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Polyphonic Doorbell

Several tunes from a PIC 16F84

Polyphonic Doorbell
Music has been defined as ‘the art of combining sounds in a manner that is agreeable to the ear’. We thought would be a nice idea to entrust this delicate task to the best-known microcontroller in the Microchip stable, the PIC 16F84.This circuit, which can serve as a musical doorbell or music generator, is built around a microcontroller, and it can be configured by the user. You’ll be amazed by its virtuosity and the quality of the (polyphonic) sound it produces.As a doorbell, this circuit has several attractive features:– very good sound– eight different tunes– zero current when quiescent– customisable tunes– reasonable construction cost
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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.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list
R1,R2,R3,R6 = 10k?
R4 = 470?
R5 = 1k?
R7-10 = 330?
R11-R22= 100k?
R23 = 1?
P1= 100k? logarithmic potentiometer
C1,C2 = 22pF
C3 = 220µF 10V radial
C4 = 100nF
C5 = 1µF 10V radial
C6-C9 = 4µF7 10V radial
C10 = 22nF
C11,C12 = 22µF 10V radial
C13 = 220µF 10V radial
C14 = 220nF
C15= 100pF
D1 = zener diode 5V1 500mW
IC1 = PIC16F84A-10/P (programmed, order code 020354-41)
IC2 = TDA2006 (Philips)
T1 = BD240
T2 = BC547
LS1= 4? loudspeaker
S1= pushbutton, 1 make contact
X1= 10MHz quartz crystal
9V battery (6F22) with clip-on leads
PCB available from the PCBShop
Disk, all project software, order code 020354-11 or Free Download
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