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TDA7377 2.1 amplifier circuit diagram with PCB, complete circuit power amplifier 2.1, 3 channels 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 PCB, Power Supply, Preamplifier, bass filter, volume, and tone control.
About TDA7377 2.1 amplifier circuit diagram with PCB Stereo 2.1 + bass channel
Circuit to take advantage of the possibilities of the TDA7377 that presents 4 outputs, being 2 simple for the satellites and the other two bridged for the subwoofer.
The circuit has balance control (P2), if you don’t need it just connect the points by jumpers. General volume adjustment (p1), tone control and subwoofer volume adjustment.
We have a preamplifier (IC1) and bass filter (IC3) with 20-150Hz pass band.
The circuit already has a power supply, just connect a simple transformer (AC) from 9 to 12 Volts/3 Amperes or more, you can also connect a source (DC) from 12 to 18 Volts / 3 Amperes. This can be a computer or notebook power supply, car/motorcycle battery, etc.
In the printed circuit board production process, be aware of possible shorts between the tracks, use a heat sink in the Integrated TDA7377 and sockets for the operational amplifiers, this facilitates future maintenance.
Potentiometer P2 makes the volume adjustment and P1 makes the balance between the channels, Ic1 is configured as a non-inverting amplifier with gain equal to 3.6. If you need to change the gain, just change the value of the resistors R4/R, R3/C34 form a low-pass filter with a cut-off frequency of 86 kHz. The components around P3 form the tone control of our amplifier.
The formula, if you want to change the frequency response, is:
fc=1/2πRC, with C37 for high frequency and C36 for low frequency.
Ic3A forms a non-inverting amplifier with gain 11. If you need to change this value, change R1/R19. Ic3B forms a low-pass filter with cutoff frequency = 150Hz. R20/C25 forms a low-pass filter with frequency 15.9 KHz.
TDA737X integrated circuits usage table
Power supply table for TDA737X integrated circuits
|CI||DC||AC||Current||Power 4 Ω||Power 8 Ω|
|TDA7377||12 — 16V||9 — 12V||3A||2X 6W + 1X 20W||—|
|TDA7375||12 — 16V||9 — 12V||3A||2X 7W + 1X 25W||—|
|TDA7379||12 — 18V||9 — 15V||4A||2X 11W + 1X 38W||2X 7W + 1X 20W|
|STA540||12 — 20V||9 — 15V||4A||2X 11W + 1X 38W||2X 7W + 1X 20W|
Power, considering the maximum voltage supported by the IC.
You can connect to 2 Ohms loads as long as the DC voltage is not higher than 15V (7379 and 540) and 12V (7375 and 7377).
Schematic TDA7377 2.1 amplifier circuit diagram with PCB – Stereo + Subwoofer
Suggested PCB design for TDA7377 2.1 amplifier circuit diagram
BOM for assembling the circuit tda7377 2.1 amplifier
Last Update: 03/11/2021 15:47
|C1, C23, C26||1µF (105)||Polyester Capacitor||3|
|C2, C14, C21, C29||100nF (104)||Ceramic Capacitor||4|
|C4, C15, C19||4.7µF/25V||Electrolytic Capacitor||3|
|C5, C8, C22, C33||100n (104)||Polyester Capacitor||4|
|C6, C9||1.000µF/25V||Electrolytic Capacitor||2|
|C7, C36||10n (103)||Polyester Capacitor||2|
|C10, C17||33p (330)||Ceramic Capacitor||2|
|C11, C13, C18, C20, C30||10µF/25V||Electrolytic Capacitor||5|
|C12, C27, C31, C32||100µF/25V||Electrolytic Capacitor||4|
|C16, C37||6.8n (682)||Polyester Capacitor||2|
|C24||220n (224)||Polyester Capacitor||1|
|C25||1n (102)||Polyester Capacitor||1|
|C28||4.700µF a 6.800µF/25V||Electrolytic Capacitor||1|
|C34, C35||560p (561)||Polyester Capacitor||2|
|IC1, IC3||LM4558 or TL072, or Ne5532, or equivalent||Dual operational amplifier||2|
|IC2||TDA7377 or TDA7375, or TDA7379, or STA540||Audio amplifier integrated circuit.||1|
|IC4||LM7812||12V positive voltage regulator||1|
|B1||KBL608 or equivalent||Bridge rectifier||1|
|LED1||Green Led||LED 5 mm||1|
|R1, R14, R15, R16, R17, R20, R23, R24||10k||Brown, black, orange, gold||8|
|R2, R8||1k||Brown, black, red, gold||2|
|R3, R9||3.3k||Orange, orange, red, gold||2|
|R4, R5, R11, R12||22k||Red, red, orange, gold||4|
|R6, R10, R18, R27, R28||47k||Yellow, violet, orange, gold||5|
|R7, R13||8.2K||Gray, red, red, gold||2|
|R19||6.8K||Blue, gray, red, gold||1|
|R21||68k||Blue, gray, orange, gold||1|
|R22||1.8k||Brown, gray, red, gold||1|
|R25||8.2||Gray, red, gold, gold||1|
|R26||220k||Red, red, yellow, gold||1|
|IN||Audio Input||Jst Xh 2-Way Connector 2.54 mm pitch or equivalent||1|
|SUB||Subwoofer Output||Terminal block 2 pin 5.08 mm||1|
|ROUT||Right channel output||Terminal block 2 pin 5.08 mm||1|
|LOUT||Left channel output||Terminal block 2 pin 5.08 mm||1|
|DC||DC Power Supply (Optional)||Terminal block 2 pin 5.08 mm||1|
|AC||Connect transformer||Terminal block 2 pin 5.08 mm||1|
|P1||100K (104)||Simple Potentiometer||1|
|P2, P3,||50K (503)||Double potentiometer||1|
|P4||50k (503)||Simple Potentiometer||1|
|Solder, Wires, Circuit box, PCB, heat sink for TDA, transformer, sockets for Op Amp, etc.|
Electrolytic capacitors must have a working voltage 30% > the power supply voltage.
Download the PDF Files for this assembly — PCB, Copper Side, Component Side, Pads, Silk, Schematic, Datasheet TDA7377
Download the Datasheet in PDF.
Buy DIY kits or assembled board for this circuit TDA7377 2.1 direct from China to worldwide via AliExpress.