20 Seconds Record/Play back Voice Module

Features:

• Voice Module 20 Sec kit will playback and record upto 20 seconds of voice message.
• Upto 20 Seconds of non volatile voice storage
• Onboard MIC capsule for recording message directly onto the chip
• A stereo socket to record voice from an external audio source
• Easy jumper selection for selecting recording source
• Flashing LED to display Record / Playback of messages
• Direct speaker connection via Relimate/Berg Connector 
• Relimate/Berg type connector for power supply input
•  4 pin small tactile switches for Record and Play function trigger
• Onboard voltage regulator for a regulated supply
• Diode protection against reverse polarity connection of power supply
• Preset for adjusting sampling rate and record level of voice record/play
• Four mounting holes of 3.2 mm each
• PCB dimensions 70 mm x 58 mm

 Circuit Diagram:

Working:

This kit will allow you to record and play a 20 second voice message stored in it. This circuit is based on APR9301 IC from Aplus.The kit includes all components required for the project accept a speaker, power supply and cabinet. Please check the components supplied to you as per the BOM “Bill of Material” listed in this document. The kit PCB is RoHS Compliant and components legends clearly printed on the PCB. The kit provides two ways to record voice message, viz i) via a Stereo Socket marked CN1 on PCB or ii) On board MICrophone Capsule. Jumper marked J1 on the PCB would select either of these two modes for you. On board preset PR1 will adjust the sampling rate of Playback and record option for this kit. One important thing to remember is that , if you increase the sampling rate, the duration of message will reduce and viceversa.

To Record:

To record a voice message on to the Kit, you need to keep REC Switch SW1 pressed. Recording will stop when you release this switch or at the end of the memory location on this IC. LED D1 will indicate a recording in progress.

To Play:

To play the message, just press and release PLAY SW2 marked on the kit. The message would play and stop for the duration it was recorded.
A speaker (8 ~ 16 Ω) is to be connected at at SPK connector marked on the PCB. A supply between 8 ~ 10V DC should be connected at connector marked J2 on the PCB. Polarity is printed on the PCB. This circuit is protected against reverse polarity connection by diode (D2). U2 is a 7805 regulator which provides a regulated supply to the kit. For datasheet of APR9301, please visit the manufacturer's website at www.aplus.com. Please refer to the schematic diagram for the configuration of this board. The kit includes all components required for the project accepts power supply, speaker and cabinet. Please check the components supplied to you as per the BOM “Bill of Material” listed in this document. Component legends and In/Out port pins are clearly printed on the PCB.