Dr Ronald Stiffler SEC technology

[TinselKoala]

This info may be useful:

   
• If Tri-state pin is logic "1", then oscillator is connected to the output pin.  Same happens if Tri-state is left unconnected (there's probably an internal pull-up). 
• If Tri-state pin is logic "0", then oscillator is not connected to the output pin, and output is floating.  The fact that it's floating may be useful if you need to switch between several clock sources.  You would enable one of them, and Tri-state the others to prevent contention between multiple outputs.

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[NickZ]

   But, what you really need is the 13.5MHz crystal. Right?
   I tried to post a link to that 13.5MHz crystal oscillator, from ebay, but was unable to do so.

[Slider2732]

Thanks TK, yes the bottom left pin is left disconnected.
I could force it High and see if anything changes, the internal pull-up could perhaps be weak. It's likely 30 years old, I have no new junk stuff.

Yep Nick, all this 27MHz stuff is only cos I personally have no others and I apologise for hogging the thread with it...however, it could be useful learning for correct MHz oscillators.

[NickZ]

   The mentioned buffer amplifier only goes to 5v, max.  If so, that's not enough amplitude to do the trick. And light the leds bulb using capacitance. I think.
    There must be a better solution, to obtain 20v to 25v output at 13.5MHz, or so. As the Doc uses. 

[Slider2732]

Hmm true, I was hoping to drive it at a higher voltage from a cheapo Chinese booster set to 20V. However, it would likely invoke impurities and mess it up.

Have just tried the Enable/Disable and it works as described. It didn't change the frequency at all though. I was hoping that cycling the pin might kick-start something.
Will look for more crystals in the morning.