Eisermann, Phil [Ridg/CO] said:

> Good suggestion. I tried disconnecting the serial cable. The amplifier
> voltage dropped to 0.78V (?) I also tried running the emulator from a
> laptop. the amplifier output is still 5.6V.  However, when I 'reset
> system' then the amplifier output is correct.

OK, I'm almost certain it's the inamp latching up.

It's a power sequence issue. The PIC is momentarily putting current out to
the inamp output, before the inamp is powered up.

One of the reasons I hate emulators!

Cheers,

Bob

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