Well, since the opamp is fed from the extremely clean regulated voltage, filtering its supply doesn't bring you anything. On the contrary, it introduces impedance in the supply line and you don't want that, it introduces load ripple on the opamp supply.
BTW Be careful with the '797. We never recommend the '797, not because it is bad; it's a great opamp, but it sometimes has a tendency to oscillate in these circuits.
Jan
BTW Be careful with the '797. We never recommend the '797, not because it is bad; it's a great opamp, but it sometimes has a tendency to oscillate in these circuits.
Jan