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You need a good-quality ~10uFd per reg so they stay stable. That's for any current, assuming it flows "out".If you have spikes injected IN to the reg, and they do harm, you might want more. In this case you don't: the relays may kick but they are on their own dedicated supply and a little kick does them no harm.If you want to keep impedance AT the chip pins _low_, you need a 0.1uFd ceramic for each chip and a 100uFd electro for every handful of chips. See any large vintage channel strip. With that much bypassing ON the audio board, no extra capacitance is needed on the regulator output.
You need a good-quality ~10uFd per reg so they stay stable. That's for any current, assuming it flows "out".
If you have spikes injected IN to the reg, and they do harm, you might want more. In this case you don't: the relays may kick but they are on their own dedicated supply and a little kick does them no harm.
If you want to keep impedance AT the chip pins _low_, you need a 0.1uFd ceramic for each chip and a 100uFd electro for every handful of chips. See any large vintage channel strip. With that much bypassing ON the audio board, no extra capacitance is needed on the regulator output.
