60W power amplifier

The TDA7294 amplifier module is a monolithic integrated circuit designed for use as an audio class AB amplifier in hi-fi applications. It has a wide voltage range and output current capability, enabling it to supply the highest power into both 4 ohm and 8 ohm loads. With the addition of a handful of parts and a suitable power supply, this module will deliver 50W RMS into 8-ohm with 0.1% THD. The user must supply a heavy-duty heatsink rated at 1.4°C/W. Pin 10 is the MUTE input and pin 9 provides a STANDBY mode. Muting should always take place before standby mode is selected. Connecting these pins permanently to the supply rail ensures that the amplifier comes on immediately on power up. Increasing the time constants R3-C6 and R4-C5 may eliminate any switch-on clicks. The IC has internal thermal protection that causes the mute to cut in at 145°C and switches the amplifier into standby at 150°C. Do not operate the module without a heatsink. The heatsink tab on the TDA7294 IC is internally connected to the negative supply rail. If the module is mounted inside an earthed metal enclosure, then the IC must be insulated from the heatsink. If not, the negative supply rail will be shorted to ground.

POWER SUPPLY

The maximum supply voltage of the IC is +/-40V. However, the maximum dissipation of the IC would be exceeded when using a 4-ohm load at that voltage. Therefore, the supply voltage used should be kept down to a safe +/-30V. The mains transformer used to power the module should be rated at a minimum of 80VA. If two modules are to be run in a stereo amplifier, a common power supply can be utilized, in which case the transformer should be rated at 150VA.

Specifications

Input sensitivity: 1.3V (50W into 8Ω)
Input impedance: 10KΩ
Frequency response: 15Hz - 100kHz
Slew rate: 10V/μs
Output power: 50W into 8Ω (0.1% THD), 82W into 4Ω (0.1% THD)
S/N ratio: 105dBa (1W / 8Ω)
THD (40W into 8Ω): 0.002% (1kHz), < 0.04% (20Hz - 20kHz)
Power Supply: +/-30Vdc

Parts List for Power Amplifier

- R1=180Ω
- R2-3-5=10KΩ
- R4=22KΩ
- R6=680Ω
- C1=1.5μF 63V MKT Polyester
- C2=2.7nF 63V MKT Polyester
- C3-4=100nF 100V MKT Polyester
- C5-6=10μF 63V Electrolytic
- C7=22μF 63V Electrolytic
- C8=33μF 25V Electrolytic
- C9-10=1000μF 63V Electrolytic
- IC1=TDA7294 on Heatsink
- J1=2pin connector with 2.54mm step
- J2=3pin connector
- J3=2pin connector
- JP1-2=2pin Jumper with 2.54mm step

Parts List for Power Supply

- TR1=230Vac//2X22Vac 80VA for single Amplifier
- TR1=230Vac//2X22Vac 150VA for dual Amplifier
- BR1=Diode Bridge >15A
- C1=22nF 630V Polyester MKT
- C2-5=22nF 100V Polyester MKT
- C6-7=10,000μF 63V For single Amplifier
- C8-9=10,000μF 63V For dual Amplifier
- C10-11=1μF 63V Polyester MKT
- F1=Fuse 0.5A slow

