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Registered Member #3792
Joined: Sun Mar 27 2011, 06:07PM
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Posts: 136
Combining quartz crystals does not work like combining capacitors, resistors or coils. You cannot connect crystals in series or parallel to make them work at a different frequency.
You must find a crystal that it's fundamental oscillating frequency is 450 KHz for the circuit that you specified, since it can't make use of overtone crystals (it will again oscillate at their base frequency).
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
If you build a crystal oscillator and 'square' up the output it will have a very strong 3rd harmonic content which can be filtered out and amplified. The link to crystal oscillator that you posted is just what you want, squarewave output for filtering, amplifying/limiting
Of course, 3x 153 = 459 not 450 and I doubt that you could 'pull' the resonant frequency that far off natural
The crystal frequency is normally the parallel resonance frequency if you make a crystal oscillator using series resonance the frequency will be a little lower
sometimes you can put a filter in the crystal oscillator to force the crystal to operate at it's third harmonic crystals for this purpose are 'overtone' crystals but a normal crystal should work in overtone mode.
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Combineing crystal for high freqency
