Assembling the WB

[Phil Hunter]

> D8, R14 and R36 next, solder U4 pins 12, 13, & 14,
> measure 1.23V on pin 14. Put in R11 and now measure
> 0.45V on pin 14. R23 & D11, 2.50V to Gnd (J12).
> CAUTION: the following voltages will likely change
> later as more parts are stuffed. R10, R20, U4 pins
> 8, 9, & 10, 2.50V on pin 8. R21, R15, U4 pins 5, 6,
> & 7, 2.50V on J8.

Oops, these voltages are in reference to VGnd (J7),
add 4V when referencing to Gnd (J12).

I made some more progress, R31, R35, & R32, U2 pins
4 & 11, and pins 1, 2, & 3, measure 2V pin 1 to VGnd
(J7). R24 & U2 pins 5, 6, & 7, measure 0.45V pin7 to
VGnd. U2 pins 8, 9, & 10, when I stuffed C10, rather
than clip the leads, I shorted them together, measured
2V on pin 8 to VGnd, then cut the leads. U2 pins 12,
13 & 14, pin 14 is "saturated" as high as it can go,
I measured about 2.8V to VGnd. This now gives us
confidence in U2 working as it should, 'cept maybe pin
14. You may want to swap U2 & U4, and remeasure 0.45V
on U4 pin 14 to VGnd for confidence that op-amp is
working.

regards,
phil
(digest)


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