[time-nuts] Method for comparing oscillators
Dave M
masondg44 at comcast.net
Mon Aug 3 23:24:54 UTC 2009
> Date: Mon, 3 Aug 2009 12:36:40 EDT
> From: EWKehren at aol.com
> Subject: Re: [time-nuts] Method for comparing oscillators
<snip>
> My goal is to keep the total material cost below $200. I have received
> valuable suggestions from Bruce, some I am incorporating as long as it
> does
> stay with in the $ 200.00. I am a strong believer in KISS and have almost
> completed the total PC layout. All IC's are DIP! The board is partitioned
> in
> such a way that it can be cut up in three sections or be left as one. Two
> parts are Isolation amplifiers and mixer with all associated circuits the
> third section separating the two sides is the counter. Price quote for
> the
> board is $ 22.00 in fifty and $ 30.00 in ten quantity. When complete and
> tested all information will be made available to every one. The only
> component
> I have trouble buying is the 74 AC 112. Newark has them, but you have to
> buy thousands. Material cost based on part searches is below $ 200.00.
> Let me make clear I am not trying to push the limits of technology but
> take
> a conservative and KISS approach. Many will be able to make meaningful
> tests where the limit will be their sources not the test set up.
> What is missing is the two u Processor choices and the programming. I have
> only limited knowledge in that field. I am looking for some one that is
> willing to perform that task. The proper u Processors need to be picked
> and
> they will have to be programmed. Two of the identical three may be
> something
> like the PIC 1220. Once selected I can complete the board and order
> prototypes. The programming should be simple, but that is easy to say for
> someone
> that never had to do so. Any body willing to help, please contact me.
> Obviously PC software also has to be created, to use the data from the
> five
> counters. Any body that will do the programming will be a recipient of a
> prototype board.
....<snip>
>
> Bert Kehren
Digikey stocks the 74AC112E, and is available in unit quantities for $0.68
USD each. Price breaks for larger quantities.
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=296-4223-5-ND
Dave M
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