Thu May 29 18:41:43 EDT 2014

25 x CA3046 arrived

I hooked up the ref + osc to the matched differential pair.  There is
some temperature sensitivity when touching the package but definitely
better than the ad-hoc thermal coupling gluing the backs of two TO-92
together with crazy glue.  Now checking if there's drift once I leave
it alone.

I did notice that at 2.5mA the V_BE was substantially higher: 750mV as
compared to 670mV for the 2N3904.

So time to move on to controlling the filter.