TDA7297 – Amplifier circuit add tone control

tda7297 amplifier

TDA7297 – Power amplifier circuit add tone control, simple schematic using the integrated circuit TDA7297 or equivalent TDA7297SA, TDA7266 for audio amplifier. Add passive tone control and volume adjustment. Include PDF, PNG and Gerber PCB

About the circuit with TDA7297

Basic application of the integrated circuit as seen in the datasheet for an amplifier up to 15 + 15 Watts stereo and add tone control. In the diagram, the circuit formed by R10 / C15 and R11 / C16, form a low pass RC filter to about 482 KHz. If you prefer you can change this filter to your liking.

For tone control we have a James Tone Stack circuit, as our components are passive, the adjustment will always be up to 0DB. This signal level will also depend on the impedance of the signal source. If you prefer you can also change this circuit as you wish. You can even use the free Download software Tone Stack calculator software to make calculations easier and simulate the best to your need. If you want you can also see the calculations here on this site. The setting will be for bass and treble. In some cases, depending on the signal level, a preamplifier may be needed, in most applications it is not necessary.

Capacitors C11 and C12 couple the audio signal to the TDA7297 in addition to blocking any DC current. As the input impedance of the TDA7297 is about 30K, we have an RC high-pass filter circuit cut at about 5Hz, using 1uF capacitors. Sufficient for most applications.

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R7, R8 and C9 form the TDA7297 mute and stand-by circuit, using C9 with a value of 100uF, we have a sufficient time constant to avoid the pop when turning on the amplifier.

In our diagram, to power the amplifier will use a 9 to 14 VAC transformer, if using DC source, use jumpers to make the connections in place of the rectifier bridge. We used a large 4.700uF capacitor, which is enough, but if you prefer you can use a 6.800uF capacitor, 2 100nF capacitors were added next to each amplifier’s power pin, for decoupling. For rectification we use a rectifier bridge to make better use of the space.

The board is very compact, in the PCB tracks on the component part (in red), you should use jumpers (piece of wire or component terminal) and thus use single face board. I also added the Gerber file if you prefer to order your board from a PCB manufacturer.

As an equivalent, you can use the TDA7297SA for 10 + 10W and the TDa7266 for 7 + 7W

You must use a heat sink in the CI, if you prefer you can use insulator between the chip and the heat sink, the metal housing is connected to the GND. Isolating will avoid any risk of short circuit.

Diagram  Schematic of the amplifier with TDa7297

Schematic Tda7297 Amplifier
Schematic Tda7297 Amplifier

PCB – printed circuit board suggestion

Tda7297 Amplifier Circuit Pcb
Tda7297 Amplifier Circuit Pcb
Tda7297 Amp Silk
Tda7297 Amp Silk
Component Viewer Top Tda7297 Amplifier Circuit
Component Viewer Top Tda7297 Amplifier Circuit

Parts list to assemble the amplifier

C1, C2, C3, C4, C6, C822n (223)Polyester film capacitor6
C5, C72,2n (222)Polyester film capacitor2
C9100µF/25VElectrolytic capacitor1
C10, C111µF (105)Polyester film capacitor2
C12, C14100nF (104)Ceramic capacitor2
C134.700µF/25VElectrolytic capacitor1
C15, C16220p (221)Ceramic capacitor2
B1KBL608 or equivalent*Rectifier bridge1
IC1TDA7297Stereo bridge amplifier integrated circuit1
LED1Led 5mmLed color to choose1
J1JST-XH-03 – 2.54mm connector 3 pinsAudio input1
J3Terminal Block 2 pinPower – Connect transformer1
J4Terminal Block 2 pinRight channel audio output1
J5Terminal Block 2 pinLeft channel audio output1
Resistors 1/4W
R1, R3, R96k8Blue, Gray, Red, Gold2
R2, R4, R5, R6, R10, R111k5Brown, Green, Red, Gold6
R7, R847KYellow, Violet, Red, Gold2
R12, R131M (Not used)Brown, Black, Green, Gold2
Solder, Wires, Pci, Box, Transformer etc.

* Some equivalent bridge rectifiers
GBU4J, GBP410, KBJ610G, GBU606, GBU808, GBU406, GBU608

Download files for this project, includes Gerber, PNG and PDF files



Datasheet PDF  TDA7297

Datasheet PDF  TDA7297SA

Datasheet PDF TDA7266

See our other project using this same CI – Stereo Power audio amplifier with TDA7297 – 2 x 15 Watts

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About the author blog author. Electronics technician for the technical school of Brasilia - Brazil. Interested in electronics, circuits and technology in general.

3 thoughts on “TDA7297 – Amplifier circuit add tone control”

  1. Hello , nice Project. Where can i buy PCB and Parts. or only PCB?? :-))

    Nice Greetings from Germany .

    Sorry , i can´t fast answer. we make vacation for 14 day.

    VG Ulf


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