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Using zeners for G2 regulation
Using zeners for G2 regulation
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Old 23rd September 2019, 10:12 AM   #31
disco is offline disco  Netherlands
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Join Date: Apr 2006
Location: Holland
Perhaps you observe the loading of a bypass cap at G2? For best regulation current excursions need to be as low as possible (against heating up), that's where the BJT (or FET) is of aid.
When you observe the dynamic properties of a sole 1N5377B, its impedance is 760 ohm at 1 mA, dropping to 75 ohm at 15 mA, while the maximum regulator current is 52,5 mA. A bypass of 1uF will ride along with G2 voltage at any signal level.
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