IDX-PRO+VDI

[ampirate]

I aiming to build and experiment with the VDI.
But first I need to get the IDX Board functional.

[ampirate]

Silverdog,
Have not seen email from you, I am lostam7.
* We would like to order (1) IDX PRO KIT and (3) IDX PRO PCB Boards.
If you can set that Order please.
Thanks, Lostam7.

[silverdog]

I have just ordered some boards, they typically take 10-14 days to arrive
I'd rather not alter the shop as others may order expecting them to be in stock - if you want to pm me and let me know how many you want we can sort something out

No email received recently ?

[ampirate]

Ok, thanks.
I think we have been trying to order a batch since begining of April.
- And so instead of waiting, we have been working on our own boards ourselves, but with limited success.

When can we order ?
Can we place the order, and await the parts ?
Can you answer via the email that I just sent ?
Thanks !

[silverdog]

IDX will be back - just many things on at the moment
I only ran out last week so you should have been able to order recently
Do I want the sales ? well I'm not a business just a member, more sales enables more projects/stock but less free evening time - tricky balance

[ampirate]

I guess Silverdog is Not supporting IDX Boards anymore.
Me and some metal detecting friends have been waiting to order a batch of Kits for a month now.
But, they are still Out Of Stock on his Website.
We were hoping that he would want the sales - Pity.

[golfnut]

You are using cut up sockets for the transistors ??

They may not be connecting..




If yes..

Pull Q1


Measure base of Q2 wrt Batt -Ve terminal

It should read +0.7volts.



If its still 0.1V ,, Pull the coil off - if you now get 0.7 - your cap is DC short.



If still 0.1v either base resisto wrong value or not connected to 8v

OR

Q2 is wired bad

[Koala]

Full diameter should be 27cm RX plus TX

"TX, I used 35 turns of 0.7mm wire on a 27cm Diam Coil - for DD config, Cap=1uF, 1.4 ohms. " does this mean it's twice a big as it should?

Shape is in the Tesoro TGSL thread

[mohandes]

This is my circuit quandry with TX Oscillator :

[ATTACH]29723[/ATTACH]

Old Coil gives me 2V pp at 300Hz with 1uF Cap.

New Coil gives me 3V pp without Cap (no Freq with Cap).
Coil: 35 Turns at 27mm Diam of 0.7mm Wire.

- Where is the 16V pp at 6.5KHz across the Coil ???

my friend you use +9v , why ???
use +12v and put you results here.you will see 6.5khz in coil connector pin1.

regards

[ampirate]

TX Oscillator Problem

This is my circuit quandry with TX Oscillator :



Old Coil gives me 2V pp at 300Hz with 1uF Cap.

New Coil gives me 3V pp without Cap (no Freq with Cap).
Coil: 35 Turns at 27mm Diam of 0.7mm Wire.

- Where is the 16V pp at 6.5KHz across the Coil ???

OK, Update:

First, New Coil gives me between 9V-20V on Oscilliscope (which only reads up to 10V).
But, No Freq with 1uF Cap.

Second, the Tone disappears to a whisper on the Detector with New Coil,
no matter how I maneuver or flip the Coil.

[mohandes]

I am Testing this Circuit of the Oscillator on a Breadboard and connected the Coil with 1uF Cap,
but I see the same results of 2V pp at 300Hz :

Q1=BC327,
Q2=BC547,
1M,
1.8K,
40R,
2.7K,
2.2nF

Has anybody tested this Circuit on a Breadboard ???
Whats the Magic to get 16V pp at 1.5KHz ?

my friend you should have scope to see waves .
TX = 6590hz
RX= 4680hz
check these points:

[ampirate]

Is the full DD Coil Diameter supposed to be 27cm ?
- Or is each RX and TX Coils supposed to be 27cm Diameter per (which doubles the full DD Coil Size) ??
I made each of RX and TX about 25-26cm Diam.

I just finished a new TX coil exactly 27mm diam with 0.71mm wire of 35 turns,
Tested on the Circuit, it gives 3V pp at 160Hz without Cap,
- and No Freq (less than 0.2V pp) with Cap 1uF.

[ampirate]

I am Testing this Circuit of the Oscillator on a Breadboard and connected the Coil with 1uF Cap,
but I see the same results of 2V pp at 300Hz :

Q1=BC327,
Q2=BC547,
1M,
1.8K,
40R,
2.7K,
2.2nF

Has anybody tested this Circuit on a Breadboard ???
Whats the Magic to get 16V pp at 1.5KHz ?

[ampirate]

Multimeter readings to BAT GND :
V+ = 8V
V- = 0V
1M Resistor to Q2 Base = 8V and 0.14V

Transistors Q1 and Q2 test as connected, and are installed as in Layout Q1 face right and Q2 face left.

[ampirate]

Measuring Resistance across Q2 Base to BAT GND in both directions gives me: 160K and Infinity.
All Resistors test as connected properly: 1M, 1.8K, 2.7K to Q2 and V+,V+,V- respectively.

I replaced the Transistors just in case.
Are these the correct Transistors ? :
Q1= BC327
Q2 = BC547B (in place of BC237)