Table of Contents
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=1/2Ï€RC, 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
| Part | Value | Description | Quantity |
| Capacitors ¹ | |||
| C1, C23, C26 | 1µF (105) | Polyester Capacitor | 3 |
| C2, C14, C21, C29 | 100nF (104) | Ceramic Capacitor | 4 |
| C3 | 47µF/25V | Electrolytic Capacitor | 1 |
| 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 |
| Semiconductors | |||
| 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 |
| Resistors 1/4W | |||
| 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 |
| Miscellaneous | |||
| 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
Gerber added
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Download the Datasheet in PDF.
Buy DIY kits or assembled board for this circuit TDA7377 2.1 direct from China to worldwide via AliExpress.
I did it but the truth is it didn’t work for me it doesn’t give me audio it just generates an annoying noise
I’m sorry to hear that you’re experiencing issues with the amplifier circuit. It sounds like there may be a problem with the connections or components used. Double-checking the wiring and ensuring that all components are properly connected and functioning correctly may help troubleshoot the noise issue. Additionally, verifying that the input signal source is working properly could also be beneficial in resolving the audio problem. Good luck with resolving the issue!
Hi,What is the voltage of the capacitors?
Hello gholam
25V
There is a total mess in this article. The diagram does not correspond to the PCB in terms of component numbering, then there is an error note that makes things even more blurred.
For example:
– in diagram and also in the part list C27 is 100nF polyester –> in error note it is 100uF electrolytic and have to be inverted (???)
– C26 in diagram and in the part list is 100nF polyester –> in error note it seems be 10nF ceramic and have to be removed or changed with 6.8nF
– the resistors R8, R10 and R18 are not 47K as is written in error note and none of them are not connected at the GND in the diagram.
This article is a total disrespect from the owner to those who read it.
Replace this pcb to the correct one., pls……..
Oi. Tudo bem?. Cara seu trabalho e incrÃvel. Parabéns. Gostaria de montar um circuito usando dois tda7377. Estou na dúvida se e possÃvel. Seria possÃvel montar um circuito montando os dois juntos? Por favor. Obrigado, Felipe.
Olá Felipe
Sim, porém não será possÃvel ligar os 2 em ponte.
Can you send me pcb.
Hello Hosein
PCB in the download section!
buenas noches,estoy armando este ampli 2.1,y revisando la lista, de componentes veo que la r 23 esta 2 veces con distinto valor , viendo el esquema electronico ,deduzco que la r 25 es la que no esta en la lista ,es de 10k,,,sacame de la duda ,,muchas gracias
Good work I would like one to send to me kenya
DC volt at sub output
C22 has wrong place!!!!
pcb size pls
How many volts are in the capasitors…? Plss help
please make an amplifier using sta543sa 2.1 channel or 4.1 using 2ics
Thanks,i did the project and it is fine ,please keep up.Thanks
please sent pcb making copper sheet in my email id.
hot to add volume channel to amolifier channel
Hi,
can you please give out the voltages of the capacitors?
Plz send PCB size
hola a todos por favor me pueden decir los voltios de los condensadores
que tal suena es te amplificador, este diagrama ya esta probado gracias
please send 5.1 pcb circuit.
can anybody pls tell me the volts of all capacitors used in this amp because i don’t which capacitor is of which volts to be use in this amp because i am a newbie in this electronic world// pls pls pls
16V
mam/sir do you have a diagram and tools for 12v battery amplifier please reply thx send to my FB Rodel Resurreccion
hi bro can u send me the true true vision of the pcb design，because i have try design but still don have any sound.
Plz send PCB drilling pic and PCB size
Hello sir plz your PCB size send my gmail id
Good day can i ask something deffernt.? It is ok if i install a bluetooth for input for x3 and x4 instead of audio wire.?and How ..?
Hope can someone answer my queation sorry for begenner question
SEND FILES TO MY E-MAIL PLASE
h3lLoWw pOwZx
There is an error on downloading the pdf files. I loved your work and I am new to this field. I am hoping i could use you work for my own personal use. Please email me good sir! Keep up the good work.
SEND FILES TO MY E-MAIL PLASE
YOU ARE AWSOME THIS IS WERY WELL BOT I CANT DONLOAD PLASE SEND THAT TO MY E-MAIL PLEASE…………
na huj publikujesz coś co kurwa nie działa
i need some solution & help
.
