CCPI Build

[pusateric1]

Looks to be working

[pusateric1]

I’m using a detech coil, 15x10 mono for the gp/gpx series if that matters. Ive got it wired according to the gpx coil diagram with a 5w 470ohm resistor. No coil connected in the picture above.

edit: could it be that my 3r3 resistor is only 1/2watt? I’ve read somewhere someone was using 2w. The build sheet I have specs 1/2w on it so that’s what I used

[Qiaozhi]

That could be the reason. The 3R3 resistor should be 2W, not 500mW.

[pusateric1]

Ok I replace it and see what happens.

[pusateric1]

I replaced the resistor with a 5 W because that’s what I had. No smoke. But it does get very hot. And the coil doesn’t seem to respond to any targets. Threshold stays the same
edit: this is how I’ve got the mono coil wired.

never mind. I think I got it. Just very unpredictable? I’m assuming it’s interference from the house.

[Qiaozhi]

Set your scope and probe to the x10 setting and attach the probe to the tab on the IRF480.
Does the TX pulse look correct?

[pusateric1]

I’ll check when I get home. I ended up unbridging the 5 pin connector, I connected 0v to pin 3, RX to 5 and Tx to 1 and that’s what got it to work. Before I had pins 1 and 2 connected and 3 and 4 connected. I tried both with and without the damping resistor and couldn’t tell a difference. this is the coil I’m using. It says it’s a mono loop but then I see it also says it’s a DD configuration.

https://seriousdetecting.com/product...QrkWQl_CTRSJpq

[Qiaozhi]

I don't think that coil is a double-D. It's probably a mistake in the advertisement.
You could also try making a 300uH mono test coil with some hookup wire to check that the detector is working correctly.
After that you should then be able to figure out what's what with the Detech coil.

[pusateric1]

So everything checks out on the scope. I didn’t have a dampening resistor installed so I put one on pin 2 to 4 inside the detector. 3 to 0v 1 to tx and 5 to rx. Still something isn’t right. So I pulled all the glue off the plug on the coil to look at the wiring. 1 and 5 are connected but it looks like the drain wire and pin 2,3 and 4 are connected but it’s the insulated wire.

[pusateric1]

Tried hooking pin 1and2 together, and pin 3and 4 with resistor on 2 and 4 and I get no signals. Is that’s wiring diagram for a dd style minelab coil?

[Qiaozhi]

I don't have wiring details for a MInelab DD coil.
As I said previously, it would be a good idea to make up a simple mono coil with hook-up wire to test that the detector is working correctly. After that you may be able to figure out how to connect the DD coil.

[Carl-NC]

As I said previously, it would be a good idea to make up a simple mono coil with hook-up wire to test that the detector is working correctly.

I agree, simplify the task to one problem at a time.

[pusateric1]

I was hesitant to make a coil as I wanted to use an off the shelf option. But I think you guys are correct, I’ve ordered the material to make a coil and I will report back with my findings.

[dbanner]

in ain't no genius in these matters, but i've never failed. Take a step back, then re-engage. persistance is the answer. read, research, re-educate, etc, we
are truthseekers.

[dbanner]

Carl. forgive me, MAGA