Martin  Oßmann
About the article

A Striking Digital Clock

Cuckoo or chime?

A Striking Digital Clock
Surely not another digital clock? Well this one is simple to build and a bit of a novelty. It strikes every quarter hour and hour, and the sound it makes? Well you could go traditional and choose a cuckoo or a chime; in fact it’s really up to you.
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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.

Download the BOM list
The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.
Component list
R1 = 10kOhm
R2 = 33kOhm
R3–R9 = 330( (or 7-R DIL array)
C1 = 470µF 16V
C2 = 10µF 16V
C3 = 100nF
C4,C5 = 22pF
C6 = 100µF 10V
D1 = 1N4004
LD1–LD6 = 7-segment display, Kingbright type SC56-11SRWA (red)
IC1 = 7805
IC2 = ATmega32P, programmed
T1,T3–T8 = BS170
T2 = BS250
X1 = 16MHz quartz crystal
S1,S2 = push button
K1,K3 = 2-way PCB terminal block
K2 = 3-pin pinheader
40-pin IC socket

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