The PCB is thru-hole and the opamp is a socketed DIP-8, which TI does not offer for the LME49990. More importantly, after the board achieved its modest set of research objectives, I retired it.
why use a tl431 voltage as levelshift (1/f noise in the loop) ? why not use a resistor as there is a current source feeding it ..
Please feel free to do that if you build your own regulator. With a 10mA current source and 5V drop you'd need about a 500 ohm resistor. Calculate the required value of C6 to get the performance you want, at both extremes of the frequency range, round to nearest standard capacitance value, and drop it in.
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