Monday, June 22, 2015

Circuit Schematic Colpitts Crystal Oscillator by Spiliopoulos Kwstas

Eltronicschool. - There are many kinds of oscillator system that developed to generate signal source. One of the oscillator kind is Colpitts using crystal like in circuit schematic like in figure 1 below. This article based on the article that wrote by Spiliopoulos Kwstas that published in Electronics-lab site.

Circuit Schematic

Figure 1. Circuit Schematic Colpitts Crystal Oscillator 
(Source: Electronics-Lab)

Component Part
  1. Transistor 
  2. Resistors
  3. Capacitors
  4. All component please see in figure 1 above

Description

Circuit schematic like in figure 1 above is Circuit Schematic Colpitts Crystal Oscillator. According the description from Spiliopoulos Kwstas that Firstly, he suggest you to read the article in ARRL Handbook 2015, Chapter 9 - Oscillator Circuits and construction. Then sew a video showing the construction of the Colpitts Crystal Oscillator (with Buffer stage) in this link here.

Thus, he assembled the circuit as "ugly construction" using the same values as video shows. He also try it and it's stable, using 12 Volts from battery source, low current.

Every time he change the crystal values he 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". Please read more this project using link here.


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