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

December 6th, 2023

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).


Electronics Schematic Diagram alarm Door Bell circuit using NE555 part 1

December 6th, 2023

Electronics Schematic Diagram alarm Door Bell circuit using NE555
Electronics Schematic Diagram alarm Door Bell circuit using NE555

The main part of this doorbell circuit are two NE555 timer ICs.When some one presses switch S1 momentarily ,the loud speaker sounds a bell tone as long as the time period of the monostable multivibrator built around IC1.

When the switch S1 pressed, IC1 is triggered at its pin 2 and output pin 3 goes high for a time period previously set by the values of POT R4 and POT R5.

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