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40 Second Message Recorder
(With Looping Option)
By Trevor Hennebeck
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What This Kit Does (And How It Works)
  • This kit records up to 40 seconds worth of audio
    • To do so, make sure the switch is on “record” and push the “start” button
    • Then, record your desired message (and push the “stop” button)
    • To play your message, move the switch to “play” and push the “start” button
  • This message can be looped
    • This loop feature is cool because your message can loop endlessly (or until the battery is dead)
    • To do so, switch the switch from “regular” to “loop”
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Why I Chose This Kit
  • Basically, I chose this kit because it is a mini sampler.  You can record bits of dialog, then later sample them in songs, videos, etc
  • This kit also looked interesting and challenging
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Components
  • 2 680R resistors
  • 1 1K resistor
  • 4K7 resistor
  • 2 10K resistor
  • 2 22K  resistor
  • 2 100K resistor
  • 1 470K resistor
  • 4 0.1 Monoblock Capacitors
  • 1 1uF Electrolytic Capacitor
  • 1 4.7uF elcap capacitor
  • 1 100uF elcap capacitor
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Components (Continued)
  • 1 220uf elcap capacitor
  • 2 BC 547 capacitor
  • 1 BC557 capacitor
  • 1 ISD2540 IC
  • 1 28 Pin IC socket
  • 1 1N4148 Diode


  • 2 pole terminal blocks
  • 1 electret microphone
  • 2 hat keyswitches
  • 2 5 mm LED
  • 1 K146 PCB
  • 2 SPDT PCB mounted switches
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Before . . .
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. . . And After
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Difficulty/Problems I Encountered
  • The most challenging part of this project was soldering the 28 pin IC socket
    • This was made difficult because the pins were so close together
  • A problem that I ran into was that the “record” LED doesn’t come on when you record (and it is supposed to)
  • Despite this error, the kit works well