Delta Pulse

[STAVROSNU]

CERTAINLY NO !

[liudengyuan]

A 4093 can replace the two 4538?

[kt315]

schematic and BOM file

[kt315]

ASAT is working perfect, sound is always gone to zero and this is automatic process.
Koliaj did not shield boxes, he did not know that its very necessary for the stability.

[eclipse]

KT, I used Hammond aluminium enclosure, so it's not plastic.

Many people have noticed the "drift" of the threshold not just me, even Коляй (Koliaj) made attempt to change the whole SAT/AUDIO section - you can read his post if you want.

[kt315]

no pics - no matter - no problem. DP is most stable detector in the world replicated in thousands pcs.

[kt315]

People
Threshold is always unstable (drifts) and pin-pointing with frame is anything but easy.

i would like to look on how you did shielded screen inside your enclosure. give me pics.

[kt315]

i tested voltage indicator again and changed RR values. so now it tuned on edge 11.4V-11.6V.
look schematic.

http://www.geotech1.com/forums/album.php?albumid=89&attachmentid=40719

i will do a video later.

[eclipse]

People prefer the easy way (asking for help and not try to debug). If you're going to build a metaldetector (or whatever) people are missing the main point - learn something new.
And best way to learn is trial - error. Some people don't try too hard. Otherwise if you're building a metal detector just in order to use it, it maybe better to buy pre-assembled board.
--
BTW I want to share something with you guys. I've built couple of Delta Pulses and worked with 1x1 frame coil on the field.
And I will be honest - I'm not too impressed.
Threshold is always unstable (drifts) and pin-pointing with frame is anything but easy. Smaller coils (<60cm) have way less depth.
Otherwise depth is not too bad on large items on the large coil, which can only be used on open spaces (fields). Forget about forests and bushy areas.

[jladre]

Why does many people keep on complaining about errors. I'm a newbie in electronics and i don't have expensive machine like oscilloscope. BUT i've build most of geotech project her from pcb making until a working machine. Namely the HH, barracuda, surf xx, surf longboard, delta pulse, turkeys delta pulse, felezjoo pi, and tgsl. Most problem I encounter is not in the design but some parts value fitted in wrong place. And also some minor problem can be solve by patienly studying the problem of your board. So what can I suggest to people full of complain is give time to study your problem and collect ideas in the forum because most problem is already been discussed. Don't relay on asking and asking because not all people have time to entertain your problem, they have thier problem too...
If you can get help then its better but if not its great so that you can measure how strong your determination on this project..

[kt315]

The Turk should be here and bears responsibility for his boards. he has to answer on all problems in on-line mode.
nice position to sell boards on ebay and to say 'there is kt315. he can help.'
definitely just opinion.

[steaua581]

sorry, just my opinion. i read trough many posts and projects (on different forums) and it seems things get confusing at times. forum topics reach hundreds of pages if not more. the projects go trough many transformations...and i wonder why those files/updates are not done as the project goes by, a new post (update) has to be posted to get all the right files and the right workable project on the go. You find a file here and a file there at times confusing...especially if someone has not much experience.
in this case...Delta Pulse
Status Working project 100%
Versions: Turkish version (status working ) , other version Kt315 ...B version C version etc
Mods. Dumping value etc. + - improvements
Frequency - change resistor at a, b , c d etc
This way someone might have an idea of a status and whats going on. As a newbie is really hard to take all the forum, try to figure out whats working and whats not. in some cases people end up buying parts build a project and at last they realize it was not a workable project.
in other words a "resume" of the project as everything advances it will help greatly (what we learned so far)...sometimes such topics go on for years.
Definitely, just an opinion...

[kt315]

do you mean the background color of the text, blue color? so this text is not mine written and thats really HTML saved (his site is not more exist, but all info i save in the archive).
if you would asked me i can email it to you, but you are only throwing the reproaches on me.
this text i am not like... not so good technically IMO.

[Toros]

I do not comment on your boards. I have drawn attention to the fact that the file is incomplete. It is also almost unusable. Can not be printed. It can only be viewed on a computer.

[kt315]

i always am giving incomplete information and my boards are trash. and my name is not Eric Foster.

LOL.