• on Audio/Video/Photography
  • Published in issue 4/2004 on page 0
About the article

Pandora's Sound & Music Box

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

Pandora's Sound & Music Box
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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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

R1,R2,R6= 10kOhm
R3,R10,R11,R12 = 1kOhm
R4 = 3kOhm 3
R5 = 6kOhm 8
R7 = 22kOhm
R8 = 33kOhm
R9 = 68kOhm
C1,C2 = 47µF 16V radial
C3..C6,C9-C14 = 100nF
C7,C8 = 22pF
D1=LED, red, low current
IC1,IC2 = 7812
IC3,IC4 = 7805
IC5 = PIC16F871/P, programmed, order code 030402-41
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
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