The filter stage on your supply is drifting and you need a 4.7µF cap that actually holds its charge without leaking like a standard electrolytic. This Jaycar part is rated to 50VDC and 85°C, with leakage behaviour that tracks close to a tantalum cap at a much friendlier price point. Polarized – positive terminal must always sit above negative. Slot it into power supply filtering, input or output smoothing, or an LPF circuit. One swap, ripple gone
| brand | Jaycar |
| capacitance | 4.7µF |
| voltage_rating | 50VDC |
| temperature_rating | 85°C |
| type | Low leakage electrolytic capacitor |
| polarity | Polarized |
| sku | RL6424 |