IDX-PRO+VDI

[Koala]

hi all
i measure all point for voltages whitout coil and are ok
just pin11 lf347 not ziro is about 6.4v , correct?
for measure tx and rx ,where i put my probes of oscope

best whishes

With your TX connected how many volts peak to peak do you have measured with a oscilloscope and ground.

Board was fine for me and others. Post a good quality photo of both sides of your finished board can help.

Most fault have been a wrong value resistor somewhere it's easy to put say a 47k instead of a 4.7k I have done that before now. All the resistors measure okay in circuit with a multi meter except for two that are parallel on the PSU side these measure about half of what they should.

Hope it gets fixed soon.

[paku]

my experiment about coil
measured the inductance TX mH RX mH Shape Corner And coil size The 0.20 .75

[xlev]

Has anyone in Australia built this for gold prospeting? If so, how does it perform in mineralized soil?

[Dixix]

Different PCB versions?

Please Help! I have the IDX kit (from Silverdog) soldered. There were a few parts left (multi turn pot VR3 and 2 diodes - some parts were missing (Resistors).

Now I have found that there is a difference.

The PCB which is displayed in the shop and what i have soldered. Are there different versions?...

This is the PCB which I got (and already soldered):




This is the PCB shown in the shop:




I'm totally confused ....

[mohandes]

Please Help! I have the IDX kit (from Silverdog) soldered. There were a few parts left (multi turn pot VR3 and 2 diodes - some parts were missing (Resistors).

Now I have found that there is a difference.

The PCB which is displayed in the shop and what i have soldered. Are there different versions?...

This is the PCB which I got (and already soldered):

[ATTACH]26834[/ATTACH]
[ATTACH]26835[/ATTACH]

This is the PCB shown in the shop:

[ATTACH]26836[/ATTACH]


I'm totally confused ....

hi ithink it is not new version
please look your bottom copper of your board , if the wire are continue and forgot to perforate them your pcb correct.
please check it (i think this detector have not new version)

[Koala]

Please Help! I have the IDX kit (from Silverdog) soldered. There were a few parts left (multi turn pot VR3 and 2 diodes - some parts were missing (Resistors).

Now I have found that there is a difference.

The PCB which is displayed in the shop and what i have soldered. Are there different versions?...

This is the PCB which I got (and already soldered):

[ATTACH]26834[/ATTACH]
[ATTACH]26835[/ATTACH]

This is the PCB shown in the shop:

[ATTACH]26836[/ATTACH]


I'm totally confused ....

Yes board is different to the one I did. The other diode was original on the right hand edge about 3/4 of the way down now no longer there. I believe eduardo1979 made some improvements which have been incorporated but have seen no announcement to say the boards have changed.

[golfnut]

I think VR3 was originally to set your Disc gate position in time WRT the Tx.

I would imagine Eduardo observed ony limited tune range on this - so made it a fixed resistor.


There was a double diode on the GEB second filter/amp this allowed more signal through befor limiting - a single diode is common now.


It is very confusing, I agree, and I imagine a note on the website saying the PCB, the parts and the Schematic dont line up would forewarn purchasers to opt in or not.

S

[mohandes]

With your TX connected how many volts peak to peak do you have measured with a oscilloscope and ground.

Board was fine for me and others. Post a good quality photo of both sides of your finished board can help.

Most fault have been a wrong value resistor somewhere it's easy to put say a 47k instead of a 4.7k I have done that before now. All the resistors measure okay in circuit with a multi meter except for two that are parallel on the PSU side these measure about half of what they should.

Hope it gets fixed soon.

Rx 18.9volt
TX 1.4volt
please see the below pic and tell me correct or no?about the sens volum and probes of the scope


many thanks

[xlev]

No one knows if its suitable for highly mineralized ground?

[golfnut]

Rx 18.9volt
TX 1.4volt
please see



You made an error here..

The Tx will be the high voltage
The Rx will be the low voltage

You require the scope grounds to attach to the copper around the edge of the pcb.


Te Rx level here should only be milli volts it often better to measure Rx volts at output of the Rx preamp - In this case as much as 200mV peak to peak is ok.

The Tx volts should be between 10 and 20volts peak to peak

Use x10 probes so you load the ciruitry less.

S

[mohandes]

Rx 18.9volt
TX 1.4volt
please see



You made an error here..

The Tx will be the high voltage
The Rx will be the low voltage

You require the scope grounds to attach to the copper around the edge of the pcb.


Te Rx level here should only be milli volts it often better to measure Rx volts at output of the Rx preamp - In this case as much as 200mV peak to peak is ok.

The Tx volts should be between 10 and 20volts peak to peak

Use x10 probes so you load the ciruitry less.

S

i check it
which opamp your mean about the RX coil?
thanks

[mohandes]

hi all and Mr golfnut sorry me i wrote wronge
see my oscope pic
yellow is TX(probe*10) and blue is RX

correct my waves ?
i think just the degrees not 200 between them.how can i adjust them
how can i adjust this detector and where is the pinpoint ?
regards

[mohandes]

hi all guru
I CAN adjust the coils I take foto and need to say me is ok?
first pics show us that coil not adjust and Phase difference near 50 deg.look







second pics when i adjust them , Phase difference 180deg, look



thanks

[golfnut]

DS oo12 looks OK for phase.


Make sure the coil is away from metal items...

If coil output it is really 1.5Volts, Then this is TOO BIG and will saturate the preamp.


I would try and adjust the coil overlap for a smaller voltage.#


If the Rx volts you display is at the preamp output then 1.5Volts is a little too big.

Readjust the coil postion to reduce it.

You may try for the best you can,, then itroduce a small peice of ferrite and move it around the shell to get the best phase and amplitude combination..

200mV or less is perferct and 180 degrees +/-20 seems OK .

S

S

[mohandes]

DS oo12 looks OK for phase.


Make sure the coil is away from metal items...

If coil output it is really 1.5Volts, Then this is TOO BIG and will saturate the preamp.


I would try and adjust the coil overlap for a smaller voltage.#


If the Rx volts you display is at the preamp output then 1.5Volts is a little too big.

Readjust the coil postion to reduce it.

You may try for the best you can,, then itroduce a small peice of ferrite and move it around the shell to get the best phase and amplitude combination..

200mV or less is perferct and 180 degrees +/-20 seems OK .

S

S

merci Mr golfnut
just my speaker have sound (Continue the sound and dont cut)
for explain more about the pics DS0018 ,the yellow is Tx and probe on *10, so this voltage is 15.5 volts
Blue is Rx and probe is *1, and it is 120mv

the sens volume i put 10K (or better put it 100k ???) .can i use op27 instead of ne5534?
regards