He terminado el circuito, :) funcionó muy bien haciendo unas modificaciones. He sustituido las resistencias R6 y R10 por unas de 100K y, ubicándonos el en esquema, conecte el pin 3 del IC1A y pin 5 del IC1B a la salida 12v del regulador 7812 mediante una resistencia también de 100K, y el pin 3 del IC3A también lo he conectado con una resistencia de 100k a la salida 12v del regulador 7812. Suena muy bien en mi equipo.
Leia mais: http://www.te1.com.br/2013/04/circuito-amplificador-potencia-audio-2-1-tda7377-estereo-subwoofer/#ixzz3KErr1l7v
© http://www.te1.com.br
nice filter…
very good performance…
i like it…
thank you toni, can U give me a 5.1 surround sound decoder circuit please…
Publicado em 7 de novembro de 2014 Ã s 3:07 pm
Estou construindo o circuito e eu notei várias coisas:
Que a lista de componentes para 100uF capasitores a 2, C1 e C26, ea imagem componente obter 3 capasitores acrescentando c12 que está na lista e disse que, para 100nF O Stand?
Esse pino 9 não está conectado fazer eu deixo bem ou ligar para a terra?
Eu estou usando um tradutor
i want to print the pcb copper side to make the board for the amp but i must mirror it or what ? plz send me back
Thank you for shairing a nice projec.I’m so intrested about developing this. Since I’m new to fiel please be kind wnough to e-mail me the all details/documents relaeted to above project. Thanks again.
I think this project was only meant to be used with a car battery and the power supply section was just an after thought, you would have to make a separate board for the supply. I will post a schematic later on.
The project requires 3 amps, LM7812 can only regulate 1 amp. you need to use 2 TIP 2955 transistors. Please check out, http://www.zen22142.zen.co.uk/Circuits/Power/1230psu.htm as reference.
The power supply requires 3 amps, the regulator LM7812 will not be enough since it can only regulate 1 amp, you are supposed to add 2 TIP 2955 into the circuit for reference,
check out http://www.zen22142.zen.co.uk/Circuits/Power/1230psu.htm
Hello. How did you do the rendering of the pcb?? I’m talking about the first picture. Thanks!
I built this, but not working checked pre-amp stage no signal out put, is there any modification require, pl mail.
Hello guys,
circuit is okey and the PCB. After making PCB, fix the IC in their respective place and check its pins are matching with circuit. I had this similar problem. If IC pins are not matching, it will not work. Only solution, during printing the PCB outline, take the mirror image of PCB outline and take print.
hi everyone i build tda7377 sub amp but it is distorting at low and high volume but if i test a power amp with no preamp it sound fine where is da ze problem
Hello sir please tell me another ic, which i can use in the palace of LM4558N
Hii… I have installed this circuit. But I am unable to get output volume. Also there is noise in output. Sound is anyway not coming. Please help. Some values and components are missing in part list. Please update and reply for solution.
basta ligar 3 resistores de 47k cada entre os pinos 8 e 3 e 8 e 5 do IC 1 (4558) e entre os pinos 8 e 3 do IC 3 (4558). Solde os resistores em cima dos IC’s. Funciona ok.
Muito obrigado amigo, estava quebrando a cabeça com esse projeto há 2 semanas, já estava quase desistindo desse amplificador. Agora funcionou perfeitamente!
i build this circuit, amp side ok ,but preamp side not working,distosion
Hello! sir,
Please tell me the equivalent ic of LM4558N ic.
theres something wrong in the circuit.
pin 8 and 9 should be connected right? theres also a problem in the 4558 circuit.
theres another circuit here:
i hope this will work. sorry about my english.
i build this project but its not working.
my question is:
> what is the right resistor? because in your parts list the R21 is 68k but in the component side its 6.8k.
> Is it ok if i use mylar capacitor?
hope for your rply
This project is actually a new half level …. I’m getting a
problem in ic lm4558, if I give the
current at this power, that happens no
sound at all who came out in speeker …
please its support on issues that I’m dealing with this takz….(sory my english is suck)
Check pin 9 of tda 7377 isn´t connected to the signal ground.
7372 ic not 7373
I think the ic should be 7372 and not 7377 which has only 2 outputs.
firstly, thank you for sending me this project. I bought all the materials for this project but I can not get capacitor 100nf(polyester) in my local area. is there any similar capacitor I can use.
Thank you.
Sorry for my previous comments.I got answer from the article itself.Once again Sorry for wasting you’r time.
Which transformer i have to use in this project?
First i am thanking you to give a nice project. It is very useful for a beginner like me.Can you please upload a pdf for pcb copper side ? Which type of speaker and sub woofer i have to use (rating also)?
Regards..
I like your work
keep on doing it