[time-nuts] FE-5680A Breakout Board. - batch one sold

gonzo . cadbloke at hotmail.com
Thu Jan 12 18:38:19 EST 2012

Hi All, thanks for your interest.
The initial nine boards have all been accounted for, but there has been enough interest to justify a second batch.
I'll let it run a few days to gauge interest and see what size batch to order.
If anyone has suggestions for modifications,feel free to contact me.
I could of course do a larger board with more features, but it then rapidly becomes less universal - comments welcome.

cheers, ian

 On Thu, Jan 12, 2012 at 1:09 AM, gonzo . <cadbloke at hotmail.com> wrote:
 > Hi All,
 > like many on the list I picked up one of the current  batch of cheap FE-5608A's.
 > Not being clear where I would end up using it, I laid
 > out a breakout board to make it easy to play with on the bench, but with the
 > expectation that it would remain attached when I got around to mounting the Rb
 > in a box (or where ever).
 > In summary, I've used two VRegs:
 > -  LM1084Adj for 15V (pin compatible with LM317, but rated for 5A) and an AMS1117-5 for the 5V.
 > - The regs can be fed individually or jumpered to run  the 1117 from 15V. This works, but both regs run fairly hot.
 > - 1PPS and LD are brought out to individual headers.
 > - 10MHz has an SMA.
 > - RS232 is  given its own D9 wired for 2, 3, & 5 (TX, RX, Gnd) for a standard  cable.
 > In the process of laying out the board, I discovered another
 > "undocumented feature" of this batch of '5680A. For reasons unknown, the D9 is
 > 3.5mm (1/8") higher than shown on the data sheet. Normally this would not
 > matter, but I'd positioned the connector on the PCB maintaining the low  profile. Not a big deal, but irritating all the same.
 > Having read
 > several tales of woe resulting in blown components. I thought I'd offer my
 > spare boards in the hope of keeping the smoke where it belongs.  I've got 9
 > remaining PCBs and the last of the components should arrive in a week or  so.
 > The cost for a complete kit is aud$10 and $5 for DX postage. I have no
 > idea what level of interest (if any) there will be, but I can always order
 > more boards if there is a demand.
 > One thing to note is that this board  is designed for the current batch of FE-5680A with the following pinout:
 > 1. +15V (~1800mA cold: ~800mA hot)
 > 2. Gnd
 > 3. Rb Lock (lock = low)
 > 4. +5V  (~85mA)
 > 5. Gnd
 > 6. 1PPS (high until Rb Lock goes low)
 > 7. 10Mhz
 > 8.  RS323-RX
 > 9. RS232-TX
 > Please contact me off list if you are
 > ?interested.
 > Cheers,
 > ian
> > _______________________________________________


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