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Upgrade for the 3-way Display Alarm

Better accuracy using a retrofit RTC

Upgrade for the 3-way Display Alarm
A clock that doesn’t keep good time is annoying. This is especially true if it’s an alarm clock; it may look nice on the bedside table but if it runs too fast or slow then it’s failed in its primary function. There are however, ways the situation can be remedied… here we will show how to retrofit a more accurate and tiny Break-Out-Board (BoB) in place of the 8-pin DIL type DS1302 RTC chip used in many electronic clock designs to provide time information.
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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.

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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

Component list


C1 = 100nF, SMD 0603



IC1 = DS1302, SOIC8

X1 = ASH7KW, 32.768 kHz, SMD



2 x 4-way. round-pin headers, 1/10“, see text

PCB # 180620-1 v1.2

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