PICKINI V4 - an easy to build, self adjusting PI detector

[Goaty]

"Necessity is the mother of invention!"

[Goaty]

This version has only one SMD componment. Here is mine :
[ATTACH]39945[/ATTACH]
Here is the modified lay file, i've added the prog pins and the board works fine in my underwater detector.
[ATTACH]39946[/ATTACH]

Would it be possible to provide a B&W jpg or pdf of just the copper please.
Also, what are the dimensions of your pcb?

[waltr]

"Sounds great. Any pictures?"

Looks good and great job of making a through hole part form the SMT part.

[Goaty]

Thanks!

My second order of BS170s finally arrived in the post today - it looks like the original order may have gone astray

Now to concentrate on making the waterproof housing for it all.

[popka-ru]

Now to concentrate on making the waterproof housing for it all.

I can recommend. Sewage pipe connector d50. very sealed and roomy for such board dimensions, with batteries. as well as stubs to them.
compact, airtight, cheap and aesthetic!

[popka-ru]

here is a trial assembly. and does not work like the others. power connected different. power supply to 15v, power supply from computer 12v. accumulators 3х18650. and no changes in the work. sensor 100mm 40 turns shielded with aluminum foil. without shielding it works the same way. all the details correspond to the scheme, or anything not changed. what could be the reason?

[ripsdevala]

Noob way.... check ur bs170, there is some with reversed pin, check your lm318, when the ic is defect, the md will not work as it should.

[popka-ru]

already and checked and changed, the sense of zero. bs170 to 2n7000, the result is the same. LM 318 also changed, or something has not changed.

[F117]

Can you check the DC voltage on all pins, as described at the bottom of this page:
http://users.telenet.be/willaert/MD/...ectronics.html


Can you try with a simple coil diameter 20 cm - 26 turns ?

Also: keep the coil away from noise sources - like the PC power supply.
When I try the detector indoors, I put the sensitivity voltage - with the potmeter - to 1V or less.

[popka-ru]

all, I do not want this md !!! does not want to work. all the details completely replaced with new ones. Several times he checked if the seal was correctly made. all came together with the scheme, but still does not want to work, even on the street. all the time constantly ticks, it's not just not convenient and annoying.

[dbanner]

You may have a short on circuit board? Look here:

[dbanner]

No, it looks like that is OK

[dbanner]

Don't use computer power supply? Use battery.

[popka-ru]

there it should be, since it is a common "-" when printed under the loot, the toner fell off a little and had to be brought up. this is the common minus bus. it looks like you do not recognize your own signet.

[dbanner]

You have ground loop on pcb, not good, generate oscillations.