Colpitts 1MHz To 20 MHz Crystal Oscillator Circuit
This is a simple Colpitts crystal oscillator for 1 to 20 MHz,
| PARTS LIST | |
| R1 | 220kΩ |
| R2 | 1kΩ |
| C1 | 82pF |
| C2 | 0.001µF |
| C3 | 100pF |
| C4 | 0.01µF |
| C5 | 0.001µF |
| Q1 | 2N3904 |
| XTAL1 | CRYSTAL (1 to 20 MHz) |
This can be easily made from junk-box parts (provided that a crystal is handy).
2N3904 NPN Transistor Pin Configuration
Please send your ideas, which are very important for our success…
#1 by almat on April 24th, 2013
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.
#2 by weelium on April 26th, 2012
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..
#3 by Advantage on April 13th, 2012
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?
#4 by Lawrence Self on June 12th, 2011
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.