Jump to content

Recommended Posts

 Have been reading past treads from Steve H., Reg Snift, and others concerning modification that could be added to the TDI, TDI PRO, and TDI SL. One was a Li ion battery pack to up the voltage. I can do that. Another was to change a couple caps (c20 and c21) to .22 mf and change a couple op amps. Sounded like Reg would do some for a price. Then sounded like Reid Mann in Virginia would do them. Then the VP from Whites came on the forum asking for feedback. I forget his name but think he just retired , anyway, his final answer sounded like he would have this mod. incorporated into the new TDI SL future production. This was a year or two back. Now my question, Do you know if this mod. has been installed in the new TDI SL that fedex is supposed to deliver to me tomorrow? If not since I'm a retired electronic tech. I could install myself if Reg had given a little more information. If no one has or are willing to give out, do you know anyone that installs the mod. for a price? Thanks, Joe

Link to post
Share on other sites

I'm afraid I'm not going to be much help, but I can give you some detail on the mods you're talking about. Reg designed these mods for the original and pro TDI's I don't know if he went any further with the SL. I've had two mods installed in my TDI machines, one was to eliminate the threshold warble, drove me crazy in both TDI's and in my GP3500. I now can run either TDI wide open in gain and have a totally smooth threshold. The other mod was to increase sensitivity to small gold I believe it has helped in that regard but have no proof. At the time (two to three years ago) Reg was living in Colorado Springs, he was working with a fellow in Pueblo that was qualified to do the changes and was doing them. I had him do the changes to my machines. It is possible that I still might have his email address. I will have to look for it and it may take some time if I can still find it. To the best of my knowledge Reg never did make the internals of the mods public, however he frequented some of the more technical forums than I did so maybe he did turn them loose. You can PM me if you want me to look for the email address. It will take me a while though as I have changed email services and ISP's since that time and I'm right in the middle of fine tuning a couple of rifles and also doing taxes.

Mike

  • Like 2
Link to post
Share on other sites

The changes to the TDI SL were about increasing the sweep speed, without loss of sensitivity to small nuggets. That was accomplished by changing the aforementioned capacitor values. Here's what Reg posted on this mod.

"The caps being removed are C20 &21, .47uf and will be replaced with .22uf. Use 50v Panasonic, or Rubicon Stacked Metal Film Polyester type." Credit to Reg Sniff

The only other change was increasing the battery voltage to 16.8 volts. There is a small risk of trouble by doing that. The capacitors in the power supply are only rated for 16v. But I don't know anybody that has used the higher voltage that has had problems. I've been using the 16.8v pack for 2 years. It does make a substantial difference in depth and sensitivity.

Jim

  • Like 4
Link to post
Share on other sites
  • 2 months later...

I spoke with Reg many times about making changes to my TDI-SL

We also exchanged many emails, I do still have them. He describes the changes and purpose and also included images of the circuit board and locations. 

Anyone interested can shoot me an email and I will forward. 
I can also copy them and post them here but would like to know if Reg is OK with it first.

Gilbert

gflores71@hotmail.com

  • Like 1
  • Thanks 2
Link to post
Share on other sites

That would be great since all the other TDI forums are getting nuked and blown away. Lots of great info is getting lost or way too hard to find. I appreciate you wanting to make sure that Reg is ok with it before posting though... good man! ?

  • Like 2
Link to post
Share on other sites
23 hours ago, gflores71 said:

I spoke with Reg many times about making changes to my TDI-SL

We also exchanged many emails, I do still have them. He describes the changes and purpose and also included images of the circuit board and locations. 

Anyone interested can shoot me an email and I will forward. 
I can also copy them and post them here but would like to know if Reg is OK with it first.

Gilbert

gflores71@hotmail.com

Thanks for the information.  Interesting information.

 

  • Like 1
Link to post
Share on other sites
  • 3 months later...
On 5/28/2019 at 12:24 AM, gflores71 said:

I spoke with Reg many times about making changes to my TDI-SL

We also exchanged many emails, I do still have them. He describes the changes and purpose and also included images of the circuit board and locations. 

Anyone interested can shoot me an email and I will forward. 
I can also copy them and post them here but would like to know if Reg is OK with it first.

Gilbert

gflores71@hotmail.com

I sent you an email Gil, thanks ☺️

Link to post
Share on other sites
  • 4 months later...

i send you email Gil, thanks 

for the 

I spoke with Reg many times about making changes to my TDI-SL

We also exchanged many emails, I do still have them. He describes the changes and purpose and also included images of the circuit board and locations. 

Anyone interested can shoot me an email and I will forward. 
I can also copy them and post them here but would like to know if Reg is OK with it first.

