[time-nuts] Frequency divider PCB: Current status on"pre-orders", and pointers to documentation.

[Roy Phillips]

Hello David
Thanks for the email/confirmation.
Keep me informed.
Regards
Roy


--------------------------------------------------
From: "Roy Phillips" <phill.r1 at btinternet.com>
Sent: Thursday, March 18, 2010 10:42 AM
To: <david.partridge at perdrix.co.uk>; "Discussion of precise time and 
frequency measurement" <time-nuts at febo.com>
Subject: Re: [time-nuts] Frequency divider PCB: Current status 
on"pre-orders", and pointers to documentation.

> Hello David
> I would also like to order the PCB at the price of £14.50 plus delivery.
> Thank you.
> Roy Phillips.
>
>
> --------------------------------------------------
> From: "David C. Partridge" <david.partridge at dsl.pipex.com>
> Sent: Wednesday, March 17, 2010 6:28 PM
> To: <TekScopes at yahoogroups.com>; <TekScopes2 at yahoogroups.com>; 
> <hp_agilent_equipment at yahoogroups.com>; <TestEquipTrader at yahoogroups.com>; 
> "'Discussion of precise time and frequency measurement'" 
> <time-nuts at febo.com>
> Subject: [time-nuts] Frequency divider PCB: Current status on 
> "pre-orders",and pointers to documentation.
>
>> The current situation is that I have almost enough statements of intent 
>> to
>> get to the magic 50 which will allow a price of GBP14.50 per board plus
>> delivery.   For the avoidance of doubt, this is the price for a bare PCB,
>> not for a kit, and definitely not for a made up board.
>>
>> I intend to "keep the book open" until 18:00 Zulu (UTC or GMT) on Sunday
>> 21st March, I will then count up what I have and order that many boards 
>> (and
>> maybe a few over to get a nice round number).
>>
>> I've received numerous reqeusts for the design documentation, schematic, 
>> and
>> a bill of materials
>>
>> They can all be downloaded from my website, but there's no way (yet) to
>> navigate to them (a round tuit problem).
>>
>> Write up:
>>
>> <http://www.perdrix.co.uk/FrequencyDivider/Frequency%20Divider%202.pdf>
>>
>> Schematic:
>>
>> <http://www.perdrix.co.uk/FrequencyDivider/Frequency%20Divider%202%20Schemat
>> ic.pdf>
>>
>> and BOM:
>>
>> <http://www.perdrix.co.uk/FrequencyDivider/Frequency%20Divider%202%20Bill%20
>> of%20Materials.pdf>
>>
>> The schematic and write up have both been updated today, and the BOM is 
>> new
>> today.
>>
>> For those who worry about SMT soldering, you don't need a reflow oven, it
>> can all be done with tweezers, a small tipped iron, fine solder wire, and
>> liquid flux (or a flux pen).  A good pair of strong reading glasses helps
>> too!   See:
>>
>> <http://www.curiousinventor.com/guides/Surface_Mount_Soldering/101>
>>
>> I've also had questions on part pricing:  Back in 2008, the cost to 
>> populate
>> one PCB using a MAX999, thick film resistors, and standard (X7R) chip
>> capacitors was about GBP28 including Molex headers and SMB sockets.   I
>> don't expect it to be massively different now.   I'm afraid I don't have
>> full parts kits, and the necessary up front costs to do so is more than 
>> my
>> finances allow at present.
>>
>> FWIW, the ADCMP600 is a bit pricier than the MAX999, and is supposed to 
>> be
>> "better", though I'm not sure in what respects it is better.
>>
>> If you want the lowest possible level of phase noise, you would follow 
>> the
>> bill of materials recommendations and use thin film resistors and C0G
>> capacitors in the clock shaper part of the circuit at the very least, but
>> this adds considerably to the cost (for example 100nF C0G 1206 capacitors
>> are about 1 pound each, while an X7R part is only a few pence).
>>
>> Regards,
>> David Partridge
>>
>>
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>
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