Vallon VMH3CS Mine Detector

[mrvon]

Hi Guys
Just to check headphones connect to pin B & D .
Regards

[Ferric Toes]

Hi Guys
Just to check headphones connect to pin B & D .
Regards

If you link F and B then it cuts out the internal speaker. Phones between FB and D. Phones must be piezo unless you use a step down transformer. A 47nF capacitor in series with the high impedance winding gets rid of the 'thump' from the confidence click.

Eric.

[mrvon]

Hi Eric,
I will be using a step down transformer as of your previous post and pictures on page 27.1 question will i have to use the 47nf capacitor as of your post on page 27? If so which side of the transformer should i put it?
Very sorry for asking a very basic question but as stated i am very new to electronics.
Thankyou for your help
Regards
Russell

[Ferric Toes]

Hi Eric,
I will be using a step down transformer as of your previous post and pictures on page 27.1 question will i have to use the 47nf capacitor as of your post on page 27? If so which side of the transformer should i put it?
Very sorry for asking a very basic question but as stated i am very new to electronics.
Thankyou for your help
Regards
Russell

Hi Russell,
The 47nF is connected between pin D and one side of the transformer primary. Pins B and F go to the other primary connection. If you are using the same transformer that I am, the primary is the side with two wires. The phones connect to the centre wire and either of the outer wires on the secondary side. The transformer is not a perfect match for the job, but it is readily available and works fine with the various phones I have.

Eric.

[tifred]

Hi Eric
I use the booster mt3608.
What is the maximum voltage setting output for the Vallon ?
thank
Fred

[Ferric Toes]

Hi Eric
I use the booster mt3608.
What is the maximum voltage setting output for the Vallon ?
thank
Fred

Hi Fred,
What battery voltage are you wanting to boost? The Vallon as it stands runs happily on a 3.7V Li-ion battery. There is a converter in the Vallon that gives +10V and -10V for any input from 3.5V to 5.5V.

Eric.

[tifred]

hi Eric
i use battery li-on 3.7v 32650 5500 mah.
I thought the valllon should be 4.5 v (3x 1.5).
i wanted to use the mt3608 to go from 3.7v to 4.5v or 5v.
Fred

[Ferric Toes]

hi Eric
i use battery li-on 3.7v 32650 5500 mah.
I thought the valllon should be 4.5 v (3x 1.5).
i wanted to use the mt3608 to go from 3.7v to 4.5v or 5v.
Fred

Hi Fred,
The Vallon manual states that D size rechargeable cells can be used which would be 3x 1.2 and they make a charger that connects to the 6 way socket. I run a couple of rebuilt Vallons on 3.7V with no problems and there is no difference in performance to running on 4.5V due to the internal regulated converter.

Eric.

[tifred]

hi Eric
thank you for your reply.


I will post soon the photos of my modified vallon.

Fred

[mrvon]

Hi Eric,
Thankyou for all your help.My Vallon is now running very well with headphones and the sound is spot on I will do some tests on the south east kent beaches with the small coil it came with and see how it performs.I will be using a selection of British coins.gold ring, silver ring etc.I might have a cent somewhere for you US guys lol.
Regards
Russell

[Ferric Toes]

Brothers in Arms

At the back of the first picture is a previously modified Vallon with a new arm rest and ground stand. Also mounted on the stand is a box containing the components to convert the audio for standard phones. The new modification is to incorporate a 11.5in fully submersible coil using a Whites shaft end which makes for a neat job. This fully shielded coil gives an improvement in detection range over the standard Vallon coil and looks more the part for a treasure detector.

In front is the latest rebuild. The 4 pushbuttons on the original control and LED display plate are replaced by (On)-Off-(On) momentary switches. The forward one being + and - and the rearward one C and pinpoint. Labels will be designed shortly to identify all the features. Power is two parallel 3.7V Li-ion cells in the rear box with a 1/4 jack socket for standard phones.

Eric

http://www.geotech1.com/forums/attac...id=40958&stc=1http://www.geotech1.com/forums/attac...id=40959&stc=1

[daverave]

hi eric..a very well done job on both detectors.

[Carolina]

Eric: Very nice. I particularly like the VALLON in the rear. Three different shafts on three different coils would be a quick and easy change say from 8" to 12" to 15". Have you thought of a 8" or 6" coil yet?

Carolina

[dbanner]

Very nice. Saw VMHC3 on ebay $300+ some guy from Poland had a bunch of them to sell, Maybe this is hoax?

[Carolina]

All my VALLON VMH3CS detectors came from Poland TDM ELECTRONICS but much cheaper than that. $200. Higher if you by the pelican case with it. They are all in good condition.

Carolina