Pin details of IC KA 2101
Substitute : CA3065, AN241, TA7176AP, HA1125, LA1365, LM3065, MC1358, ULN2165
Functions : Sound IF amplifier limiter,low pass filter, FM detector and AF amplifier
| Pin No | Functions | Voltage |
| 1. | Sound IF input (5.5 MHz. inter carrier sound) | 1.9 |
| 2. | Sound IF input (5.5 MHz. inter carrier sound) | 1.9 |
| 3. | Sound IF ground | 0 |
| 4. | Ground(-Ve)supply voltage | 0 |
| 5. | Positive(+Ve)supply voltage | 11.1 |
| 6. | DC volume control(electronic attenuator ) | 1.5 |
| 7. | De-emphases | 6.6 |
| 8. | Audio signal output | 5.9 |
| 9. | FM detector | 4 |
| 10. | FM detector | 4 |
| 11. | Not connected | - |
| 12. | Audio output from driver section | 4.8 |
| 13. | Tone control | 5.4 |
| 14. | Input from audio driver section | 0.6 |