[time-nuts] Clock Driver Design

[Bob Camp]

Hi

If you want sine waves with the logic ic's just put Tee filters on the outputs. A simple low Q design will knock the harmonics down > 60 db without messing anything up to much on the IC end.

Bob

On Sep 26, 2013, at 9:40 PM, Angus <not.again at btinternet.com> wrote:

> Hi,
> 
> Square wave outputs can be rather higher maintainance, with the whole distribution system from the PCB design and layout through all the wiring to the terminations and beyond all has to be up to the fast IC's/transitions. 10MHz sine waves are much more forgiving. 
> Square waves are useful for some things, but I tend to avoid them like the plague, or immediately turn them to sine, unless I need them. It just depends what it's wanted for.
> 
> Angus.
> 
> 
> From: "Bob Camp" 
> To: "Discussion of precise time and frequency measurement" 
> Sent: September 27, 2013 12:44 AM
> Subject: Re: [time-nuts] Clock Driver Design
> 
> Hi
> 
> Ok, the SN74LVC1G125 is 35 cents each at Mouser if you buy at least 10 pieces. That's going to be $3.50. LM78L05 is 26.5 cents if you buy 10 pcs. You will need some bypass caps and resistors, I'd assume you already have them. 
> 
> Say you want 10 channels, that's 11 logic id's. At one IC per output that's almost $4 plus the 27 cent regulator. Still under $5 for all the parts. It's roughly $10 if you double up on all the output channels. 
> 
> Do a quickie PCB from any of the usual outfits for $10 or so on a small run / one day turn basis. 
> 
> Total cost without connectors or case < $20 in very small quantities. 
> 
> Bob
> 
> On Sep 26, 2013, at 5:05 PM, "John C. Westmoreland, P.E."  wrote:
> 
>> SN74LVC1G125
> 
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