Colpitts Crystal Oscillator

Spiliopoulos Kwstas   spilkos@windtools.gr     
9656
Project non tested

20150406_173645

 

This project is a Colpitts Crystal Oscillator

Description

Firstly, I suggest you to read the article in ARRL Handbook 2015, Chapter 9 – Oscillator Circuits and construction. Then saw a video showing the construction of the Colpitts Crystal Oscillator (with Buffer stage) here.

Thus, I assembled the circuit as “ugly construction” using the same values as video shows. I try it and it’s stable, using 12 Volts from battery source, low current.

Every time I change the crystal values I had a stable Sine Wane on my Oscilloscope which depends on different crystal values. It is a simple circuit to test crystals on your lab, see photos from Cadsoft EAGLE, the schematic, pcb results also the photos from “ugly construction”

Schematic

Colpitts PCB_1

 

PCB

Colpitts_2

Colppits_1

 

 

Photos

20150406_173712

colpitts_3

PCB

2 Response on “Colpitts Crystal Oscillator

  1. Would this component help me get rid of matching crystals on my rc vehicles? I have several different brands and types ultimately i would like to make one of my transmitters either bluetooth or 2.4 GHz or better. Any suggestions? I want to build it instead ofbuy it for learning purposes as well as it just interests me to be able to understand how and why things work

    1. This is used to test various types of crystals using your oscilloscope enabling them to oscillate at their defined frequency and produce a sine wave at the output. Typical frequency output is 20Mhz

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