TDI PRO PROJECT COMPLETE

[daverave]

i think pic is ok if you want to get the chip count down...i just prefer to be able to adjust the samples.

[AK48]

8 uS , Have you read this thread? : http://www.dankowskidetectors.com/discussions/read.php?2,21401,22055

[daverave]

you mentioned 8 uS but not sure what your saying ?? can you explain more.

[waltr]

i think pic is ok if you want to get the chip count down...i just prefer to be able to adjust the samples.

I use a PIC processor on my Hammer Head 2 and all timing, pulses and delays, are adjustable.
What I did was put 5k pots on PIC ADC inputs. Then the code reads the ADCs and sets timing.
Most are internal trim pots that are set on the bench but two, Sample delay and GEB, are external panel pots for in the field adjustment.
Of course any could be external for in field adjustment.

To see how to do this check my source code in:
https://www.geotech1.com/forums/show...ake-on-the-HH2

[daverave]

as im not into programming i can only use the old technology...which at the end of the day does the job and still finds treasure.

[MartyJ1963]

Hi Eclipse, Will yu be selling any of the TDI Project boards you are ordering? Thanks, Marty.

[Hamid]

TDI is pure analogue.

[eclipse]

Marty I'll wait for all boards to arrive (in several orders) before I make a final decision on how to proceed. With the current situation with the shipping problems across the globe right now I'd say there is a big chance of seeing no boards at all.
I will use one board to repair a TDI SL which I reverse engineered couple of years back never took the time to put back together. The remaining boards I'm probably going to put into the waterproof boxes like Dave uses and sell them as complete units for the beach, but will see. Truth be told the TDI SL is GoldScan 5 with added simple micro for timings and slightly changed audio section based on 555 & 4066 - nothing that special I don't know why the fuss is all about and how did Whites managed to sell these at 1200 a pop..

[MartyJ1963]

Thanks for the reply Eclipse. I'm not desperate for a pcb but thought that if you do make them available later I would like to purchase one or two from you. I have a lot of projects on the go at the moment but yet I still like to collect as many as I can to build and better my soldering and learning skills. Thanks again, Marty.

[eclipse]

There's no soldering as these are original boards, all soldered, so not exactly what you're looking for. I will have a sellers remorse tbh, if I start selling those piece by piece.
I think slamming them in weather proof box will raise their value significantly without too much effort.

[MartyJ1963]

Thanks Eclipse,,,Keep us posted. Regards, Marty.

[eclipse]

One of the boards I got is off the TDI Pro, after quick check it appears to be very similar type as Goldscan 5 (audio is AD654) but it has a processor for the timings.

I've decided to go forward and reinvent the wheel for the TDI SL. The changes will be introducing new MCU plug-in board upgrade. Old one goes to trash, new FFC connector and board soldered on it's place. Differences with the original would be

A) Reduced initial delay (S1) to 5us for really fast coils.
B) Added auto initial delay (depending on coil and soil conditions a delay will be added on top of the 5uS so the sampling starts at appropriate time always no matter the coil or soil conditions)
C) High power mode - TX_WIDTH knob which allows you to tune the TX with 100-120uS and 120 to 200uS which reduces the frequency range down to 600-800Hz.
This mode would be appropriate to use with larger coil hunting for larger stuff.

All the rest features remain identical.

This would be a commercial upgrade in the 100$ range covered by a lifetime warranty on the MCU board and the TDI board itself /parts cost excluded/...

[eclipse]

Hey dave, is the TDI Pro that you have similar to what I got?
I have few questions about the pots/external connections, maybe you can provide some help if you keep notes.



I've managed to restore the reverse engineered TDI SL finally after sitting in the basement for 3 years!

[daverave]

my tdi's are based on the GS 5 circuit

[eclipse]

OK I know what you mean - the one with the 4538 cct for timing generation.
The one I got is with MCU. What's strange is I noticed 2 audio amplifiers, maybe that needs a closer look.