How to Make Stereo Amplifier Using TDA-7297

In this project, today I’m going to teach you making a stereo amplifier circuit.

An amplifier is an electronic device or circuit which is used to increase the magnitude of the signal applied to its input. The purpose of an amplifier is to amplify or increase the input signal to produce an output signal which is much larger than that of the input, with a similar waveform as that of the input.

The principal of an amplifier is to produce an output signal that is a replica of the input signal with increased magnitude.

A signal amplifier is a circuit that uses electrical power to increase the amplitude of an incoming signal voltage or current signal. Stereo amplifiers are one of the most popular ways of improving the sound quality in different situations and conditions. That can be used at home, office, inside car, track and other cultural program also.

The article is being published in collaboration with JLCPCB. They supply high quality PCBs at a very reasonable price. They also can provide SMT circuit assembly.

We thanks to our sponsor JLCPCB for sponsoring us PCBs for this project circuit.

For SMT Service, Click here.

Thanks To JLCPCB.

$2 for 1-4 Layer PCBs.

Get SMT Coupons - https://jlcpcb.com/RTA

To make this powerful amplifier circuit, we might need some electronics component.

All Component list have to been given below –

Component List –

·       Sound IC – TDA 7297

·       Resistor - 47 K Ω

·       Capacitors - 10µf/50 volt *2

          47µf/25 volt

·       PCB (made by JLCPCB)

·       Stereo volume – B 100K

·       Power source – DC 12v

·       Soldering iron

·       Sound speaker *2

•        Dynamic sound
•        Great build quality
•        Impressive agility and punch
•        Rhythmic and dynamic
•        Impressive clarity and detail
•        Sonic authority
•        Dual-channel Class AB Amplifier
•        15W + 15W Stereo Output
•        Operating Voltage: 6V to 18V
•        Peak Output Current: 2A
•        In-built mute and stand-by function
•        Maximum Quiescent current: 65mA
•        Closed-Loop Voltage gain: 33dB

1.    OUT 1 +

2.    Out 1 –

3.    Vcc

4.    IN 1

5.    N-C

6.    Mute

7.    Stand-By

8.    Pw-Gnd

9.    S-Ground

10.  N.c

11.  N.C

12.  In 2

13.  Vcc

14. Out 2 –

15. Out 2 +

The schematics of PCBs can be seen above.

To make this amplifier circuit, 1^st we connect 4no and 5no leg of sound IC, 6no and 7no leg of sound IC, 8no and 9no leg of sound IC, 11no and 12no leg of sound IC. Then we need to connect sound IC 3no and 13no leg. 

Now we need to connect resistor with the circuit. We are using 47 KΩ resistors to make this stereo amplifier circuit. Connect this resistor one terminal with 6no leg of Sound IC and its other terminal with 3no leg of Sound IC.

Then we need to connect 3 capacitors with the circuit. Connect 47µf/25 volt capacitor negative leg with 8no leg of sound IC and capacitor positive leg with 7no leg of sound IC.

Thanks to JLCPCB for offering us, this PCB circuit.

There are two rest capacitors. Connect 10µf/50 volt capacitor positive leg with 11no leg of Sound IC and its negative leg with Output leg of stereo volume.

Now we connect another 10µf/50 volt capacitor positive leg with 4no leg of Sound IC and its negative terminal with Output leg of stereo volume.

To adjust sound, we are using B-100k stereo volume. We connect volume ground leg with 9no leg of sound IC.

To input sound, now we connect audio input cable with the circuit. Connect audio input “L” and “G” and “R” cable with input leg of stereo volume.

For output sound, we need to connect sound speaker with the circuit. We connect left side sound speaker with 1 and 2 number leg of sound IC and right side speaker with 14 and 15 no leg of sound IC.

 We utilize JLCPCB https://jlcpcb.com/RTA to printout our PCB.

For power source, we are using DC-12v power source. We need to connect sound IC 3no leg with positive leg of power source and sound IC 9no leg with negative leg of power source.

Now just plug-in power source and connect audio input cable with mobile. Play music on mobile and enjoy the high quality sound.

If you complete design of your PCBs, then it is time to order PCBs. To order best quality PCBs, just visit JLCPCB and click on the “QUOTE NOW” button.

Since 2006, JLCPCB continuously driven to become more efficient and to reduce costs. They promise to offer customers the most economic PCBs forever. JLCPCB makes cheapest but top quality PCBs possibly because of scale effect, extremely high production efficiency and less manpower cost.

You can order minimum 5 pieces PCBs for only $2 costs.

To order PCBs, make your Gerber file. Then drag and drop the Gerber file on the following box.

Click on “Gerber Viewer” button you can check the PCBs design. Make sure everything is good, then choose color, quantity and order your PCBs at very reasonable prices.

If you are a new user, then you can order 10 pieces PCBs, costing only $2. To place your order click on “Save to Cart” button. Confirm your shipping address and shipping method.

To order your SMT PCBs, visit JLCPCB.

1.    Drag and drop SMT PCBs file on site.

2.    Choose your PCBs color and quantity.

3.    To free SMT assembly for your PCB click on “SMT Assembly” button and then confirm.

4.    Add your Bom file and CPL file.

5.    Place your order click on “Save to Cart” button.

6.    Confirm your shipping address and shipping method.

7.    Pay your payment

8.    Wait for confirmation mail.

9.    For SMT Service, Click here.

JLCPCB supported all shipping method can be seen below.

Estimated Delivery Time

1. DHL International Express 3-5 business days
2. UPS Worldwide Saver 3-6 business days
3. S.F Express(Standard) 5-8 business days
4. S.F Express(Economy) 8-15 business days
5. Singapore EMS 8-15 business days
6. PostLink Registered Mail 15-20 business days
7. ePacket 15-25 business days
8. Registered Air Mail 15-20 business days

JLCPCB supported Payment method.

1.         PayPal
2.         Credit/Debit Care
3.         Prepaid wire transfer

To confirm your order, pay your payment. Then accept PayPal, Credit/Debit Card, Prepaid Wire Transfer. To manufactured your PCBs, it’ll takes about 2 days. DHL will be fastest shipping method to arrive your ordered PCBs at your location.

All PCBs were well packed and quality was really good.

Thanks to JLCPCB for best quality PCBs.