Gilbert

gflores71@hotmail.com

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Similar Content

    • By Skullgolddiver
      As I mentioned some days ago, I was afraid to have a non waterproof control box after minor works on the coil's cable and the PCB inside.
      The final result of this morning Is been: lot of unstable treshold drift since a few minutes inside the water(no way to calm down the treshold even with GB off).
      Some minor short cause I can see the voltmeter crashed and fuc...d up...
      After almost two hours of terrible noise and a few real signals, nothing to Say but a finally stable treshold without signals at all when targets were under or over the coil...
      This means to me:the coil isn't working anymore...
      Maybe the dumping resistor?
      Maybe the lower resistance due to the cable shortening?
      Nope....The gasket leakage and maybe the connector too.
      I don't even have the time to dismantle again today..🤬🤬🤬🤬
      Pissed as usual 
      Skull
       
       
       
       

    • By havingstl
      I am still need to metal detecting and learning an original tdi.  So lately I have been experimenting with the different controls and how they affect the machine. 
       
      I read some instructions that mentioned running the gain at the point that the threshold remained steady and did not waiver. This typically leaves me with a gain of 3 or 4.  Does this sound right or am I missing something?
    • By GB_Amateur
      I've been experiencing lower yields due to sites being detected, by me for sure and there are also signs by others previously.  SchoolofHardNox's success on a beach using the Minelab GPX 5000 reminded me to re-read Steve's treatise on using the (in his case original big box Pulsescan) TDI for coin detecting.
      I just a few days ago stumbled upon a promising site where extra depth could be key.  It's a schoolyard going back at least to 1955.  Unfortunately as is the case in many of my public sites, it has a history of backfilling.  From aerial photos I see than in the 50's it was grass/sod covered but in the early 60's they put down gravel.  The person who told me about the site (a person who walked up to talk when he saw me hunting a nearby park) said he was a student there 45-50 years ago and at that time it was (again) grass/sod.  I did a one hour survey hunt with the Minelab Equinox (11" coil) and encountered a couple inch thick gravel layer about 5" down.  I did find one Wheatie below the gravel, but 7" is getting deep for my detector + soil mineralization combination so if coins remain from the 50's (pre- gravel layering) then I expect I will do better with extra depth (and that may even be required).
      One thing I've found in my detecting of these older sites -- there are always nails present.  So even if my TDI/SPP can deliver in the coin category it's going to be signalling on a lot of nails.  One of the tricks Steve used was to set the conductivity switch to high conductors (low tones) but the TDI/SPP doesn't have that feature -- I will be hearing both high and low tones.  This is a dual disadvantage -- extra tones to have to mentally tune out but also extra threshold noise since both parts of the signal spectrum will be contributing to that as compared to only half when the conductivity-low switch selection is made (on all TDI's except the SPP version).
      Here are some specific concerns:
      1) Am I fooling myself thinking I can get extra depth with the TDI/SPP, particularly when it comes at the expense of a noisier threshold?
      2) Which coil(s) should I be using (choices I'm considering are 6"x8" Nugget Finder Sadie mono, 7"x14" NF mono, and 12" round White's 'Aussie' mono)?
      3) Should I flag the promising targets but double check with the Eqx 800 (and if so, should I use the 11" or 12"x15" coil on the 800)?  (Note, even if I choose this route I will likely at first dig, regardless of what the 800 says, just to get an idea of what is giving the signal and how deep the targets are.)
      Any other advice (from anyone) is appreciated.
       
       
    • By Skullgolddiver
      I have an easy and maybe stupid question to present now...
      Observing my TDI Bh, with both of the coils I own (the original 12" and the aftermarket Detech 8"), I can clearly see way too long wire around the shaft and I'm forced to make several loops up to the control box near the handle.
      Supposing to measure the right lenght for the maximum extended shaft, and to cut away the hipmount mile long cable.....Am I doing a disaster or not?
      I actually can't remember the technical cable's specs in the amazing pdf Steve posted time ago, but if I'm correct it talked about to reduce some current resistance with a slight performance improvement too...Have I seen a mirage or what?...
      I'm not kidding 😜...
      It's just me, looking for something to play with, suffering for a missed AQ. 
    • By TC-AZ
      This maybe a newbie question but, what is the difference in the 12" Dual Field Coils pictured here other than the black and white labels?  Is one 1st gen. or 2nd gen. or something else?
      Thanks, TC-AZ
       
       
    • By Cascade Steven
      I am interested to learn more about the 7.5-inch mono versus the 7.5-inch Aussie coils that are available for the TDI series.  Is there an advantage of one coil design over the other when hunting for nuggets?  I have the standard 12-inch dual field and also a Super Pulse 150 coil and am curious whether I should add either or both of these coils to my collection?  Or should I purchase one of the new Nugget Finder 8x6 Sadie mono coils?  Any thoughts or advice would be greatly appreciated.
×
×
  • Create New...