Circuit Audio Amplifier with TDa7293
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
List Component
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
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