TDA7294 2.1 TDA7293 2.1 power amplifier circuit

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Amplifier circuit tda7294 2.1 or tda7293 2.1, you can also use TDA7295 and TDA7296 or combine these cis. Uses single amplifier configuration for the satellites and bridged for the bass amplifier or subwoofer amplifier. Complete project including preamplifier with tone control, bass filter with frequency adjustment, power supply, 3 amplifier circuits, and protection circuit using UPC1237 IC and relay.

About 2.1 amplifier circuit using IC TDA7294 2.1 or TDA7293 2.1

Preamplifier circuit.
The signal input goes through p1 for overall volume adjustment, R11/C18 form a low-pass filter to avoid RF in our amplifier. The component values can be changed to suit your need.
IC1A and IC1B form the tone control circuit, with bass-mid and treble adjustment. P4 adjusts the volume of the satellite amplifiers.

Tda7294 2.1 Tda7293 2.1 Power Amplifier Circuit Pre Amplifier
Tda7294 2.1 Tda7293 2.1 Power Amplifier Circuit Pre-Amplifier

Dual operational amplifiers can be used equivalently, but prefer the original and better quality ones.

Subwoofer (Bass) filter circuit.
The signal of this circuit comes before the pre-tone, IC5A forms a buffer if you prefer you can change the resistor to increase or decrease the gain of the signal. Ic5B forms a high-pass filter with a cutoff frequency of about 43Hz and Ic7A low-pass filter with a cutoff frequency of 157Hz, i.e., a band pass from 43Hz to 157Hz. In Ic7B in P5 makes the cut-off frequency adjustment between 54 and 157Hz. P6 makes the volume adjustment of the bass channel. The signal from this stage goes to the subwoofer amplifier formed by IC8 and Ic9.

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Tda7294 2.1 Tda7293 2.1 Power Amplifier Circuit Subwoofer Filter
Tda7294 2.1 Tda7293 2.1 Power Amplifier Circuit Subwoofer Filter

Power amplifier circuit.
Uses the classic configuration for TDA78xx family, and can use TDA7294, TDA7293, TDA7295 or TDA7296. The mute and stand-by circuitry is shared between the 4 cis. The capacitor on the cis input sets the input impedance at 22K and together with the 1uF capacitor forms a high-pass circuit. The subwoofer amplifier is bridged and should be used with loads of 8 ohms or greater.

Tda7294 2.1 Tda7293 2.1 Power Amplifier Circuit
Tda7294 2.1 Tda7293 2.1 Power Amplifier Circuit

Symmetric power supply circuit.
The linear symmetrical power supply circuit uses a rectifier bridge and 6 capacitors from 4,700uF to 10,000uF. The transformer should be able to supply up to 10A per winding when it is 24V voltage. But it can be 12 + 12 to 25 +25V. If you prefer you can use a supply only for the preamplifier circuit.

Tda7294 2.1 Tda7293 2.1 Power Amplifier Circuit Symetrical Power Supply
Tda7294 2.1 Tda7293 2.1 Power Amplifier Circuit Symmetrical Power Supply

Protection Circuit
A protection circuit for the speakers and delay was adopted, using the UPC1237 IC and 2 relays. The power supply for the circuit comes from the transformer, being rectified by D2/D4. The resistor R35 was calculated to be used with a 24V relay.

Tda7294 2.1 Tda7293 2.1 Power Amplifier Circuit Upc1237
Tda7294 2.1 Tda7293 2.1 Power Amplifier Circuit Upc1237

Table of CIS that can be used in our Amplifier 2.1.

CITDA7293TDA7294TDA7295TDA7296
maximum power100W80W60W50W
Maximum power of the subwoofer180W170W100W60W
Maximum voltage in 4 or 8 ohms satellites + 8 ohm subwoofer22 + 22 VAC22+ 22 VAC18 + 18 VAC12 + 12 VAC
Maximum voltage at 4 or 8 Ohms + 16 ohm subwoofer25 + 25 VAC25 + 25 VAC22 + 22 VAC18 +18 VAC

*Symmetrical source, mount 2.1.

