TDI Schematic

[Mark-VA]

Any TDI schematics floating around?

[waltr]

Yes there are in this forum. Do a search.

[Orbit]

You will not find that ...

[Mark-VA]

Thanks Orbit, I tried for a good deal of time, nothing. Might be illegal to have anyway, I'm not sure.

[kt315]

sorry forum does not have TDI schematic. its sure.

Probably gonna have to contact White's. Ask for Todd in the Service Dept. They generally don't like to give out schematics but for such an old design they might.

I don't think so. Todd at White's is the guy to ask, tmarshall[at]whiteselectronics.com.

[kt315]

TDI_GAIN_VCO_STAGE.pdf

[waltr]

Just searched and I can't find them. The forum search is not great- it will find something but then only tell you it is in a thread- then you need to go through every page of each thread to actually find it. I did get schematics from this forum.
Here are the schematics I have:
NOTE: there are many errors in these schematics. Some of the op-amps have the inverting input swapped with the no-inverting input. These are easy to spot since a feed-back R always goes to the inverting input.

TDI PRO PROTO.pdf

[moorejl57]

Just searched and I can't find them. The forum search is not great- it will find something but then only tell you it is in a thread- then you need to go through every page of each thread to actually find it. I did get schematics from this forum.
Here are the schematics I have:
NOTE: there are many errors in these schematics. Some of the op-amps have the inverting input swapped with the no-inverting input. These are easy to spot since a feed-back R always goes to the inverting input.
[ATTACH]46392[/ATTACH]

Sorry this is off topic but I had the same frustration to the thread level searching and found a solution.

To search with posts as results:
1. select advanced search
2. select search single content tab
3. under additional options at bottom, select posts

[waltr]

Sorry this is off topic but I had the same frustration to the thread level searching and found a solution.

To search with posts as results:
1. select advanced search
2. select search single content tab
3. under additional options at bottom, select posts

Thanks. I will try to remember to use this for searches.

Did find the posting of the TDI schematics. It is in this thread:
https://www.geotech1.com/forums/show...=TDI+PRO+PROTO

That is also why it is very hard to find specific info, info in threads not related to title.

[Mark-VA]

Thanks for the information. Real interesting to study this stuff.

[Mark-VA]

Thanks. I will try to remember to use this for searches.

Did find the posting of the TDI schematics. It is in this thread:
https://www.geotech1.com/forums/show...=TDI+PRO+PROTO

That is also why it is very hard to find specific info, info in threads not related to title.

I truly want to understand more deeply
I would love to have a wiring diagram of a White's TDI coil too.

[Altra]

Here is the patent. Fisher Impulse had a dual field also

https://patents.google.com/patent/US...+detector+coil

Dual Field
US7994789B

[Mark-VA]

Here is the patent. Fisher Impulse had a dual field also

https://patents.google.com/patent/US...+detector+coil

Dual Field
US7994789B

Thanks, that is some very good reading