a power_full metal locator

[detectoman]

rajesh: most probable in damaged is the oscilation transistor, (in coil tx), because these suffer extremely work
may be esteban know the solution to these faulth
try the oscilation of tx ( little circuit in the coil ), try the signal to finish the second trasistor of receptor
i am not expert tegnic, but beginer
dman

[Esteban]

No need to be very complicate for to be sensitive.

Is the 8 pins IC a LM358 and the other a 4066? Appears use zener for volt. regulation... seems like a C-Scope model with some variants.

Do you can trace the transmitter circuit inside the coil housing?

Regards

Esteban

[Qiaozhi]

Detech

Have a look here -> http://www.joanallen.co.uk/a_detech_...ectors_uk.html

[Eugene52]

a power full metal locator

Hello , I bet the problem is with the tiny circuit board inside the search-coil and not the windings . There are a lot of circuit tests you can make with just a good ohm meter . You might have a Good Rare VLF Machine that not to many people know about !!.....Keep us informed on your interesting Old Circuit....................Thanks................. ..Eugene52

[rajesh]

metal locator

Hello Rajesh , Looks like a Fun and Great Winter Project !!! It seems like a VLF DD search-coil . Only 2 IC chips and 3 transistors on main circuit board . Let us know how it Goes ?? What are the chip numbers . Might be low frequency , with an oscilloscope you can find out the exact operating frequency . I heard of Detech brand somewhere , Maybe made in the U.K also ??.............Regards.............Eugene52

hi eugene there are a small 8 pin ic lm 358 and - cd 4016 b transister bc 547 i will be send all component list if you need .....

[rajesh]

metal locator

these detector semms circuit very simple
isn't vlf discriminator?

hi detectoman circuit is very simple you are right but this is very sensetive device i used this five year ....

[rajesh]

metal locator

Talk to the manufacturing company, They should help.

hi atul manufacture has a new version more power full cost 29 thousand sensitivity 85 inch at medium object....

[Eugene52]

a power full metal locator

Hello Rajesh , Looks like a Fun and Great Winter Project !!! It seems like a VLF DD search-coil . Only 2 IC chips and 3 transistors on main circuit board . Let us know how it Goes ?? What are the chip numbers . Might be low frequency , with an oscilloscope you can find out the exact operating frequency . I heard of Detech brand somewhere , Maybe made in the U.K also ??.............Regards.............Eugene52

[detectoman]

these detector semms circuit very simple
isn't vlf discriminator?

[Atul Asthana]

Talk to Detech

Talk to the manufacturing company, They should help.

[rajesh]

metal locator

hi any body send me schematic ....

[rajesh]

metal locator

hi every one there was 42 inch senstivity at a medium object.......

[rajesh]

metal locator

there are two 9 volt battry DD coil 7inch any one has a schematic ..

[rajesh]

hi every one i purchase this device for treasure huting in 2003 but now coil winding has been damage