Pin Details of IC HA 1389
Functions : Sound driver and Audio output amplifier
| Pin No. | Function | Voltage |
| 1. | Ground (-Ve)supply voltage | 0 |
| 2. | Audio frequency output(audio signal output to speaker) | 12.3 |
| 3. | Positive(+Ve)supply voltage(main supply voltage) | 24 |
| 4. | Supply voltage for audio output stage | 24 |
| 5. | Supply voltage for audio driver | 23 |
| 6. | Feedback(out to input)to improve sound quality | 0.7 |
| 7. | Capacitor(to minimise distortion) | 1.3 |
| 8. | Capacitor(to minimise distortion) | 12 |
| 9. | Audio signal input from sound IF section | 0 |
| 10 | Audio driver ground | 0 |
