Power amplifier operates in class D power amplifier is powerful enough produces a total output power 240 W (120 W each channel). Much power is generated by a chip made by Philips TDA8924.
Reference Data :
| Supply voltage |
: ±12V …± 30V |
| Supply current absence of a signal |
: 100mA |
| Output power (max) |
|
| in stereo | : 120W |
| in mono | : 240W |
| Efficiency |
: 90% |
Chip also has a short-circuit proof output, thermal protection and acoustic protection from the “inrush current” when you turn on and off. The scheme provides two options turn on an amplifier – both stereo and mono on a bridge. So this could be used for amplifier subwoofer.
Power to the amplifier is connected to the following scheme :
Parts list :
| Notation on the chart | Value |
| C1, C2, C3, C4 | 470nF |
| C5, C6 | 330 |
| C7, C11, C17, C20, C8, C12, C18, C22 | 100 |
| C23, C24, C32, C31 | 15nF |
| C25, C26 | 560 |
| C28, C27 | 1mkF |
| C30, C29, C9, C19, C15, C13, C10, C21, C14 | 220nF |
| C16 | 47 |
| D1 | KS156A |
| L1, L2 | 10 uH |
| R1, R2, R3, R4 | 5.6 kOhm |
| R9, R8 | 4.7 |
| R10, R11 | 22 |
| R6, R7 | 39kOm |
| R5 | 30kOm |
| DA1 | TDA8924 |
| Power supply | |
| C1, C2 | 100nF |
| C3, C4 | 470uF/35V |
| C7, C5, C6 | 47uF/63V |
| L1, L2, L3, L4 | MURATA BL01RN1A2A2B |
thanks