ELYAPIMI PLL DEDECTOR

[cnckecgo]

http://depositfiles.com/files/8xw6yn2z2

http://depositfiles.com/files/qkslykbt6

http://www.youtube.com/watch?v=9e14GzwkWI4

coil 13 cm diameter rx 0.25 coil 50 turn tx 0.35 coil 50 turn 18 khz frequency dedector
http://www.dosya.tc/server25/fbOvlw/yepyeni2.rar.html

[ivconic]

Umut verici!
...
Promising!

[Tepco]

This is not PLL design at all, but VLF with PLL phase generation. Interesting and promising, looks like good design. 3 channel machine, probably some sort of ratio-metric GB employed, or 3 ch. disc. Or some combination of. Not alike similar Russian designs, i will have to retrace it completely. Coil seems to be ~10 in, actually two 13cm DD halves. Very nice.

[Davor]

I'm missing a schematic here. There must be a way to produce a proportional tone with this rig...

[6666]

That depositfiles website is a pain to get files from
and you can only get one file every 10 minutes,
could you please attach the files as attachments to your posts here at geotech , and they will download fast , thanks

[ivconic]

...

[ivconic]

I took freedom to make some trivial changes, for example: instead NE5532 i used 2xNE5534 etc...
Such changes doesn't affect nor disturb original idea and setup.
Cheers!

[cnckecgo]

[Davor]

...

Oh dear

[ivconic]

Oh dear

???

[eduardo1979]

2 Tones

Here is mine. A month ago I've drawn and now I will test it. Hope it works well. Greetings.

[ivconic]

Here is mine. A month ago I've drawn and now I will test it. Hope it works well. Greetings.

Nice work!
I see differences.
I was in doubts about some wirement also.
Especially there at BC639.
Luckilly that part is easy to correct even later on prepared pcb.
Have you made pcb?
I don't like the long one so i made my own, bit smaller.
Cheers!

[cnckecgo]

very sensitive for small target 0.35 gr 12 cm 2.5 gr electron coins 25 cm

[nelson]

So if it can detect a 0.35 gr object at 12 cm, this must be good for gold nuggets?

[scs]

Weak generator and high gain. Only for light soil .