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

ernieperes at aol.com ernieperes at aol.com
Wed Mar 17 18:37:47 UTC 2010


Hi David,

please put me on the list, I need 1ea PCB board..

My call is HG5ED.

Best regards,

Ernie.

Ps. hope Paypal is OK?







-----Original Message-----
From: David C. Partridge <david.partridge at dsl.pipex.com>
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>
Sent: Wed, Mar 17, 2010 7:28 pm
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
et to the magic 50 which will allow a price of GBP14.50 per board plus
elivery.   For the avoidance of doubt, this is the price for a bare PCB,
ot 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
1st March, I will then count up what I have and order that many boards (and
aybe a few over to get a nice round number).
I've received numerous reqeusts for the design documentation, schematic, and
 bill of materials
They can all be downloaded from my website, but there's no way (yet) to
avigate 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
c.pdf> 
and BOM:
<http://www.perdrix.co.uk/FrequencyDivider/Frequency%20Divider%202%20Bill%20
f%20Materials.pdf>
The schematic and write up have both been updated today, and the BOM is new
oday.
For those who worry about SMT soldering, you don't need a reflow oven, it
an all be done with tweezers, a small tipped iron, fine solder wire, and
iquid flux (or a flux pen).  A good pair of strong reading glasses helps
oo!   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
ne PCB using a MAX999, thick film resistors, and standard (X7R) chip
apacitors was about GBP28 including Molex headers and SMB sockets.   I
on't expect it to be massively different now.   I'm afraid I don't have
ull parts kits, and the necessary up front costs to do so is more than my
inances 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
ill of materials recommendations and use thin film resistors and C0G
apacitors in the clock shaper part of the circuit at the very least, but
his adds considerably to the cost (for example 100nF C0G 1206 capacitors
re about 1 pound each, while an X7R part is only a few pence).
Regards,
avid Partridge

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