Printed circuit board PCB suggestion for 2.1 amplifier assembly with tda7294 2.1 tda7293 2.1

Tda7294 2.1 Tda7293 2.1 Power Amplifier Pcb Componeent View
Tda7294 2.1 Tda7293 2.1 Power Amplifier Pcb Component View
Tda7294 2.1 Tda7293 2.1 Power Amplifier Pcb Top
Tda7294 2.1 Tda7293 2.1 Power Amplifier Pcb Top
Tda7294 2.1 Tda7293 2.1 Power Amplifier Pcb Bottom
Tda7294 2.1 Tda7293 2.1 Power Amplifier Pcb Bottom
Tda7294 2.1 Tda7293 2.1 Power Amplifier Pcb Top Overlay
Tda7294 2.1 Tda7293 2.1 Power Amplifier Pcb Top Overlay

BOM for mounting or amplifier 2.1

Last Update: 05/30/2022 11:43 AM

PartValorDescriçãoQuantidade
Resistors 1/4W
R1, R22, R23, R25, R28, R29, R31, R36, R38, R39, R41, R62, R6310KBrown, Black, Orange, Gold13
R2, R6, R8, R10, R51, R52, R54, R56, R5722KRed, red, orange, gold9
R3, R9, R53, R55680Blue, gray, brown, gold4
R430K or 33KOrange, black, orange, gold1
R520K or 22KRed, black, orange, gold1
R7, R144,7 ohms 1WYellow, violet, gold, gold2
R11, R13, R27, R43, R501KBrown, black, red, gold5
R18, R24, R26, R32, R34, R37, R40100KBrown, black, yellow, gold7
R12, R15, R16, R17, R20, R33, R42, R5947KYellow, violet, orange, gold8
R19, R352KRed, black, red, gold2
R2115KBrown, green, orange, gold1
R303.9KOrange, white, red, gold1
R44, R46, R47, R496.8KBlue, gray, red, gold4
R45200KRed, black, yellow, gold1
R4868KBlue, gray, orange, gold1
R58, R60220 /2WRed, red, brown, gold2
R65220/3WRed, red, brown, gold1
Capacitors
C1, C1647µF/50vElectrolytic capacitor2
C2, C17, C43, C521µF (105)Capacitor film4
C3, C4, C5, C7, C9, C2022µF/50vElectrolytic capacitor6
C6, C8, C67, C68, C69, C704.700uF a 10.000µF/50VElectrolytic capacitor6
C11, C12, C23, C24, C61, C62, C72, C84, C86100nF (104)Ceramic Capacitor4
C14, C15100µF/50vElectrolytic capacitor9
C18, C19120p (121)Ceramic Capacitor2
C21, C22, C30, C75, C7610µ/50vElectrolytic capacitor5
C10, C13, C32, C33, C41, C55, C56, C78100n (104)Capacitor film8
C25, C31, C3647p (47)Ceramic Capacitor3
C26, C372.2n (222)Capacitor film2
C27, C28, C38, C3947n (473)Capacitor film4
C29, C4010p (10)Ceramic Capacitor2
C34, C35220n (224)Capacitor film2
C4210n (103)Capacitor film1
C57, C58, C59, C6010n (103)Ceramic Capacitor4
C44, C65, C66100µ/50vElectrolytic capacitor3
C644.7µ/50vElectrolytic capacitor1
C83, C85220µ/50VElectrolytic capacitor2
C8733µ/50VElectrolytic capacitor1
Semiconductors
D11N4448Signal diode1
D2, D3, D41N4004 or equivalentSilicon diode3
IC1, IC4, IC5, IC7NE5532 or equivalentDual Operational amplifier4
IC2UPC1237IC protector and delay1
IC3, IC6, IC8, IC9TDA7293 or TDA7294, or TDA7295, or TDA7296Audio Amplifier IC4
IC10LM781515V positive voltage regulator IC1
IC11LM7915Positive voltage regulator IC -15V1
Led1Led 3 mmGreen Led1
LED, LED2Led 3 mmRed LED2
B1GBJ3510TB or equivalent1000V 35A rectifier bridge1
Miscellaneous
CN1Connector JST-XH-03 2.54 mm 3 pin or equivalentAudio Input1
OUTConnector KF8500 (Kf7.62) 3 pinStereo audio output1
POWERConnector KF8500 (Kf7.62) 3 pinPower transformer connection1
SUBOUTConnector KF8500 (Kf7.62) 2 pinSubwoofer output1
P1, P2, P3, P447K or 50KDual potentiometer4
P5, P647K or 50KSimple Potentiometer2
K1, K2G2R-2-DC24 or  SMI-24VDC-SL-2CDouble relay 24V 5A2
Solder, Wires, PCB, box, transformer.

Download the material list for this assembly, including the plate in Gerber, PDF, PNG, PS format, and datasheet of the components used.

Download the PCB files
Mirror

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