Sorry for the very tardy response!
Using the 18F2550.
Looking at power consumption the HF itself is about 15ma, the serial display I use is about 15ma and the PIC/opamp and schmidt trigger is about 32ma for a total of around 62ma.
I have had two chances to use it so far, the predictions of object and depth are not great in real life. The readouts of delta phase and delta volts do allow for a quick determination of whether to dig or not but I may have gotten lucky, the HF analog discriminator is quite sensitive and accurate. The unit does have one potentiometer (of two inside the HF unit) that can adjust the discriminator baseline. Anyone with one of these that say it 'loves' iron just needs a tweak of the pot :-)
The pic monitoring does allow me to detect more than the HF circuit itself but PIC ground balance to get the higher sensitivity needs to be performed often as terrain changes.
Gene
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