toss one on the pile for me .. -pete
Pete Lancashire [email protected] On Wed, Mar 17, 2010 at 11:28 AM, David C. Partridge <[email protected]> wrote: > 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 > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
