Circuit dynamic power amplifier circuit with IC Dmos TDA7294 – bridge 180W or stereo 2 x 80 Watts

This circuit described here uses two cis tda 7294 for use in stereo (2 x 80Watts) or bridge mode (1x 180 Watts), to configure this setting just four jumpers. To facilitate mounting the circuit has power supply attached. The power is kind of simple symmetrical with a bridge rectifier 6A, and two large electrolytic capacitors , 10000μF the 22000μF/50v. This Power supply will for the two modules. The processor is recommended 22-0-22 to 28-0-28 / 5A, depending on the quality of the transformer is recommended at least 6 amps of current.

The TDA7294 is a monolithic integrated circuit in Multiwatt15 package, intended for use as audio class AB amplifier in Hi-Fi field applications (Home Stereo, self powered loudspeakers, Top-
class TV). Thanks to the wide voltage range and to the high out current capability it is able to supply the highest power into both 4Ω and 8Ω loads even in presence of poor supply regulation, with high Supply Voltage Rejection. The built in muting function with turn on delay simplifies the remote operation avoiding switching on-off noises.

Another application suggestion is the BRIDGE configuration, where two TDA7294 are used,  In this application, the value of the load must not be lower than 8 Ohm for dissipation and current
capability reasons. A suitable field of application includes HI-FI/TV subwoofers realizations.

In stereo, all jumpers must be open and the speakers (speakers) are plugged into connectors Lout and Rout and audio input connectors in the Lin and Rin. In the amplifier in bridge mode all jumpers should be closed and the audio output Lout is (+ the speaker) Rout (- the speaker) and audio input will be Lin, Rin will be shorted to ground via JB2.

The main advantages offered by this solution are:
- High power performances with limited supply voltage level.
- Considerably high output power even with high load values (i.e. 16 Ohm).
With Rl= 8 Ohm, Vs = ±25V the maximum output power obtainable is 150 W, while with Rl=16Ohm, Vs = ±35V the maximum Pout is 170 W.

Circuit of dynamic amplifier using tda 7294 – 180Watts bridge or stereo 2 x 80Watts – Click to enlarge

In bridge mode short circuit the jumper JB1, JB2, JB3, JB4.

Suggested printed circuit board (PCB) for mounting circuit dynamic audio amplifier with tda7294 – Scale 1:1

Component side to guide the assembly of the amplifier circuit – Click to enlarge

Component list

Components	Value
Resistors 1/4 Watt 5%
R1,R3,R7,R9,R13	22k – Red, Red, Orange, Gold
R2,R8	680 – Blue, Gray, Brown, Gold
R4,R10	100k  – Brown, Black, Yellow, Gold
R5,R11	27k – Red, Violet, Orange, Gold
R6,R12	47k – Yellow, Violet, Orange, Gold
Capacitors
C1,C3	0.22µF – 100 volts – Polyester film capacitor
C2,C4	10000µF/50v – Electrolytic Capacitors
C5,C7,C8,C9,C13,C14,C15,C18	22µF/35v – Electrolytic Capacitor s
C6,C12	0.560µF – 100 volts – Polyester film capacitor
C10,C11,C16,C17	100nF – 100 volts – Polyester film capacitor
Semiconductors
CI1,CI2	TDA7294 – Integrate Circuit  from ST Microelectronics
D1,D2	1n4148 – Diode
B1	Rectifier Bridge  6A/200 Volts
Connectors
CN1	Connector to trafo  22-0-22 a 28-0-28
CN2	Output Connector left channel (stereo mode) or (+) bridge mode
CN3	Input Connector Left Channel (stereo mode) or Bridge input
CN4	Input Connector Right Channel (stereo mode)
CN5	Output Connector left channel (stereo mode) or (-) bridge mode
Several
J1,J2,J3,J4,J5	Wires – note the current driven it will go through them
JB1,JB2,JB3,JB4	Jumper to switch between the amplifier modes
Transformer 22-0-22 a 28-0-28 / 5 amperes, wires, box, etc.

Download pdf files for amplifier – pcb, silk and tda7294

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