Black sand meter

[kt315]

BFO or an off resonance would be good choice. Also you may try a magnetometer as a somewhat more sensitive instrument for magnetic materials. Point is that all other detectors were developed to reject materials like black sand.

i do NOT keep BFO schematics. be cause its died. if you want something with frequency shaft do Malysh FM.
i have 4.46Gb information now and i can not write whole info on DVD - its overfilled the value.

[Tim]

All very good info thanks chaps. We need a connection after pre-amp, prior to GB, a cold, or shiftable RX. The Discovery circuit uses LM2951 to accurately measure voltage shift- PCB tracks are neeerly visible on the jpg above. By comparing the frontal picture, we have a pot, a slide switch, charge port/LED, transistor, resistors and diodes. Between this and the datasheet headway is being made. By negating the charge circuit components we are closer again, though I am yet to understand why a devoted LED bar/meter was not used...or why a charging circuit would be integrated into a removable/optional circuit ???
Perhaps for my/our purposes the voltage shift/black sand level could be indicated via LM3914 LED driver. Maybe I am confusing/over-complicating/over-simplifying things by suggesting this?

[homefire]

GrowDude gave me a number of those Baron PCB's. I do not have the Black Sand Module. Just the basic pcb's.