In need of an Expert!

[Dj1dan]

Hey guys, my names Daniel, first time doing a metal detector but have put other kits together.

Just a few questions for anyone who has time.

I have the Hamerhead Rev d model ordered from silver dog.

I have nearly all the components in place apart from a few the large 402 trim pots (potentiometers), im guessing these are wired into the cuircuit? where do I wire them from?

also im a little confused about some parts, what are the L1/L2, VB, C16, D5 (just any led?), R14, R22,?

Are the empty rectangular boxes to be soldered across? there are no labels/codes across them...

How do I know which way the IC6 (NE5534) etc goes in? Im guessing the circle ontop is the same as the grove?


also im missing (not supplied) R7 3.3k, R2 100k POT , R3 10 k POT, R15 10k, R8 100, R 42 (103) 10k... guessing ill have to run to Jay car or something

I also have a side project that might interest a pro!

thankyou for your time
Daniel

[Qiaozhi]

Since this is a kit of parts from Silverdog, then all the components you need will have been supplied, except coil, batteries and housing. The kit is supplied for the VCO option. Please read the HH article to understand which components are required, and which ones you do not need to fit. The HH is a complex first project to undertake, and you will most likely need an oscilloscope to get it set up properly.

You can determine the correct orientation of the components by looking at the article or the appropriate datasheet.

[Dj1dan]

I have an oscilloscope, also im looking at the sheets provided on this and their website (it seems the document is for a previous model and doesn't match up and is quite confusing), I used the circuit diagrams to put the componets in, and they are the parts that are listed with no values or missing out of the kit (maybe I lost them, but they haven't left a box). Maybe its an extra circuit that isn't actually required, ill reread everything and look for the chip orientation online... thanks.

[Qiaozhi]

The full HH details are here ->
http://www.geotech1.com/cgi-bin/page...head/index.dat
Although the article is for Rev-C, the differences in REV-D are minor.
Here's the REV-D schematic and PCB ->
http://www.geotech1.com/pages/metdet...rhead/HHd1.pdf
The VCO option (which you are attempting to build) is here ->
http://www.geotech1.com/pages/metdet.../HHc2_opt1.pdf

[Carl-NC]

Daniel, if you haven't built a circuit before I don't recommend starting with a metal detector. Play around with some simple opamp circuits first, use a plug-in type breadboard so you can re-use parts. Once you get comfortable with how various parts are used then tackle the HH project.

[Dj1dan]

I think I understand this item now, took me a while! it isn't an easy circuit. As I was attempting to tune R23 in a fully constructed circuit (shorting what needed to be shorted etc) ic2 and probably other things fried haha, think next time I will follow the document and my current board. i think trying to trouble shoot this circuit would be beyond me now that items have fried.

I have in the past completed circuits as complicated as this, for my year 12 physics I put together a voltage regulating circuit that could take 1.5-24 volts, it was for a touch so it could fully drain the battery's. its been years however since ive attempted something this complicated, i do however have other functioning circuits that ive created from scratch (hate paying ridiculous prices for simple circuits i can make), so I wont let this set back deter me. Im not great with multiple potentiometers, and i didn't realise the board was a combination of the rev d and rev c circuit. but think I got a grasp on it now.

Anyone know where I can grab another HH Revd kit? or a proper parts list for the board?

My error, not reading the instructions and doing my research before hand! Thank you guys for your patients and input!
Daniel

[Qiaozhi]

I think I understand this item now, took me a while! it isn't an easy circuit. As I was attempting to tune R23 in a fully constructed circuit (shorting what needed to be shorted etc) ic2 and probably other things fried haha, think next time I will follow the document and my current board. i think trying to trouble shoot this circuit would be beyond me now that items have fried.

I have in the past completed circuits as complicated as this, for my year 12 physics I put together a voltage regulating circuit that could take 1.5-24 volts, it was for a touch so it could fully drain the battery's. its been years however since ive attempted something this complicated, i do however have other functioning circuits that ive created from scratch (hate paying ridiculous prices for simple circuits i can make), so I wont let this set back deter me. Im not great with multiple potentiometers, and i didn't realise the board was a combination of the rev d and rev c circuit. but think I got a grasp on it now.

Anyone know where I can grab another HH Revd kit? or a proper parts list for the board?

My error, not reading the instructions and doing my research before hand! Thank you guys for your patients and input!
Daniel

Hi Daniel,

May I suggest that you first construct the MiniPulse Plus project, before re-attempting to build an Hammerhead. The HH is a great detector, but is hugely complicated for a beginner. You can find the MPP project here -> Minipulse Plus
and kits are available from silverdog -> http://www.silverdog.co.uk/shop/inde...product_id=150
There is a comprehensive Build Document that will make construction a lot easier, and it will provide a solid basis from which to proceed with the HH.
Although there are the Surf-PI and Barracuda projects, in both cases people have struggled (for various reasons) during the construction.
It is important with the MPP to follow the instructions very carefully, and test each section as you go. There is only one on-board adjustment which keeps things simple.

[Dj1dan]

thank you for the advice, i have a barracuda coming to build, ill have a search for the instruction but im hell bent on the hh revd, is silverdog the only supplier?
if i fail at the bara ill grab one. with a hh..

[Dj1dan]

ok changed my mind, ill grab one, thank you. = )