How to Make Powerful Amplifier Circuit Using TDA-7297

Are you interested about making a 12v powerful stereo amplifier circuit using a single sound IC? In this article, we will discuss the basics of creating a 12v stereo powerful amplifier circuit. To make this amplifier circuit, we will use several cheap electronics component.

The TDA7297 is a dual bridge amplifier designed for use in stereo amplifiers, car radios, and other audio applications. It can deliver up to 15 watts per channel into a 4-ohm load, or 10 watts per channel into an 8-ohm load.

The TDA7297 requires a few external components to operate, including power supply capacitors, input and output coupling capacitors, and resistors to set the gain. It can drive a variety of speakers, including 4-ohm and 8-ohm loads, and has a built-in mute function.

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.

The final circuit diagram and design can be seen above. We also thank to our sponsor JLCPCB https://jlcpcb.com/RTA for sponsoring us PCB for this project.

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. Those component lists have to been given below.

Component list -

1. PCB by JLCPCB

2. Sound IC - TDA 7297

3. Volume - B 100K

4. Capacitor - 2200µf/ 25v, 47µf/ 25v, 10µf/ 50v

5. Rectifier Diode - 1N 4009

6. Resistor - 1 KΩ, 47 KΩ

7. Audio Input Cable

8. Sound Speaker

9. Power Source - DC 12v

There are several types of amplifier circuits, each with their own characteristics and applications. Here are some of the most common types of amplifier circuits:

1. Class A amplifier circuit

2. Class B amplifier circuit

3.  Class AB amplifier circuit

4. Class D amplifier circuit

5. Tube Amplifier

6. Operational Amplifier (op-amp) circuit

The Design of amplifier circuit along with the PCB layout can be seen above. Power supply included with the circuit. You can use any 12 battery for this amplifier project circuit.

The schematic of heat sensor circuit along with the PCB layout can be seen above.

To make this amplifier circuit we are using TDA-7297 sound IC and the IC contain 15 legs. These 15 legs have 15 different names. The pinout of this sound IC have to been given below.

1no leg - OUT 1+

2no leg -  OUT 1-

3no leg - VCC

4no leg - IN1

5no leg - N.C

6no leg - MUTE

7no leg - ST-BY

8no leg - PW-GND

9no leg - S-GND

10no leg - N.C

11no leg - N.C

12no leg - IN2

13no leg - VCC

14no leg - OUT2-

15no leg - OUT2+

To make this amplifier 1st we connect capacitor with the sound IC. The sound IC contains 15 legs. There are some common connections in these 15 legs. 1st We connect sound IC 3no leg with 13no leg, 4no leg with 5no leg, 6no leg with 7no leg, 8no leg with 9no leg and 11no leg with 12no leg.

Then connect 10µf/ 50v capacitor positive leg with 4no leg of IC and other 10µf/ 50v capacitor positive leg with 11no leg of sound IC.

Now connect 47µf/ 25v capacitor negative leg with 8no leg and it's positive leg with 7no leg of sound IC.

This time we connect 47 KΩ resistor with the circuit. We connect this resistor with 6no and 13no leg of sound IC.

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

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

To control audio, now we need to connect potentiometer with the circuit. We connect potentiometer ground leg with 9no leg of sound IC. Then connect potentiometer audio in left and right side leg with both 10µf/ 50v capacitor negative leg.

For audio source now we need to connect audio input jack with the circuit. We connect audio jack ground cable with 8no leg of sound IC and audio source left and right side with audio Input leg of potentiometer.

Now we need to connect power source with the amplifier circuit.

To make this 12 power supply circuit, we are using 1N 4007rectifier diode. We connect two rectifier diode cathode terminals with anode terminal of 1000µf/ 25v capacitor. For power indicator we are using 5mm LED light.

Now we connect 5mm LED cathode terminal with anode terminal of rectifier diode. Then we connect 1k resistor with anode terminal of LED and resistor’s other terminal with cathode terminal of that rectifier diode.

For input voltage we are using 12.0.12v transformer. We connect this transformer secondary section 12v cable with anode terminal of rectifier diode and transformer (Ground) cable with cathode terminal of voltage regulating IC. Then connect a AC cable primary section of transformer and connect AC cable with (220 ac) voltage.

This time we need to connect power source with the amplifier circuit. We connect power source positive cable with 3no leg sound IC and negative cable with 9no leg sound IC.

Our amplifier circuit is now completely ready for use. Before use, we might need to use heat sink with the sound IC.

Neat and perfect soldering is an important part for all kind of PCBs. Since soldering, you should remember that, there should not be any kind of short circuit connection. After soldering all leg, we cut-off the extra leg of all electronics component.

We also can use liquid PCB cleaner to clean the PCB board.

Our circuit is completely ready for use now. We need to power switch ON and connect audio source with audio input jack, just play music and enjoy the sound of this amplifier circuit.

Again thanks to JLCPCB for best quality PCBs.

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 -

• DHL International Express 3-5 business days
• UPS Worldwide Saver 3-6 business days
• S.F Express (Standard) 5-8 business days
• S.F Express (Economy) 8-15 business days
• Singapore EMS 8-15 business days
• Post Link Registered Mail 15-20 business days
• ePacket 15-25 business days
• Registered Air Mail 15-20 business days

JLCPCB supported Payment method.

• PayPal
• Credit/Debit Care
• Prepaid wire transfer

To confirm your order, pay your payment. Then accept PayPal, Credit/Debit Card, and Prepaid Wire Transfer. To manufacture your PCBs, it’ll take 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.