Pin details of IC KA 2102A
Substitute : µPC 1353C
Funtions :
- Sound if and audio output
- FM detector
- Electronic attenuator
| Pin No | Function | Voltage |
| 1. | Sqelch | 9.8 |
| 2. | FM detector coil | 4.8 |
| 3. | Electronic attenuator(decoupling capacitor) | 5.9 |
| 4. | Detected audio signal output from FM detector | 5.2 |
| 5. | Supply for sound IF section | 8.4 |
| 6. | Decoupling capacitor(for improving sound quality) | 7.9 |
| 7. | Detected audio signal input | 3.8 |
| 8. | Audio signal output to speaker | 7.8 |
| 9. | Bootstrap capacitor (to improve sound quality) | 15.8 |
| 10. | Positive supply(+Ve)for audio section | 19.3 |
| 11. | Feedback circuit(output to input)to improve sound quality | 7.8 |
| 12. | Sound IF signal input(Hot end)(5.5MHz.) | 2.4 |
| 13. | Sound IF signal input(Cold end)(5.5MHz.) | 2.4 |
| 14. | Volume control (electronic attenuator) | 0.1 |