Crystal oscillator does not seem to work

Thread Starter

Medtech71

Joined Mar 12, 2019
2
Hi I hope somebody can help me, I have built this kit https://tutorial45.com/electronic-project-diy-advanced-clock/ from Aliexpress, great looking kit, but I get symptom of random lights coming up piezo is screaming, and no clock functions at all, I removed the 12MHz Xtal and used a frequency generator to emulate 12MHz, the kit started working properly, replace the 12MHz and still the same issue, the fact that the freq gen worked suggests the circuit is fine and for some reason the Xtal does not oscillate. does anybody have any ideas please. ill upload a schematic when I can find it.
 

AlbertHall

Joined Jun 4, 2014
11,529
There should be two small capacitors, around 20pF, connected to each end of the 12MHz crystal. Make sure they are the correct capacitors, correctly soldered.
 

DickCappels

Joined Aug 21, 2008
7,881
The AT8952 data sheet shows the microcontroller, the crystal and the two capacitors in that circuit. The problem might be that one if those parts is damaged or involved with a soldering problem.

Since the crystal oscillator is a static circuit you can try substituing a crystal of anither frequency if you have one available.
 
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