Power amplifier using the TDA7293 chip manufactured by ST Microelectronics, includes schematic and pcb design for easy mounting of the power amplifier. The TDA7293 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 sup-ply the highest power into both 4Ω and 8Ω loads. The built in muting function with turn on delay simplifies the remote operation avoiding switching on-off noises.
Features of the integrated circuit TDA7293
- Very high operating voltage range(±50v)
- Dmos power stage
- High output power (100w @ thd =10%, rl = 8Ω, vs = ±40v)
- Muting/stand-by functions
- No switch on/off noise
- Very low distortion
- Very low noise
- Short circuit protected (with no in-put signal applied)
- · Thermal shutdown
- Clip detector
- Modularity (more devices can be easily connected in parallel to drive very low impedances)
The device is provided with both stand-by and mute functions, independently driven by two CMOS logic compatible input pins.
The circuits dedicated to the switching on and off of the amplifier have been carefully optimized to avoid any kind of uncontrolled audible transient at the output.
The sequence that we recommend during the ON/OFF transients.
The application of figure 5 shows the possibility of using only one command for both st-by and mute functions. On both the pins, the maximum applicable range corresponds to the operating supply voltage.
A little blow circuit audio amplifier IC TDA7293
The assembly is similar to TDA7294, but this IC allows use sources with higher values and thus has a higher output power can reach to 100 Watts.
To mount the circuit we have the suggestion of the printed circuit board with PDF files, and files. SCh and. BRD if you need to edit this layout in Cadsoft Eagle. The red line shown in the drawing of the layout is to make the connection using a piece of wire (jumper).
To use the mute function, simply connect a three-position switch connector on M / ST. A key can be used for panel mounting enclosure and connected by wires to the connector. The link is as follows the thread of the connector means connecting the second born and the wires on the other side borns. The operation is as follows when the key is to GND and the circuit is muted to V + when the circuit starts up. This process has a delay determined by capacitor C5 and C6. If you do not want or do not need to mute just connect the first and second borns or even need to use a connector just make a jumper to connect the dots.
The power supply must be symmetrical as shown in this article, the transformer must be equivalent to 1.5 X Total power amplifier, as this power is related to the maximum input voltage characteristics curves refer to the Datasheet and thus determine the power amplifier to have given power output, and so knowing how your VA transformer should have. The filter capacitors can be used to 22000μF values from 4700μF (for the most demanding).
Scheme for assembly of audio power with TDA 7293
Suggested printed circuit board for mounting the amplifier
Part List for assembly of the power amplifier TDA7293
|Resistors 1/8 Watt 5%|
|R1, R2||22K – Red, Red, Orange, Gold|
|R3||680 – Blue, Gray, Brown, Gold|
|R4||27K – Red, Violet, Orange, Gold|
|R5||100K – Brown, Black, Yellow, Gold|
|R6||33K – Orange, Orange, Orange, Gold|
|C1, C8||1000µF/63 Volts – Polarized electrolytic capacitor|
|C2,C9||100nF/250 Volts – Metalized polyester film capacitor|
|C3||1µF/250Volts – Metalized polyester film capacitor|
|C4, C7||22µF / 63 Volts – Polarized electrolytic capacitor|
|C5, C6||10µF/35 Volts – Polarized electrolytic capacitor|
|IC1||TDA7293 – Dmos Integrated circuit audio amplifier|
|D1||1N4148 – Silicon diode|
|IN||Audio input connector|
|OUT||Audio output connector|
|M/ST||Connector for connecting a mute/standby key|
|PW||Power supply connector|
|Solder, wire, printed circuit board, box, connectors, etc..|
Download Eagle Files for TDA 7293 – .SCH and .BRD
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About the Author: Xtronic.org blog author. Electronics technician for the technical school of Brasilia - Brazil. Interested in electronics, circuits and technology in general.