Amplifier circuit stereo audio with good power, using integrated circuit TDA7293 for up to 2x 100 Watts. With Suggested PCB mounting design. Includes power supply to the circuit itself, thus only requires a transformer to power. PCB compact size even being single sided. Allowing mount a power amplifier and compact with good quality, ideal for various applications.
Includes power supply on board, only requires a transformer to power the circuit.
The part of the power supply uses bridge rectifier, large electrolytic capacitors to filter values can be used since the 4.700μF to 12.000μF. The LEDs in series with the resistor and indicate on state, serve to discharge the electrolytic capacitors.
Includes circuit mute / stand-by, but was not placed key to turn on and off, is to avoid clicks in the speakers on and off, being unnecessary to use the relay output.
The power transformer can be from 18-0-18 to 33-0-33 / 200VA, with transformer with lower voltage may need less current too
The integrated circuit body should be insulated from the heatsink using mica or plastic thermal pad to insulate the screw.
Schematic stereo audio amplifier with TDa7293
Suggested PCB layout
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List of components for assembly of audio amplifier with TDA7293.
|Resistor’s 1/4 Watt* 5%|
|R1, R2, R10, R11||22K – Red, Red, Orange, Gold|
|R3, R13||680 – Blue, Grey, Brown, Gold|
|R4, R14||27k – Red, Violet, Orange, Gold|
|R5, R15||100k – Brown, Black, Yellow, Gold|
|R6, R12*||2.2 – 1 Watt- Red, Red, Gold, Gold|
|R7, R16||33k – Orange, Orange, Orange, Gold|
|R8, r9||4.7K – Yellow, Violet, Red, Gold|
|C1, C4, C8, C10, C12, C13, C16, C20||100nF – capacitor polyester|
|C2, C14||1µF – capacitor polyester|
|C3, C7, C15, C19||22µF/50V – electrolytic Capacitor|
|C5, C6, C17, C18||10µF/50V – electrolytic Capacitor|
|C9||4.700µF to 10.000µF/50V – electrolytic Capacitor|
|C11||4.700µF to 10.000µF/50V – electrolytic Capacitor|
|D1, D2||1N4148 – Diode|
|IC1, IC2||TDA7293 – Audio amplifier integrated circuit ST Microelectronics|
|B1||GBU15G or equivalent – Bridge rectifier|
|LED1, LED2||red LED 3mm|
|Description of the connectors|
|AC||Connector to the transformer – 18-0-18 to 33-0-33|
|INL||Left channel audio input|
|INR||Right channel audio input|
|OUTL||Left channel audio output|
|OUTR||Right channel audio output|
|Welding, Wire, Printed Circuit Board, Box, connectors, transformer, heat sink, etc..|
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