Geotech
Print view

Hammerhead

by Carl Moreland

Hammerhead is a Pulse Induction (PI) metal detector. The primary purpose of this design is to provide the experimenter a platform with which to learn the operation of PI. For that reason, all operating parameters are variable through hardware controls, so that the user can test performance for a variety of settings. Hammerhead is not intended to compete with commercial PI detectors in performance; however, the design is very similar to many mainstream PI detectors, so it is possible to get similar performance.

NOTICE: I have no more PCBs for any of the Hammerhead projects. Please DO NOT place orders for these, because I will not be able to process your order. The GERBER files for all the PCBs are also posted below, so you can have one made if you wish. Some PCBs may be available from "Silverdog"... see the forums for more info.

The Hammerhead construction article:

Here is the schematic & placement diagram for Rev D. Please note that the construction article above is valid for the Rev C PCB. Differences are minor; compare with the Rev C schematics below, or visit the forum for more info.

There are three schematics currently available: the full schematic has everything that is laid out on the PC board, including optional components. The "Option 1" schematic is a little simplified, and is set up with VCO audio. The "Option 2" schematic has non-VCO audio. The schematic PDF files also include a parts-placement diagram. These files are for the through-hole PCB:

These are the schematics & parts placement diagrams for the surface-mount PCB. They are almost identical to their corresponding through-hole versions, except that there is no active turn-off option for Q3 (i.e., R7, R8, and R15 are omitted), and Q11 is inadvertently labeled Q4 on the SMT PCB.

Here are the PCB layouts for both Rev C & Rev D, please note that it is 2x. Also the Gerber files for both revs, for those who want to import them into their CAD program for modification:

Click Here for older board revisions.