20 to 80 Seconds Voice Record Playback

Rajkumar Sharma
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SKU: EL34002
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This project is a 20 to 80 seconds Voice Record – Playback module based on ISD1740 IC.

Project has been designed to record & playback multi voice massages using Winbonds ISD1740IC. Messages are stored in flash memories made in unique Multilevel Storage Technology (MLS). Circuit provides high quality audio recording and simple operations. Circuit operates in dual mode standalone or micro-controller SPI mode. Onboard tactile switches for standalone mode and 10 (2×5) pin box header connector for SPI mode. 26 to 80 Seconds voice massage recording capacity.

Specifications

Supply 2.4 to 5 VDC (5 VDC @ 100 mA)
26 to 80 Seconds selectable voice recording capacity
Selectable sampling rates 11.5 KHz, 7.8 KHz, 6.4 KHz, 5.3 KHz, 4.5 KHz
Directly drive 8 Ohms speaker or typical buzzer
Analog audio out to driver external audio amplifier
Digital volume control via onboard tactile switch
Dual mode operation stand alone or micro-controller
SPI Interface (4 wire serial interface)
10 (2×5) Pin box header for SPI interface
Full control on memory and analog path configuration audio input, output and mix in SPI mode
Automatic power-down after each operations cycle (standalone mode)
Onboard tactile switch for Record, Play, Erase, FWD, Volume control, Reset and Feed-Through
Onboard power indication, record play indication
Voice message fed in via microphone or analog signal in
ISD1740 provides a PWM class D speaker driver and speaker output simultaneously
100 Years message retention
100,000 Record cycles
Four mounting holes of 3.2 mm each
PCB dimensions 80 mm x 76 mm

Operations

SW1 (Recording)
Push switch for triggering REC function Recording initialized by HL edge of this signal, continues when it stays at L and stops when LH edge occurs or memory is full. In standalone mode, massages are recorded sequentially until end of memory. The location where recording of individual message starts is determine by the internal record pointer. Addressable record and playback operations are accessible only in SPI mode.

SW2 (Reset)
Push switch for triggering reset function – device enter into the initial state and initializes all pointers to the default state without erasing recording massages.

SW3 (Play)
Push switch for triggering the Play function – playback of current massage in memory. Beginning of current massage determined by the internal playback pointer. Short Low pulse start the playback of this massage and next pulse low stop this operation.

SW4 (Erase)
Push switch for triggering the erase function – Erasing the first or last message in memory or global erasing the all message (whole memory). Short Low pulse erases the current message. Holding this input for more then 3Seconds initiates the global erase operations.

SW5 (FWD)
Push switch for triggering the FWD function – Forward operations, advance to the next massage. Short pulse causes. In standby mode advance from current message to the next message (one message forward) and setting the pointer the playback pointer on it. During the playback-halting this process, advancing to the next massage and restarting the playback from beginning.

SW6 (Volume)
Push switch for triggering Volume – Control of audio volume on speaker output, Analog audio output and Aux/Audio output. There are 8 steps of volume control. Default value after power on is maximum. Repeated low pulses decrease the level by 1 step until the minimum value reached and then increase the volume by one step until maximum value reached and so on.

SW7 (FT)
Push switch for triggering the FT function – In stand alone mode, it configures the analog path as feed-through path from ANA IN audio input to Speakers output and Aux Audio output.