Reg, is it possible.....

[Ism]

That whites altered the pinout of the coil connector?

First of all, the coil (330uh) works on Gary's PI detector as wired according to your diagram for a mono coil. I have not shielded it yet, its in the testing stage.

What I got when I connected to the TDI was threshold but no change when object passed by the coil. My coil pinout is as follows:

Pins 2 and 5 are a coil 430uh
Pins 4 and 5 are a coil 430uh
Pins 2 and 4 are jumped together
Pin 1 -N/C
Pin 3 -N/C

I thought when I examined the Whites DF coil that you were pulling down these pins to keep them from ringing (if thats the right term). I am planning to wire my mono coil to the connector as above, but before I rewire my connector I thought I would see what you had to say

Thanks,

Randy

[Roughwater]

TDI Mono coil pinout

ISM,

If you are tallking about the connector pinout for a whites TDI mono coil it is wired as follows per Reg:

Pin 1 jumpered to 5 --to shield

Pin 2, 3 & 4 are jumpered together and connect to the coax center conductor (+ side of the coil). At least thats the way I built all of mine and they work fine.

When all is properly wired you should read: 430uh between pin 1 to either pins 2, 3 or 4 and the same if reading from pin 5 to pins 2, 3 or 4. I believe the pin out is the same for the ML PI connector.

See Reg's pin out at:
http://tdi.invisionplus.net/?mforum=tdi&showtopic=376 Scroll down the page. I believe it's the same pin out as the ML PI's.

Terry

[Ism]

Nevermind....

Im not sure why on the first run it didn't work, but now it works fine. I was afraid I'd fry my TDI.

[Roughwater]

Tdi coil

ISM,

Glad it worked and you didn't fry your detector. Guess I learned something too. I didn't know the detector would work with pins 1&3 not connected.

Terry

[Reg]

Hi Terry,

It is extremely difficult to hurt the TDI, but it is a good practice to double check all connections before trying a coil. Make sure that pin 1 and/or pin 5 is not shorted or connected directly to pins 2, 3 or 4.

On the TDI, pins 4 and 5 are connected to a transmit coil. Pin 5 is the common or pin that is connected to the shield also. So, Pin 1 and pin 5 are common or shield connections. Pin 4 would be considered to be the transmit signal connection.

Now, on a mono coil, the transmit coil is also the receive coil. Keep in mind that the receive coil on a TDI is connected to pin 2 and pin 1 with pin 1 being the common for that coil. So, pin 1 would be connected to the shield of the coax also.

Now, if a person builds a DD coil, then one leg of the receive coil goes to pin 2 and the other lead goes to pin 1. Pin 1 is the common or shield of the receive circuitry and pin 2 is the signal lead of the receive circuit.

Remember, since the mono coil is both the transmit and the receive, then pins 2 and 4 have to be connected so the transmit is connected to the receive circuitry. Pin 3 is usually connected to pins 2 and 4 but probably isn't necessary.

So, in simple tersms, the following is the wiring setup of the connector;

pin 1, shield or common for the receive.

pin 2 receive signal connection.

pin 3 usually connected to pin 2 when building a mono coil.

pin 4 is the transmit signal pin.

pin 5 is the transmit common pin.

Pins 2 and 4 are normally connected together when building a mono coil. This is also the case on a dual field coil also.

Pins 1 and 5 are common pins and can be connected together also when building a mono coil.

When building a DD coil, generally no pins are connected together on the coil side. The receive coil and coax connect to pins 1 and 2 while the transmit windings and transmit coax connect to pins 4 and 5.

I hope this makes sense and I haven't made a mistake.

Reg

[Roughwater]

TDI coil connector pinout

Hi Reg,

Appreciate the explanation of the coil connector pinout. I have seen and used your pinout drawing for building my coils but having it explained makes it more clear in my mind.

Terry