Re: Adding a crystal to my HP-45 Message #4 Posted by Richard Ottosen on 8 Apr 2007, 12:26 p.m., in response to message #3 by Dan W.
I also looked in Digi-Key and Mouser. The closest I came was some ceramic resonators at 800 KHz. These would most likely run the calculator correctly, however, this frequency is not accurate enough for time keeping.
None of the programmable crystal oscillators I looked at were specicfied for less than 1 MHz.
Another possibility is to run a crystal at an overtone. I saw some 153 KHz crystals. If you ran one of these at the 5th (4th?) overtone then you would get 765 KHz. Again, the calculator would work but not for time keeping.
-- Richard
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