Original device

[Gervm]

Look to the circuit of this unit. First you may think that it is not metal detector - child toy. You are wrong. It`s underwoter device for lakes. And its search head enough unusual. More details or no?

[detectoman]

fine my brother, very intersting, please most details on these, and very thanks in advance
dman

[detectoman]

any body can put conversion complements to occidental denominations? please

[Gervm]

Indeed it is rather serious device designed by engeneer for divers. It works good in sweet water as in lake, river ect. The sircuit has large description on bad russian so i`ll do slowly. For begining look to the plastic search head... It is not a toy...

[Gervm]

2-case of search coil
6-case of generator
7-capasitor C2
9-control for C2

[Gervm]

I think so looks better.

[Gervm]

Detector can be used as in water as on land. For compact using was designed ferrite search coil with unusual winding of turns. Look on my picture.

[Gervm]

This is case for generator or oscilator of search head that connected to the case of coil

[Gervm]

If you looking for lager objects you can use loop coil with diametre 300mm. In this vatiant device can detect larger object 2 times deeper.

[Gervm]

Do you need other details?

[detectoman]

yes gervm this detector is marvelous, i need all details what you can give us on these, this is one beauty original old tipe, i like to collection of rare jewel, thanks brother

[detectoman]

any things i not understand how these superior case for? ? adjustables calibratores? on ? what is 4 what 8 what is 10? are, adjusting little nucleous core? where trepasing cable to ferrite ? guag i need most details jhaja my mind is whit my jaina waw

[detectoman]

waw! these have adjusting inside coil, waterproof, these capacitor 9 is adj, round? any picture? any photo? thanks gervm these is sensacional!

[detectoman]

gervm, what is frecuence of cristal?

[Gervm]

Author used in this unit cristal at 1350 kHz but write that wanted to use 500kHz or lower but he did not find so part. He also write that you must not use cristal with frequency higher than 1500kHz. He advises not stick the turns of ferrite coil by glue. You have to use fore this purpouse paraffin especially on high frequency. Better use cristal in glass or plastic case - minimum metal parts near the search head. Looking on the construction I supose that it will be work fine and more stable at frequency 100-500kHz. Use also a stabilizer of suply - 78L09 or other.