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DIY Hobby projects, diagram, schematic

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DIY Hobby projects, diagram, schematic

COLPITTS 1 To 20 MHz Crystal Oscillator

electronicecircuits, March 14, 2010August 17, 2023
COLPITTS 1 To 20 MHz Crystal Oscillator

Colpitts 1MHz To 20 MHz Crystal Oscillator Circuit

This is a simple Colpitts crystal oscillator for 1 to 20 MHz,

Colpitts 1MHz To 20 MHz Crystal Oscillator Circuit

PARTS LIST
R1220kΩ
R21kΩ
C182pF
C20.001µF
C3100pF
C40.01µF
C50.001µF
Q12N3904
XTAL1CRYSTAL (1 to 20 MHz)

This can be easily made from junk-box parts (provided that a crystal is handy).

2N3904 NPN Transistor General Purpose Amplifier
2N3904 NPN Transistor Pin Configuration

Please send your ideas, which are very important for our success…

Electronic Circuits Oscillator CircuitsRF Schematics

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Comments (10)

  1. Lawrence Self says:
    June 12, 2011 at 8:30 am

    Copied your osc. circuit. Colpitts. I intend to use it in a receiver 455 Khz BFO and hopefully make the crystal series capacitor variable to “pull” the frequency through part of the audio range. Should be more stable than the standard L-C layout.

    Reply
  2. Advantage says:
    April 13, 2012 at 2:38 am

    So could I plug the 50mV output of this into an op amp and amplify it? What may be a good amplifier to do that with?

    Reply
  3. weelium says:
    April 26, 2012 at 9:14 pm

    i m having some problem in producing a 1mhz oscillator, if i use the circuit that provided here, can i manage to make it?.. and, i have no idea about it, and in an absolutely troubled situation.. thank you..

    Reply
  4. almat says:
    April 24, 2013 at 6:13 pm

    This schematic is not universal for broad frequency range because it`s purpose is for the natural frequency of the crystal.It can be pulled down only with frequency dividers and also needs precise calculation for different crystals.

    Reply
  5. Baruch Atta says:
    July 12, 2014 at 1:55 am

    @almat – just substitute a parallel coil and cap for the crystal and you will have a variable frequency oscillator.

    Reply
  6. Parth Sane says:
    January 24, 2015 at 11:29 am

    Can the frequency be doubled? I understand this is for the natural frequency. I want to use the second harmonic of 3.579MHz crystal to build a 7MHz frequency source to test my other circuit. Any ideas on how to do that?

    Reply
  7. Manjit says:
    February 3, 2015 at 9:32 pm

    Dlp projector bypass 5pin

    Reply
  8. Dreamer says:
    February 8, 2015 at 11:47 pm

    Is it important to use 2N3904 transistor?
    I’ve build this circuit with BC547 and looks like it works OK, but I don’t know if it could be better.
    http://postimg.org/image/8f3y7n1c3

    Thank you

    Reply
  9. dani r safii says:
    June 8, 2015 at 12:22 pm

    why’d we use that value of capacitors? do you have any calculation or something?

    Reply
  10. Mario says:
    June 29, 2015 at 8:30 pm

    I found it better to remove C2, and make C1=1nF, C3=10nF, and C5=100pF, all other being the same.

    Reply

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