Hello David, Could you add me to the list for one board please?
regards Paul Reeves G8GJA -----Original Message----- From: David C. Partridge [mailto:david.partri...@dsl.pipex.com] Sent: 17 March 2010 18:28 To: teksco...@yahoogroups.com; tekscop...@yahoogroups.com; hp_agilent_equipm...@yahoogroups.com; testequiptra...@yahoogroups.com; 'Discussion of precise time and frequency measurement' 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 _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. This email, including any attachment, is a confidential communication intended solely for the use of the individual or entity to whom it is addressed. It contains information which is private and may be proprietary or covered by legal professional privilege. If you have received this email in error, please notify the sender upon receipt, and immediately delete it from your system. Anything contained in this email that is not connected with the businesses of this company is neither endorsed by nor is the liability of this company. Whilst we have taken reasonable precautions to ensure that any attachment to this email has been swept for viruses, we cannot accept liability for any damage sustained as a result of software viruses, and would advise that you carry out your own virus checks before opening any attachment. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.