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Resonator not in top gear....

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granddad

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res09.jpg
I don't remember using a resonator before but the 4093 gates and this 10Mhz device only gave 4.325Mhz. Question .. Is is possible is wrongly marked ? Seems unlikely but no other conclusion....The clock only fed the Z80 during measurement....
RES10.jpg


I am not sure why, but I have on the desk a Z80 and PIC18 as a loader / supervisor project, at first the pic provided Z80 clock, so I could debug easier , but now wanted the Z80 to run at the 10Mhz as ' it said on the tin' , not pursuing the resonator but have adopted a 10Mhz Xtal / 4093 . oscillator instead.
 
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alec_t

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The 4.325MHz was possibly some spurious oscillation frequency due to parasitic components rather than to the resonator. What circuit were you using? Crystal/resonator controlled circuits I'm familiar with generally use normal inverters (e.g. 4049); not Scmitt inverters such as the 4093.
 

granddad

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What circuit were you using? Crystal/resonator controlled circuits I'm familiar with generally use normal inverters (e.g. 4049); not Scmitt inverters such as the 4093.
Hi Alec, perhaps that was my mistake then, I had 2 gates of a 4093 similar to above circuit. thanks.
 

granddad

Well-Known Member
Thanks Alec , don't know what I was thinking... CD4049UB and 10Mhz resonator now showing 9.948Mhz . cheers.
 

alec_t

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That's not bad accuracy for a resonator.
 
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