Free Download PDF TDA7294 IC Second Voice recorder module and Service Manual free download, schematics, datasheets, eeprom bins, pcb


TDA7294 IC Second Voice Recorder Module. Non-volatile multi message recorder using ISD chips. Just change one resistor for longer duration. Standalone operation using just six onboard bottons. Record via built-in microphone or external line in. Speaker and line out connector. SPI interface. 8-24 VDC.

High power, hi-fi quality class AB audio amplifier module using a TDA7294 IC. Provides an impressive 50W RMS into 8 Ohm or 82W RMS into 4 Ohm with only 0.1% THD.

Mute and Standby are brought out to connection pads on PCB. IC has internal thermal protection.

Space is provided on the PCB for mounting a 1.4°C/W heatsink (not provided).

SPECIFICATIONS (±30V supply)
Power Supply ±30V
Input Sensitivity: 1.3V (50W into 8 Ohm)
Input Impedance: 10K Ohm
Freq. Response: 16Hz – 100KHz
Slew Rate: 10V/uS
Output Impedance: 4 – 8 Ohm
Output Power: 50W into 8 Ohm (0.1%THD)
82W into 4 Ohm (0.1% THD)
S/N Ratio: 105dBa (1W/8 Ohm)
THD (40W into 8 Ohm): 0.002% (1kHz)
<0.04% (20Hz – 20kHz)

All components including IC insulation bush, screws, nuts & washers and TO-3 silicon-impregnated insulating washer are provided. Heat sink, speaker, cables and +/-30V power supply not provided. Solder pad connections. PCB: 84x83mm (heatsink area of PCB is 37x83mm but can overhang if required).