🚀 go-pugleaf

Wayne (wayne@r-node.gts.org) wrote:
: I'm working on a project that requires a switched 14 Mhz oscillator.
: I am currently using a 14 Mhz crystal, a 1M feedback resistor and a
: couple of capacitors on a 74HC00. My problem is that the oscillator
: will occasionally either not start or oscillate at a higher harmonic.
: When it does work the output is also pretty feeble so I know I'm doing
: something wrong.

Hello Wayne,

You wrote too less about your crystal-oscillator. But I believe I see
your problem: The oscillator can not allways start or it starts with
a higher harmonic frequency. The gain is to less with basic crystal-
frequency. Perhaps you have a highpass between the first and second gate
of the 74HC00. In this case, it's possible the cornerfrequency of this
highpass is too high. Another ting, can it bee the 1 M-Ohm resistor
makes with a parasit-capacity a lowpass which also can reduce the needed
gain with basic crystal-frequency?

So I hope I can help you. If have more problems write to my mailbox.
Nice X-Mas 	Thomas