After an eternity I finally got a low noise amplifier inside a metal box that didn't oscillate! So, I quickly compared two regulators on my voltage regulator module:
Regulator Amplified Noise pp
78L08 200mV
TL431 15mV
78L08 + capacitance multiplier 4mV
These readings would need to scaled to match previous results. But for now I have confirmed, in my mind, how much better a TL431 is over a jellybean regulator.
73's
Richard
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