Your HH board pics

[Charles (Upstate NY)]

I thought it might be fun to create a thread of Hammerhead board pics since quite a number of people are building them. Here's mine, not quite finished, waiting on 100k pots and 47u caps.

[Bill]

Here is my version. I am using the active pulldown option. The fet I am using has quite a low Coss but it is only rated for 3A continuous, so I am mounting it underneath the PCB with a very effeicent sink attached. I used tantalums where needed and all resistors are metal film. I still need to finish my monocoil to calculate R11.

[Rob in KS]

I've got mine stuffed.

Time to put away the soldering iron and get out the scope. I used pin headers for the pots that run externally and for the jumpers. The pins came from old motherboards and the connectors from an old VCR I stripped.

Now I know why I keep all this stuff.

[dan129]

mine

[dan129]

bis

[Functional]

Your HH board pics

I've got mine stuffed.

Time to put away the soldering iron and get out the scope. I used pin headers for the pots that run externally and for the jumpers. The pins came from old motherboards and the connectors from an old VCR I stripped.

Now I know why I keep all this stuff.

Rob in KS

Nice job of improvising there. (I've got an old VCR, a box of old P3 motherboards and video cards, etc.) I'm thinking of trying my hand at one of these PI designs, but I'm not normally an electronics type. This looks a little more involved than soldering speakers and a stereo into a Chevy, but I might just give it a go when I have other matters around here taken care of.

F.

[nelson]

Hammerhead

Hi Carl, can you tell me if you can get gold nuggets with your HH MD?
Also, let me know how much it will cost me an assembled unit, shipped to Chile.
In advance many thanks
Nelson

[Carl-NC]

Hi Carl, can you tell me if you can get gold nuggets with your HH MD?
Also, let me know how much it will cost me an assembled unit, shipped to Chile.
In advance many thanks
Nelson

Hi Nelson,

Yes, the HH will detect nuggets; the question is: how small and how far? This is a case where a fast coil is necessary. I don't have any numbers on gold nuggets.

Sorry, but I don't provide anything but blank PC boards. I just don't have the time to build boards, and could never charge enough to make it a worthwhile endeavor.

- Carl

[joecoin]

Calibrated. Still needs the coil installed and the onboard pots replaced with pin connectors, then into the box she goes!

[Gimp]

I notice most of the boards have trim pots instead of panel mounted pots.

Which pots are recommend as panel mount in order of importance?

R3 - Pulse Width
R42 - Sample Delay
R46 - Sample Pulse Width
R31 - Threshold
R35 - Sensitivity

???

Thanks.

[joecoin]

Check this post:


http://thunting.com/geotech/forums/s...cs+feel&page=2

[Gimp]

I ordered a surface mount board today. For the past week I've been playing with a prototype board.

I'm getting too old for wiring this kind of stuff. I've got the first amp completed with a diode clamp ref for the offset adjustment. I started on the timers but haven't finished them yet. The level shifter transistors are in place..