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RE: shunt regulated upgraded ParamourII 45 project starts today

The "rule of thumb" comes about from series feed power stages, where all of the signal current flows through the power supply. The peak signal current, normally supplied from the last capacitor of the power supply, must then come from the shunt regulator shunting less current - essentially, the output stage and shunt regulator act like a class-A push-pull stage, swapping current back and forth.

For all circuits, the shunt regulator must be able to supply the peak current demanded from the circuit being regulated. In parafeed, the power supply signal currents are small except at the lowest frequencies. For 2 watts output at 30Hz with a 3000 ohm load (the upgrade Paramour output stage) the current through the 40 henry inductor is 14.5mA peak. Assuming this is the worst case, that is the minimum shunt reg current. For driver and preamp circuits, the peak signal current is usually no more than 20% of the quiescent current.

Of course there is always some virtue in operating circuits (such as shunt regulators) with some current overhead. So we don't really know how well this low current reg/parafeed combo will work - hence the experiment. Based on other experiments with shunt regulators over the years, we expect great things - but listening will tell.

This post is made possible by the generous support of people like you and our sponsors:
  Michael Percy Audio  

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