Power amplifier is an useful device in audio system and it gives power for speaker to work good.
TDA4935 is one best and is strong dual audio power amplifier IC and people use it in bridge mode to get high power.
Also, this Power Amplifier Circuit using IC TDA4935 show bridge design with TDA4935 and it power 8 ohm speaker with high output and low distortion.
Circuit Working:
Parts List:
| Components | Values | Quantity |
|---|---|---|
| Resistor | 1Ω 1/4 watt | 2 |
| Capacitor | Ceramic 220nF | 2 |
| Ceramic 100nF | 1 | |
| Electrolytic 1µF 25 V | 3 | |
| Electrolytic 100µF 25 V | 1 | |
| Electrolytic 1000µF 25 V | 1 | |
| Semiconductors | IC TDA4935 | 1 |
| Heatsink IC TDA4935 | 1 | |
| Speaker 8Ω | 1 |
TDA4935 is power amplifier which make audio signal strong and it needs heat sink for cooling.
Circuit uses power from +8V to 30V DC and it have input capacitors, feedback parts and output design for good sound.
Then audio goes in at pin 7 and pin 2 through C1 and C2 which are both 1µF and these stop DC let only AC audio pass.
For stable gain resistors R1 and R2 with 1Ω each work with capacitors C3 and C4 of 220nF which help reduce distortion and shape sound.
After amplify the sound goes to 8Ω speaker through C5 100µF, then C5 stop DC and protect speaker and also C6, C7, C8 are decoupling capacitors and they keep power clean and steady.
After that, TDA4935 IC work in bridge mode and both speaker ends get signal in opposite phase and this doubles voltage and gives 4x more power than the normal design.
How to Build:
To build a Simple Power Amplifier Circuit using IC TDA4935 follow the below mentioned steps:
- First, gather all parts as in circuit diagram.
- Next, pin 1 of TDA4935 goes to one side of 8Ω speaker and also connect C4 + R2 in series to GND
- After that, pin 2 connect to pin 7 through C2
- Now pin 3 connect to GND through C7
- Then pin 4 and 6 connect to GND
- Also, pin 5 connect to +8V to +30V power and also connect C6 and C8 to GND
- Further, pin 7 connect to audio input through C1 and GND.
- Then pin 8 connect to GND through C5 and finally, pin 9 connect to other side of speaker and also connect C3 + R1 in series to GND
Conclusion:
To conclude, Power Amplifier Circuit using IC TDA4935 is good power amp for low ohm speaker, it is simple in design, strong sound and is great for DIY audio.
Also, with good heatsink it gives clear and stable sound with no noise.