Your 15V supply is sagging under load and a 1W zener won't cut it. This Jaycar 1N5352B handles 5 watts at 15V, so the reference stays locked even when the current spikes. Five times the headroom of the standard part. Solder it in, power up, done
| brand | Jaycar |
| part_number | 1N5352B |
| voltage_rating | 15V |
| power_rating | 5W |
| type | Zener Diode |
| rrp | $5.00 |
| category | Electronics & Components |
