Functions :
Sound output
Sound output
| Pin No. | Functions | Voltage |
| 1. | Positive ( + Ve supply voltage ) | 20 |
| 2. | Audio frequency output for driving the speaker | 10 |
| 3. | Not conneted | NC |
| 4. | Ground (- Ve supply voltage ) | 0 |
| 5. | Not connected | NC |
| 6. | Ground (- Ve supply voltage ) | 0 |
| 7. | Audio frequency input | 1.2 |
| 8. | Decoupling capacitor | 11.5 |
| 9 | Negative(-Ve ) feedback (output to input ) | 0.1 |
