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Understanding Nanotechnology

Project 9.1 The Colpitts Oscillator

This is the support page for the Colpitts Oscillator project in Complete Electronics Self-Teaching Guide with Projects.

Parts List:

The following list provides links to suppliers that sell components needed for this project. These links are intended to make finding the parts a little easier for those of you new to electronics. However most parts needed to build these projects can be obtained from various suppliers, you should chose the supplier best for you.

• Resistors
  • One 10 kΩ, 0.25-watt resistor.
  • One 510 Ω, 0.25-watt resistor.
  • One 82 kΩ, 0.25-watt resistor.
  • One 8.2 kΩ, 0.25-watt resistor.
• Two 1 µF capacitors (This value of capacitor is available in either polarized or unpolarized versions. You should get unpolarized capacitors for this application.)
• One 0.1 µF capacitor.
• One 0.22 µF capacitor.
• One 4.7 µF capacitor. (This value of capacitor is usually polarized, which is fine for this position in the circuit.)
• One 0.5 mH inductor. (Suppliers may also refer to this value as 500 µH.)
• One oscilloscope.
• One PN2222 transistor.
• One breadboard
• One terminal block
• One battery snap connector
• One 9 V battery

Datasheets:

• PN2222 datasheet

Photos:

Project 9.1 Breadboarded Colpitts oscillator circuit with feedback to the emitter

Project 9-1 Oscilloscope attached to Colpitts oscillator circuit

Project 9-1 The sine wave generated by the Colpitts oscillator circuit # 1

Project 9.1 Adjusted oscilloscope controls

Project 9-1 Breadboarded Colpitts oscillator with feedback to base (circuit #2)