This circuit is designed to provide efficient audio amplification while ensuring thermal protection and signal integrity. Proper assembly and adherence to the specifications are critical for optimal performance and reliability.?? ??????? ????? ??? ???????? ?????? ????????? ??? ???????????? TDA7294 ??????????? ??????????, ?? ???? ???? ?????????????? ??? ???. ?? ?????????? ?????? ?????????? ?? ???? ??, ???????????? ?? ????? ????? ???? ?? ?????? 8? ??? 4?. ?? ???? ???? ????????? ????? ??? ??? ???? ??????????? ?????? ?? ????? 50W rms ??? 8? ??? ?????? ????? ??????????? 0.1%. ?????????? ????? ?? ???????????? ?? ??????? ????? ?? ??? ???? ?????? ???????? ?????????? 1,4° C/W ?????????????? ??? ????????? ???????? ????? ????. ???? ????? ?????????? ????? ? ???????? ?????????? ??????????? ??? ??????? ??? ????? ??? ?????????????. ??? ??? ???????????? ???????? ???? ??? ??????? ???? ????? ?? ??? ??????? ?????? ?????? ??? ???????. ?? ???????????? ??????? ????????? ??? ???????????? ???? ????? ?????? ????? ????? 145-150°C, ?????? ????? ??????????? ?? ??? ????????, ??? ?????? Mute ??? Standby ?? ?????? ?? ??? ??????????? ??? ??? ???????????????? JP1-2, ?????????? ???? ?????? ?????? ???????????. ? ?????????? ????? ??? ??????????? ??? ??? ???????? [R3-C6 ??? R4-C5] ??????????? ?????? ???? ?? ?????????? ???????? ??????? ??? ???????? ???? ?? ??????? ??? ???????? ??? ??? ?????? ??? ???????????. ???? ??? ?????? ?? ???????????? ??? ???????? ????? ?? ????? ????????????? ?? ??????. ?????????? ??????? ?? ??? ???????????? ? ???? ??????????? ??? ????????? ???? ?????? ?? ?????? ????? ??? +/-40V. ???? ???? ????? ?? ???????????? ??? ???? ??????????? ??? ??????? +/-30V ?????????????? ???? ????????? ??? ??????? ??????????????, ????? ?????? ??? ????????????? ??????? ??????. ? ?????? ?????? ??? ??? ?????????????? ??????????? ??? ??? ?????? ????? ??????? 80VA ??? ??? ??? ??????? 150VA. ?????????????? ??? ????????? ??? ??????? ???????? ???????? ?? ????? ?? ??? ?????? ?????? ??????????? ?????? ?? ?????????? ????? ??????? 30 ??? 60mA ? ????? ???????? ????????????? ??????????? ??? 10000?F ???????? ?????????? ??? ??? ????? ?????????? ??? ??? ???? ??? ??? ????????. The TDA7294 amplifier module is a monolithic integrated circuit. It is intended for use as an audio class AB amplifier in hi-fi applications. It has a wide voltage range and output current capability, enabling it to supply the highest power into both 4 ohm and 8n ohm loads. With the addition of a handful of parts and a suitable power supply, this module will deliver 50W RMS into 8-ohm with 0.1% THD.

you the user must supply a heavy duty heatsink rated at 1.4°C/W. Pin 10 is the MUTE input and pin 9 provides a STANDBY mode. Muting should always take place before standby mode is selected. Connecting these pins permanently to the supply rail (insert links) ensures that the amplifier comes on immediately on power up. Increasing the time constants R3-C6 and R4-C5 may eliminate any switch-on clicks. The IC has internal thermal protection that causes the mute to cut in at 145°C and switches the amplifier into standby at 150°C.

Do not operate the module without a heatsink. The heatsink tab on the TDA7294 IC is internally connected to the negative supply rail. If the module is mounted inside an earthed metal enclosure then the IC must be insulated from the heatsink. If not, the negative supply rail will be shorted to ground. POWER SUPPLY The maximum supply voltage of the IC is +/-40V. However the maximum dissipation of the IC would be exceeded when using a 4-ohm load at that voltage. Therefore the supply voltage used should be kept down to a safe +/-30V. The mains transformer used to power the module should be rated at a minimum of 80VA. If you want to run two modules in a stereo amplifier you can use a common power supply. In this case the transformer should be rated at 150VA. Source: Quasar Elec. Specifications Input sensitivity 1.3V (50W into 8W) Input impedance 10K Frequency response 15Hz - 100kHz Slew rate 10V/uS Output power 50W into 8W (0.1% THD) 82W into 4W (0.1% THD) S/N ratio 105dBa (1W / 8W) THD (40W into 8W) 0.002% (1kHz) < 0.04% (20Hz - 20kHz) Power Supply +/-30Vdc Parts List for Power Amplifier R1=180ohm C5-6=10uF 63V Electrolytic J2=3pin connector R2-3-5=10Kohm C7=22uF 63V Electrolytic J3=2pin connector R4=22Kohm C8=33uF 25V Electrolytic R6=680ohm C9-10=1000uF 63V Electrolytic All Resistors is 1/4W 1% C1=1.5uF 63V MKT Polyester IC1=TDA7294 on Heatsink All Electrolytic Capacitors is Axial C2=2.7nF 63V MKT Polyester J1=2pin connector with 2.54mm step C3-4=100nF 100V MKT Polyester JP1-2=2pin Jumper with 2.54mm step Parts List for Power supply TR1=230Vac//2X22Vac 80VA for single Amplifier C1=22nF 630V Polyester MKT C8-9=10.000uF 63V For dual Amplifier* TR1=230Vac//2X22Vac 150VA for dual Amplifier C2....5=22nF 100V Polyester MKT C10-11=1uF 63V Polyester MKT BR1=Diode Bridge >15A C6-7=10.000uF 63V For single Amplifier F1=Fuse 0.5A slow

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