The below circuit is a simple 60W RMS TDA7377 subwoofer circuit system. This is an easy to build project, it does not need much effort and expenses. The components are easy to obtain from even scraps so that you don’t need to suffer in building this project!
This circuit has two transistors amplifiers at input stage. The amplifier section which is based on C2383 NPN bipolar junction transistor (BJT) is for low pass filter and amplification. The other transistor amplifier which is base on the C2655 NPN BJT is for the treble frequencies amplification. Meanwhile, you can use any NPN bipolar junction transistor (BJT) for the two. The output of each of the transistors amplifiers’ is fed to the inputs of the TDA7377 amplifier circuit.
In this TDA7377 subwoofer circuit, the output1 and output2 which is the treble output is at 30W RMS (15W RMS each). For the subwoofer, the output is bridged at pin14 and pin15 of the IC. Hence, the subwoofer output driver is at 30W RMS. The total output of this subwoofer circuit is at 60W peak.
TDA7377 Subwoofer Circuit Components
Below is the list of the main components which constitute this TDA7377 subwoofer circuit.
Integrated Circuit (IC)
- TDA7377 (X 1)
NPN Bipolar Junction Transistors
- C2383 (X 1)
- C2655 (X 1)
- 2200µF (X 2)
- 1000µF (X 1)
- 220µF (X 1)
- 47µF (X 1)
- 10µF (X 5)
- 100nF i.e. 104 (X 1)
- 22nF i.e. 223J (X 1)
- 10KΩ (X 1)
- 3KΩ (X 1)
- 2KΩ (X 1)
- 100Ω (X 2)
- 22Ω (X 1)
Mounting the IC on a heat sink is necessary for cooling it while operating. Also, you should apply thermal paste between the IC and the heat sink. This makes heat leaves the IC faster, transferring it to the heat sink.
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TDA7377 Subwoofer circuit diagram