the charging pulses. Hot-switching should be an anomalous, short term condition - it results in a few cycles of large current pulses. In the Vox example they could have placed the standby switch after the first capacitor, this way that capacitor will always be charged up during standby and thus not create a massive current draw when going from standby to operate. In normal operation charging the capacitor is a constant condition - and technically these currents should be calculated in order to remain within the peak/instantaneous rating. However rectification is very complex and calculating the results (with a slide rule in those days!) is not casual undertaking. This is why datasheets give maximum capacitance and minimum resistance recommendations - they doing the brain surgery for you. It is interesting to see just how many modern designs willfully ignore such parameters.</p></blockquote><p></p>
[QUOTE="handsome, post: 1064094, member: 772"] You are correct the resistors are there to limit current. Instantaneous current is the 'peak' current rating and this is the charging pulses. Hot-switching should be an anomalous, short term condition - it results in a few cycles of large current pulses. In the Vox example they could have placed the standby switch after the first capacitor, this way that capacitor will always be charged up during standby and thus not create a massive current draw when going from standby to operate. In normal operation charging the capacitor is a constant condition - and technically these currents should be calculated in order to remain within the peak/instantaneous rating. However rectification is very complex and calculating the results (with a slide rule in those days!) is not casual undertaking. This is why datasheets give maximum capacitance and minimum resistance recommendations - they doing the brain surgery for you. It is interesting to see just how many modern designs willfully ignore such parameters. [/QUOTE]
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DIY & Tutorials
DIY For Audio
Old Suitcase Turntable Amp Rescue
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