Thursday, February 26, 2015

Circuit Schematic 120 Seconds Voice Record - Play Back using ISD25120

Eltronicschool. - Here is Circuit Schematic 120 Seconds Voice Record - Play Back using ISD25120 like in figure 1 below. The main component of this circuit is IC  ISD25120. This circuit is a message recording board capable of recording 120 secs of audio.

Circuit Schematic

Component List


Circuit schematic like in figure 1 above is Circuit Schematic 120 Seconds Voice Record - Play Back using ISD25120. This circuit is designed around ISD25120 which can store 120 Seconds audio. Recording and playback operations are controlled with tact switches. The kit has an onboard microphone and LED to indicate the functions of Play and Recording. IC has a re recordable non-volatile memory which means that the message will be stored even after the units are turned off and even when it is turned on again.


  1. Input supply - 5 VDC @ 120 mA 
  2. Output - speaker, 16 Ω  
  3. Upto 120 Seconds of non volatile voice storage 
  4. Slide switch for easy selection of Playback / Record mode 
  5. Onboard MIC capsule for recording message directly onto the chip 
  6. Flashing LED to display Record / Playback of messages 
  7. ON Board ON/OFF Switch 
  8. Power-On LED indicator 
  9. Direct speaker connection via Header Connector 
  10. Header type connector for power supply input 
  11. 4 pin small tactile switches for Start / Pause and Stop / Reset 
  12. Four mounting holes of 3.2 mm each
The Original Article : "120 Seconds Voice Record - Play Back"

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