IDX-PRO+VDI

[golfnut]

Hello to All NEW AND soy Truth is I did not have much esperiencia, a version if anyone facilitate me Florist, IDX-PRO + VDI complete, I have not much Notions of electronica, but I would like to try the acer IDX-PRO Project + full VDI. Send me one if anyone would be very Thankful yudar, and That in the this forum All information fracionada But this Thanks and porfabor alludarme.

[golfnut]

Hi Barry,

"The whites once getting the ground OK is better on small lead shot "


Probably higher freq machine - so it can see smaller items?



I just modded an ace 250 to 16kHx on an NEL Hunter and it blows the IDX away on small silver

Steve

[golfnut]

The frequency of the Rx signal cannot be changed - the Frequency you Rx is the Tx freq.


The Rx Antenna has a resonant Peak. This cannot be the Tx freq.

It is often in the range 50 to 75% of the Tx freq.


To move this resonant peak about - change the Rx coil capacitor or add or remove turns on Rx coil

[akasyto]

4600 / 6592 = 0.7

70%.

[ampirate]

7908?

Sorry, 7808

[ampirate]

Actually, I found that using a 9V Bat without the VReg by removing and shorting from VReg In to Out,
works better than the 7808 with a 12V Battery (fully charged) - stronger and clearer Speaker output.

Maybe a 7809 VReg would be better ?
- This should not damage anything, that I see.
Any oppinions ?

[ampirate]

Which page explains how to Calibrate this MD ?
I set it up as a D-coil.

All I can configure the MD as a Tone On, that alters with a Coin at 6-inches,
but i can not set the MD up as No Tone that generates tone with a Coin present,

[golfnut]

Actually, I found that using a 9V Bat without the VReg by removing and shorting from VReg In to Out,
works better than the 7808 with a 12V Battery (fully charged) - stronger and clearer Speaker output.


I goofed here too.

The audio section runs directly from the battery, so more volts - more sound power.

------

[Earlier a negative volt reg was mentioned - this was an error ( 7908 ) ]



Maybe a 7809 VReg would be better ?

Whites, as others were and are, always wanting to max max battery life as a selling point - - 8V rather than 9v lets you use the battery for longer as lower battery endpoint with regged 8V. Years ago, the dropout on a 78 reg could be as high as 2.5V - not sure where they are now.. So to ensure 8v you needed MIN of 10.5v, so 12 is handy.

Ive used 24, 18, 12, etc , I have currently a separate reg for Tx and one for the Rx

And honestly cant say there was a lot between them, although sounds more crisp punchy - you wont find any more.

[fabio-evo]

guys there's no way to make it work with 2 tones do not know where mistake or if the circuit does not work, but it 's the second PCB I do, and the last run' this, some of you have ever done and so it worked?

[golfnut]

I thiught the dual tone board silverdog outlets is ok, anyone made one and got it going on IDX???

[golfnut]

If its a silverdog board - it sounds like your stuck in pin point mode.

You may not have fitted the 100k resistor on the cmos switch for PP ... the placement isnt the name as the others ,, the resistor body is vertical and the silkscreen outline is a circle.




If you flip the PP switch or button and the tone stays the same your in PP all of the time as discussed , fit the resistor.

The continous tone is normall PP mode with the VR4 on schematic too high , back it off to no tone then do PP search, thenwhen finished in PP, release PP button or flip switch to other state. PP is not useful with a DD - it is useful with a concentric.



P4 on silkscreen is VR4 on schematic
In PP sets the tone on/off threshold - adjust to just no tone for PP seaches.
In Disc it affects depth perception,, set low user gets quiet for deep, louder for big/close... Set Full -- no change.. all fuller solid note for most targets. Leave full in Disc.

P1 on silkscreen is VR1 on schematic
Is Ground Exclusion Balance (GEB) In Disc, set geb high and bob coil (dont touch ground) it will false. While bobbing, rotate geb anticlkwise to point where falsing just stops. Leave here for this field. Reset in next field, as required.

P7 on silkscreen is P7 on schematic
Disc Rejects things like Iron in clkwise position. At zero allows all metals thru.

P5 on silkscreen is P5 on schematic
Sens - sets the quiet threshold, like a squelch on a radio. Too high and you miss small stuff, too low and chatters

[ampirate]

Also,
I could not find C20, R47, R48 on my Etched Board or the Silkscreen Diagram.

[golfnut]

Build from the pcb in the kit. This way there are no errors

kit says put 100k here - thats what you do - you get a solid working machine.




You will need a cap across your Tx coil -- as its not on the pcb, it has no reference.

It is common to tune up the RX front end with a cap on the pcb - this cap has no pads or reference - builders add it across the Rx coil connection points




The schematic has references which do not get used on the pcb so they are meaningless and random history.

The component VALUES are however important

[ampirate]

Still,
I am only getting between 1 to 2-inch range using a Coin with the Coil.

Is the FREQ Pins needed or Optional ?
- i did not connect this because I diid not see this on most Schematics.

[golfnut]

Is this one you made or a kit from silverdog?