IDX-PRO+VDI

[eduardo1979]

selim. Resistor value U2?

Resistor=100K

[shansov]

selim. Resistor value U2?

[Wiltran]

EDU two tone board

Has anyone got the EDU IDX pro two tone board working? Mine works ok for steel- deep tone, but when I try non ferrous such as a penny, quarter or dime I get one half the depth that i got before and terrible static.http://www.geotech1.com/forums/image...milies/mad.gif

[silverdog]

Silverdog, what is resistance of TX and RX windings in your Fisher coil?

I have TX 1mh 6ohm RX 6.98mH 30ohm

[shansov]

eduardo 1979 What are the parameters of the coil ?

[Jose]

I'll measure resistance when I get home tonight

I tried Ivconics 330nF and 33nF, it didn't seem to be right
Is there a scope picture on here somehwere that will help me set RX correctly ?

Hello Silverdodg
Here is a photo of the cancellation coil, my IDX_PRO
RX seems to work best near 90 degrees as in the photo.
16 volts for TX, 2 volts for grid
+ or - 150 mV for RX, 50 mV per grid, pin 6 of 5534.
Greetings Jose

[selim]

idx

http://www.youtube.com/watch?list=HL1324069527&feature=player_detailpage&v=5GMUBa5MJ2k

[silverdog]

Silverdog, what is resistance of TX and RX windings in your Fisher coil?

I'll measure resistance when I get home tonight

I tried Ivconics 330nF and 33nF, it didn't seem to be right
Is there a scope picture on here somehwere that will help me set RX correctly ?

[eduardo1979]

For Fisher 27cm search coils; RX-capacitor=33nF and TX-capacitor=330nF.Regards!

[kliner]

Capas for Fisher

Silverdog
In one of Ivconics mails he says what values of capa to use with the Fisher coil

[mikebg]

Just obtained one of these Fisher coils, I measured TX=1mH RX=6.98mH
How do I calculate the correct caps ?

Silverdog, what is resistance of TX and RX windings in your Fisher coil?

[silverdog]

RX cap can be critical to tune up closely.
Generally it is close to 0.033 (33nF). But if you put just 33nF that will not do.
Better put 22nF + .... in parallel , close to 33nF..
Be patient and give it chance, try to tune it as closest as possible.
Once tuned - hell of detector !
Deepest from all hand made presented here on Geotech forums.. no competition at all!

Just obtained one of these Fisher coils, I measured TX=1mH RX=6.98mH
How do I calculate the correct caps ?

[Fabian]

Fabian you have one little mistake on your board. R3 need to be conected for other side of R4.
Regards

Thanks Strujas, You´re right. I corrected it already.

Regards

[strujas]

Fabian you have one little mistake on your board. R3 need to be conected for other side of R4.
Regards

[Fabian]

4 holes

I like your small dimension board but not the expense of mounting holes. It would be nice to have four holes, instead of two. All user interface board are exposed for mechanical stress due push-button or encoder activities.

I had thought some kind of solution that Andy gave to fix the board. Either way, it was not a big deal to add two small holes more (There´s no more space ). They are asymmetric with respect to the others, but they are there. Now is your problem.

Here goes, with other minor design fixes.

Best regards

Fabian