Personally I'd just turn down the volume to lessen the buzz and live with it. Those adapters were never meant to go inside a real cabinet it's for people who have a test bench, you setup your bench for Jamma and use adapters for each board instead of a custom harness for each. Whoever did that to your machine created so much work for themselves for nothing, AR2's are so simple there's no reason not to fix them. They took 1 step forward 20 steps back, threw away the baby with the bath water, and shot themselves in the foot with this "fix". I've seen people do this before for other games, don't know why people do this but they do. On paper changing everything out in the power section seems like a good idea to ensure reliability but in practice you'll find out it'll never work as well as the original stuff. The only easy fix I can think of for your game would be to take a MISTER FPGA with a jamma adapter, set it for analog video out, set it to autoboot centipede, set your buttons, and don't tell anyone it's not original hardware

If that 19-1 jamma board is working fine directly plugged in the jamma harness the mister will too and the mister can perfectly play centipede like real hardware. You can make a mister jamma setup for cheaper than you can buy one, you need a bare de-10 nano or clone can cost about 100$ and a mister jamma adapter which is also 100$. Your trackball is already likely usb hooked up the mister will definitely work with it