Here is another circuit in the series of audio power amplifiers. Previously we had already posted 3W and 20W audio amplifiers using transistors. Now we use an integrated circuit instead of transistors for designing audio amplifier circuits. By using IC TBA810 one can get a power output of 7W.
The audio power amplifier featuring the TBA810 integrated circuit is shown in figure 1. This IC incorporated build-in-terminal shutdown, which automatically reduces the output in the event of sustained overloads or if the heat sinking arrangement is inadequate. We use a few passive components like resistors and capacitors to build this audio amplifier.
The input impedance of the IC TBA810 (IC1) is very high about 5MΩ. The impedance of the circuit 7W audio amplifier using TBA810 is determined by resistor R1 and sensitivity is determined by resistor R2. The input sensitivity of the circuit is 65Mv with the value of resistor R2 = 47Ω.
Capacitor C2 should be fairly large to ensure a good low-frequency response. Capacitor C3 decouples the supply to the earlier stage of the IC. This decoupling reduces noise in the pre-amplifier stage of the IC and also eliminates output-input coupling through the power supply. Additional RC feedback network may be inserted to boost low frequency to compensate for a poor speaker bass response.
Various other Audio Amplifier Project posted in bestengineeringprojects.com
- 10- Watt Audio Amplifier
- Audio Amplifier Circuit using Timer IC 555
- Low Power Audio Amplifier using LM386
- 20W Audio Amplifier using TDA2020
- 20 Watt Audio Amplifier using TDA2003
PARTS LIST OF 7W AUDIO AMPLIFIER USING TBA810
| Resistor (all ¼-watt, ± 5% Carbon) |
| R1 = 47 KΩ
R2 = 47 Ω R3 = 100 Ω R4 = 1 Ω |
| Capacitors |
| C1 = 10 µF, 12V (Electrolytic Capacitor)
C2 = 250 µF, 6V (Electrolytic Capacitor) C3 = 100 µF, 12V (Electrolytic Capacitor) C4 = 4.7kpF (Ceramic Disc) C5 = 100 µF, 16V (Electrolytic Capacitor) C6 = 1.5kpF (Ceramic Disc) C7, C10 = 0.1 µF (Ceramic Disc) C8 = 1000 µF, 16V (Electrolytic Capacitor) C9 = 100 µF, 25V (Electrolytic Capacitor) |
| Semiconductor |
| IC1 = TBA810 (Audio Amplifier IC) |
| Miscellaneous |
| LS1 = 4 Ω loud speaker |
which preamplifier can i prefer. i want to use this circuit in my microphone project.
please refer to the circuit Microphone Amplifier using 741.
http://bestengineeringprojects.com/microphone-amplifier-using-op-amp-741/