In sci.electronics.design Don wrote:
In sci.electronics.design legg wrote:

snip


If it was designed to use a Callins cap, then Callins
would show up on the schematic and BOM.

As it is, specifying a 6V electrolytic to filter a
6.2V reference is probably a mistake.

Excellent observation! There's actually a 25 V Callins on the board
itself. So, there's definitely a mistake on the schematic.

Whoops, it turns out the (loose) 25 V Callins belongs to another module.
Although the VCO's original 6 V Callins is long gone from my PCB, Inet
images show it present on other people's VCOs.

It also turns out there's a typo with D4. Its correct value is 5.6 V.
By inspection the emitter voltage of Q12 is then determined to be
~ -4.93 V, which jibes with the measured drop across C7 of 4.87 V.

Danke,

--
Don, KB7RPU
There was a young lady named Bright Whose speed was far faster than light;
She set out one day In a relative way And returned on the previous night.