IDX-PRO+VDI

[paku]

can i use this converter schematic for convert double 9v+9v battery to 12v on idx

[paku]

yea same like me

[golfnut]

sorry no idea

[paku]

ok Thanks

where can i get this plastic enclosures like this

[golfnut]

now im using 12v battery to run idx
can i use 18v battery for my idx

I think yes the reg can tolerate 18V easily

[Nicolas]

now im using 12v battery to run idx can i use 18v battery for my idx

Hi you can use this shema for 8V

Or you can use regulateur to reduce the votage lm7808

http://www.kounooz.com/up/do.php?id=1084

[paku]

now im using 12v battery to run idx
can i use 18v battery for my idx

[golfnut]

not certain what you ask//

To get regulated 18v requires 21v input minimum as 78xx regs can have a 2.5v dropout.

I have ran my IDX Tx on 18v - you need to cut pcb trace to feed 18 to Tx only. Require to use 8V reg for opamps etc as before.


If that is what u meant

[paku]

i need ask one question ?
can i change 7808 ragulator to 7818 so i just use double 9v+9v = 18v battery the ouput can get 12 v or not

[golfnut]

Dunno looks original whites drwg. The IDX is clever as its a tight cost reduced kit. There are no bells and whistles and everthing is cheap. This was a departure for whites, a lot of their kit had tight specialist filters with non standard resistors in 1% plus rafts of analog and digital HW. I guess the reason was cost. Some tech reasons may have been noise generated when the threshold for turning the lamp may have toggled fast and created noise. Or the lack of hyterisis may have made the lamp 1/2 bright until really low. Carl may be able to ask one of the older gents at whites why.. S

[Koala]

"What version of the Classic did KT315 in post 1799. How does the 3 way toggle work schematics look the similar." answered my own question is a old classic iii that had the three PP3 batteries.

download the manual nothing special with the toggle switch.

Any reason the low battery warning has been dropped from latter models seem like a down grade

[Koala]

Thanks wasn't over worried about the nails just trying to understand whats happening. Grass was dryish but under the soil was very patchy and variable. Some very wet some bone dry your probably right too many signal phases.

Coil should be okay as its a stock 8"

Next job is to make a new DD and add the low battery warning (only 5 components). The first DD I made I don't like. Very deep nearly 40 cm but very unstable. Also too heavy. It likes dry sand though? targets almost deeper than you can dig out.

What version of the Classic did K315 in post 1799. How does the 3 way toggle work schematics look the similar.

[golfnut]

By slowing the swing right down and sneaking up to a 6" rusty bolt that overloads the MD I can easy see 2 pound coin 2" away with a nice clean tone in disc mode.

"Sounds good"


For the nails, Im struggling a bit now, maybe your Rx coil tune frequency could be quite close to your Tx and giving a big phase pull with ferrous?

If yours air tests really well it may be the case - If you suspect the Tx and Rx are almost co tuned try a 1nF in parallel with the existing cap (Assuming your Rx tank is below Tx to start with) to pull it down a bit this may quieten it a bit?

That ground sounds as though its has many variables in it - grass, soil, then stones may be a bridge too far. Uniform flat clean earth is the holy grail here. short dry grass is ok, wet grass and thick clay are horrible.



You will find wet grass a pain as the wet grass has a phase and the soil has a phase and you can only get rid of one.

In your case you would have 3 return signal phases, the grass, the soil, the stone.. plus the rusty nail


I would say the best time for using our kit has nearly passed for this year. A lot of the laser/tesoros dont do well on wet dewy lush meadow grass.


I think even the ML Exploder doesnt like water in behind the coil cover.

S

[Koala]

Thanks again much appreciated for the help.

Some of it has been user error

Been practicing with items I have found. One mistake I have been making is swinging far too fast. By slowing the swing right down and sneaking up to a 6" rusty bolt that overloads the MD I can easy see 2 pound coin 2" away with a nice clean tone in disc mode.

Still don't understand the digging nails with good tone. None give good tone at home. Looks like someone spilt bag. The ground was grass and soil for the top inch or so and loose stones underneath. Cut around three sides of a square and turned the sod over. Rescanned the area and always good tone from the sod. On one target I turned the disc right up and still got good tone. Don't have a pin-pointer yet so wave handful of soil in font of the coil until I get a tone then keep halving till I find the target always a good tone. Now at home none give a good signal. Tried re-wetting the nails still silent in disc? Could it be some kind coating on the nails that's washed into the soil that's the problem? Might take them back and retry.

[golfnut]

"What the best way to set this up I don't have the LCD. Is it just trail and error"

I did air distance test and tried it over full range a few times. It gave me more distance pot at one end and still good iron/ferrite reject and accept of gold silver and bronze.


All large iron is the nemesis it does all of the following...

Maxes the Rx chain and saturates the filter amps into compression especially the GEB Ch (which has the log amp diode function feedback) These have a recovery time..
The transmit phase and or frequency shifts about depending on the mass of the iron. This needs to settle after the kick.
The time response associated with large iron is huge so once energised it shouts back at you for ages - which means you see it from further off.
Currents flowing in ferrous create a magnetic field like an electromagnet so it is a royal pain.


I hear the massive BAM from large iron and you get to hear it on the appraoch and the exit, the tone appears drawn out and you can move your coil over it and nothing much changes - this is large iron.

I hunt in ALL metal, then toggle to DISC on a momentary action switch - If I get this large BAM, I back the coil away until I loose it, (to find its extent) edge the coil in until I just get it again and then go to DISC if I get a crack/snap/sharp blip - its Iron walk away

Also you will detect these from 12" in the air - walk on. GMP does this too. Just get feel for what it is then its less of a problem.

Most good targets will dissapear if the coil is 4" above the ground, so you sense the scale of the items quickly.

Try a toggle switch like this.. search all met then toggle to disc and see if it goes or stays the same.


Switch as drawn, is user defined DISC setting.
Switch down is ALL Metal - simples
S