Functions :
| Pin No. | Functiions | Voltage |
| 1. | 5.5 MHz sound IF input(inter carrier sound) | 2 |
| 2. | 5.5 MHz sound IF input(inter carrier sound) | 2 |
| 3. | Audio output | 4 |
| 4. | FM detector | 4 |
| 5. | FM detector | 4 |
| 6. | DC volume control(voltage varies with volume control setting) | 2.1 |
| 7. | Audio signal input | 4.6 |
| 8. | Tone control | 9.8 |
| 9. | Audio signal output | 10 |
| 10. | Positive supply (+ Ve terminal) | 20 |
| 11. | Audio amplifier (bias voltage) | 11.5 |
| 12. | DC volume control bias voltage | 11.5 |
| 13. | Ground (-Ve supply terminal) | 0 |
