Complete circuit power amplifier 2.1, 3 channel with TDa7377, include in the layout, power supply, bass filter as well as the full PCB layout. Project amplifier ideal for various applications. includes in the board, Power Supply, Preamplifier, bass filter, volume and tone control.
About designing amplifier with TDA7377 Stereo 2.1 + bass channel
Circuit to use the possibilities of the TDA7377 which has 4 outputs, 2 simple for satellites and the other two bridged for the subwoofer.
The circuit has balance control (P2), if not just need to connect the jumpers. Adjust overall volume (p1), tone control and volume adjustment of the subwoofer.
We have a pre amp (IC1) and bass filter (IC3) with bandwidth of 20-150Hz.
The circuit already has power supply by simply connecting a transformer (AC) simple 9-12 Volts / 3 Amps or more, can also be connected a source (DC) 12-18 volts / 3 amps. Can be a source of computer or notebook, battery car , etc.
This circuit is not the same as traditional circuit which adopts RC to control Bass/Treble via potentiometers, its Bass circuit adopts Low Pass Filter,doesn’t need additional Treble potentiometer, so it is quite suitable to be used for the power supply refitting for automobile, motorcycle, electric vehicles and multimedia audios, it can help a lot for promoting your sound quality.
Schematic of the audio power amplifier with TDA7377 2.1 – Stereo + Subwoofer
Suggested PCB design for audio amplifier 2.1
|Resistor 1/4W 5%|
|R1, R3,||2.7K – Red, Violet, Red, Gold|
|R2||3.3K – Orange, Orange, Red, Gold|
|R4, R11, R13||47K – Yellow, Violet, Orange, Gold|
|R5, R12, R15, R19, R20||8.2K – Gray, Red, Red, Gold|
|R6, R7||1k – Brown, Black, Red, Gold|
|R8||68K – Blue, Gray, Orange, Gold|
|R9, R10, R14, R18, R23, R26||10K – Brown, Black, Orange, Gold|
|R16, R17||22K – Red, Red, Orange, Gold|
|R21, R23||1.8K – Brown, Gray, Red, Gold|
|R22, R24||6.8K – Blue, Gray, Red, Gold|
|P1, P3||47K or 50K – Dual Potentiometer logarithmic|
|P2||100k – Dual Potentiometer|
|P4||47K or 50K – Single Potentiometer logarithmic|
|C3, C4,C14, C19, C30||10µF|
|C5, C7, C8, C9, C10||4.7µF|
|C6, C28, C31||100µF|
|C22||0.47µF or Polyester|
|Capacitors Polyester and ceramic|
|C2, C15, C20, C32||100nF (104) – Ceramic or Polyester|
|C11, C12||100pF (101) – Ceramic|
|C13||220nF (224) – Polyester|
|C16, C26, C27||100nF (104) – Polyester|
|C17, C18||6.8nF (682) – Polyester|
|C21, C23||4,7nF (472) – Polyester|
|C24, C25||33nF (333) – Polyester|
|C29||1nF (102) – Polyester|
|B1||Bridge Rectifier FBU8K or equivalent 200V / 2A|
|IC1||7812 – positive voltage regulator 12 Volts|
|IC2, IC3||LM4558N or equivalent – Dual Operational Amplifier|
|IC4||TDA7379 or equivalent – see table in the text|
|LED1||Red Led 5mm|
|ST1, ST2||Connector 9-way (Optional)|
|X1||Connector Terminal Block 2 pin – AC|
|X2||Connector Terminal Block 2 pin – DC Power|
|X3||Connector Terminal Block 2 pin – Input right channel|
|X4||Connector Terminal Block 2 pin – Input Left Channel|
|X5||Connector Terminal Block 2 pin – Audio output Left channel|
|X6||Connector Terminal Block 2 pin – Audio output Right channel|
|X7||Connector Terminal Block 2 pin – Audio Output Subwoofer|
|Welding, Wire, Box to accommodate circuit, printed circuit board heatsink to the TDA7377, Transformer, Sockets for Op Amp, etc..|
Buy kits or Assembled board for this circuit TDA7377 2.1 direct from china to worldwide via Aliexpress.
- The capacitor C27 (100µF) inverted.
- Remove C26 de 10nF or change to 6.8nF.
- Change the resistors R8, R10 and R18 47K, from GND reference to + 12V. Pull up terminal of each resistor connected to GND and solder a wire to the jumper after 7812 or pin 8 of the op amp.