[time-nuts] Ebay FE-5680A Rb: Connections and Features

Chris Albertson albertson.chris at gmail.com
Sun Jan 8 18:55:34 UTC 2012


On Sun, Jan 8, 2012 at 7:49 AM,  <GandalfG8 at aol.com> wrote:
> Hi Roy
>
> If your unit is generating an output as you report, without 5  volts to pin
> 4, then I'd leave well alone.
>
> On the current batches of cheaper units, that do require a 5 volt supply to
>  pin 4, they won't lock or provide an output without it.

If you look inside, on some units there is a voltage regulator and on
other units there are bare solder pads where the regulator and some
capacitors would go.    My guess is that if you got the bare pads you
need to supply 5V.   The reverse may not be true, I've read a report
of a regulator that was installed but disconnected.

I think these  FE5680 units were all built to customer specs and each
batch of a few thousand units is different.  I wish there were some
rule that when you change a product to have to change the part number
but there is no such rule




Chris Albertson
Redondo Beach, California



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