Article

Pandora's Sound & Music Box

Recycle an old CD-ROM drive for (triggered) playback

This project was originally conceived for model making applications as a cheap way to provide high quality audio playback in response to a trigger signal (typically from a pushbutton or PIR detector), but we’re pretty sure Elektor readers can find many other uses.The standard low cost solution to creating auto-playback sounds is to use a record/playback chip (say, the ISD25XX series) but these devices are limited to about 3 kHz audio bandwidth, not to mention a lot of hiss and noise, so the sound quality is not the best unless you’re specifically after for voice messages of the Stephen Hawking type.

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Materials

030402-PCB.pdf

030402-11.zip

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Green and Gold members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

The use of our Gerber files is provided under a modified Creative Commons license. Creative Commons offers authors, scientists, educators and other creatives the freedom to handle their copyright in a more free way without losing their ownership.

PCB

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Bill of Materials

Resistors:
R1,R2,R6= 10kOhm
R3,R10,R11,R12 = 1kOhm
R4 = 3kOhm 3
R5 = 6kOhm 8
R7 = 22kOhm
R8 = 33kOhm
R9 = 68kOhm
Capacitors:
C1,C2 = 47µF 16V radial
C3..C6,C9-C14 = 100nF
C7,C8 = 22pF
Semiconductors:
D1=LED, red, low current
IC1,IC2 = 7812
IC3,IC4 = 7805
IC5 = PIC16F871/P, programmed, order code 030402-41
Miscellaneous:
S1-S8 = pushbutton, 1 make contact
S9 = 4-way DIP switch
X1 = 4.000MHz quartz crystal
K1,K2,K3 = 2-way PCB terminal block, lead pitch 5mm
K4 = 40-way boxheader
K5 = power supply plug for CD-ROM drive
PCB, order code 030402-1
Heatsink, e.g., Fisher SK59 (6 K/W)
PIC source code, 030402-11, Free Download
CD-ROM drive