Pin Details of IC HA 1128
Functions : Sound IF ,Sound Detector and amplifier
| Pin No. | Function | Voltage |
| 1. | IF amplifier(Limiter) | 2 |
| 2. | IF amplifier input | 2 |
| 3. | Ground for IF amplifier (Limiter) | 0 |
| 4. | Ground(-Ve)supply voltage | 0 |
| 5. | Positive(+Ve)supply voltage | 11.3 |
| 6. | Electronic Attenuator(DC volume control) | 4.7 |
| 7. | Sound signal input | 6.4 |
| 8. | Buffer(output stage) | 5.7 |
| 9. | Compensation | 3.9 |
| 10. | FM detector | 3.9 |
| 11. | Not Connected | NC |
| 12. | Audio driver output | 5.3 |
| 13. | To speaker | 5.9 |
| 14. | Audio driver input | 1.6 |
