Your circuit needs a stable voltage reference and it has to be exactly 4.3V — not 'close enough.' The 1N4731 is a 1-watt Zener diode that holds that reference tight under load. Slot it into your build or swap it straight into the board you're repairing. Jaycar component. Spec's right, no guesswork
| brand | Jaycar |
| part_number | 1N4731 |
| zener_voltage | 4.3V |
| power_rating | 1W |
| component_type | Zener Diode |
| category | Electronics & Components |
| subcategory | Electronic Components |
