Colpitts harmonic oscillator 100Mhz


Posted on Aug 14, 2012

L1C1 are selected to be resonant at a frequency below the desired crystal harmonic but above the crystal`s next lower odd harmonic. C2 should have a value of 30-70 pF, independent of the oscillation frequency. There is no requirement for any specific ratio of C1/C2, but practical harmonic circuits seem to work best when Cl is approximately 1-3 times the value of C2. Diodes D1-D3 provide a simple regulated bias supply


Colpitts harmonic oscillator 100Mhz
Click here to download the full size of the above Circuit.

The resistance of Rl should be as high as possible, as it affects the crystal"s in-circuit Q.




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