I just received the 540. I gave my 340 with the surcharge.

​...

Excuse me, now I read that it is a half-sine wave, so I am correcting myself....

​I share the link on the archive and you get my email address. somebody evil intruder did harm me and subscribed on VIOLITY spam messages.
LOOK - this is NOT my phone number, i am NOT living in Ukraina. what going with YOU there??? you answer me by mud on my good!...

Does anyone have a photo of the deus 2 coil board?

Hi Moodz,

Given the price of the AD7760, I've been having a look for suitable alternatives for direct sampling and think the following may be quite decent - I've got one on order to play with, just need to knock up a test PCB.

https://www.akm.com/global/en/produc...-adc/ak...

Yes I have seen that article it explains basically how to solve the problem.
For modelling I used the free trial of MATLAB. But ltspice is fine for modelling the demodulating preamp.

As soon as you mentioned it, I immediately remembered this article:
https://www.analog.com/en/resources/...oaches%20zero.
A long time ago...

I have to agree 100%, I've had my Deus 2 for over 1 year now and can say, with the 9" coil it is superior to even the Equinox 800 which I had for 3 years prior to the Deus 2. You must spend time to understand what the audio is conveying to you. But it takes time. Sure, you can go to a site and...

Maybe so?

PS:I don't know physically how the individual levels of PCLK1, NCLK1... correspond to the schematic diagram, so I have simply accepted them from the description of the published source code.
Perhaps, if they refer to some of traditional schemes, the ON should be SET, the...

You have made the key point ... if you consider the transmit and recieve waveforms from a discrete sinewave ( fourier ) analysis ...every waveform in the system no matter what amplitude or period can be decomposed to an additive series of sinewaves. (note : the keyword here is additive ).
...

...

...

It looks like you are creating 10 positive pulses followed by 10 negative pulses. Half-sine recycles energy and requires alternating a single positive pulse with single negative pulse....

The solution is to put a HP filter on the input and disable the input during transients. Similar circuit solutions existed in the early days of pi metal detectors. But I don't like this solution, partly because turning the input on and off itself causes transients.
I wonder if you have found a...

My dear brother, if you want to install a VDI display circuit with the IDX Pro metal detector, then you will have to do programming in the microcontroller. If you can do it, then you can add a VDI circuit. And for double tone, you can get the circuit and information on this forum. Can you help me? What...

I'm sorry my brother kt315 the was a little miss understanding, i love Russian and Ukrainian they are providing real value to this forum and to the world and i hope your conflict gets resolved peacefully real soon, Also i remember your help with my dp2 it was priceless and a life saver. i was only talking...

Remember, I was a PRINTER's DEVIL back in 1954........What I did back then, I do with COMPUTERS today......... So when you look
at that old MAP ABOVE, remember what I just said.....I take my images to a local computer store, and have them printed there ON
LARGE SHEETS of PAPER!!!!!!!!! Not...

I got a giant map, shows each state, and in it has gold placers in it, it is inside this map. Now I got it on an PDF file, and since I bought the map,
it is enhanced and secured. Be content that you can download and see it.....But you cannot print it out now........It is toooo large to stick inside...

i am ethnical ukrainian, but my mother is russian. why you ignore all russian? this is my job, has two tones, i have 50 pcs of boards
for years ahead selling.
GMT King Cobra VLF metal detector, Tesoro Royal Sabre, bare board pcb DIY | eBay​...

Hi, Carl, can you take a look at whether this source code will work correctly for half-sine, I made it for PIC16F18426...

The requirements for this chip are:
1. Supply voltage more than 10V
2. Low input current (1pA)
3. Rail to rail output voltage

Not at all ... it also applies to mono coil PIs ....

The use of a "DC to daylight" bandwidth preamp in PIs is just plain wrong ( mono or DD etc ).

Modulation theory tells us that the lowest frequency in a PI recieve signal is the fundamental Fo of the TX ....
...

Same part, better specs.

Me again sorry i really didn't fully get it, please can anyone provide me with both the vdi and the 2 tones boards working schematics for the pcb making preferably not in russian, or refer me to exact pages in this topic as i found it pretty time consuming and confusing to scroll through more than 280...

What chip can replace TLV271IP Thank you...

That's a comparison of the parts:
https://www.utmel.com/compare/MAX467...0DBVT--7861070

Hi again hope you're doing well I'm sorry for the late response I did not get the exact part but I hope this one will be a decent substitute: TS5A3160DBVR
As that's what I have available near me. Thank you all for the great help and support. ​

Hi pechkata,
Тhose who know doubt, those who do not know are certain.

Greetings to all readers of this forum.

...

Thanks Carl-NC
Whoever can, helps....

Hello detector #1
This is taught in first grade.
You're posing like a fairground vendor....

I see what you're hinting at, you're hinting at a DD type receiving coil located like in an IB metal detector.
If this is so, then another completely non-trivial task appears here: to balance the coils in a wide frequency range.​...

Serious conversation is how the difference in Rds on and Cds between P-ch and N-ch transistors will affect the real work in practice. It is good to make this:
1. Adding of external resistors (this reduce the difference). The resistor in drain of N-ch transistor have to be with higher resistance....

Very true. You can get close enough to be usable....

Series resistance didn't prove to be an ideal solution maybe mosfet capacity!?...

No, I have only seen Youtube videos. But judging from the Tx circuit, it's probably more like a BBS detector than a PI?...

You will never be able to match the P and N drive of a half-bridge driver. To get the Rds to match, the PMOS needs to be much larger than the NMOS. Then the parasitic capacitance of the PMOS will be much larger and the damping will be different for the P & N. You can fake it somewhat by adding series...

There are smoke signals now all you need are hallucinogenic mushrooms and there you have it.

Mikron hybrid use IXTP26P20 too.Any idea how demodulator are controlled on it.

It's not so much about low RDSon, but matching. Low RDSon has benefits. The best test is the flyback voltage comparison between n and p. Coils are 300-600uH, 1R or less. The tx current depends on a many factors like PW, Tx freq, Tx voltage coil resistance etc.....

For the half-sine the TX clocks are identical to the bipolar PI:

​

For the Impulse waveform the TX clocks are this:

​...

Hi Altra,
Do you really need in this design MOS FETs with so low Rds on? What is the inductance of your TX coil and TX max current?

Hello Altra
Exactly about Johnson's patent - I want to build his Tx signals.
Not for demodulators.
Thanks for the encouragement.

Google doesn't translate correctly....

In your three photos. I think you are confusing the Tx and demodulation signals. Carl's drawing shows the demodulators sampling during the halfsine. The I sample is taken during the complete HS period and the Q sample is inverted for the first 90 deg of the HS and alternated between pulses. In the hand...

Hello Altra
How can we program a time slot?
How can we build this type - time slot?
​Is there any way to do this?


...

I don't believe the Mikron circuit is pi. One of the power mosfets is always conducting, so there is no off period to the coil. The circuit looks like an adaption of the Whites DFX or VI3 continuous square wave TX's

The second picture posted by Nasko shows which components he uses in the circuit: IRF640 + IRF9640, but let's say that the IRF740 + IRF9642 are closer in characteristics.

I think that Nasko has a solution, if he put the circuit of the Mikron hybrid transmitter, then he also knows the upper pn mosfet .... The receiver would be more interesting than the transmitter..The end result of the device working well will not be only the transmitter and not the receiver... Surely...

I totally agree. I share your opinion.

Hi algan,
The more real problem is not the using of strong MOS FET drivers. The real problem in this schematic is the find solution with symmetrical parameters of N-ch and P-ch switches if you want real good results. On the schematic of N@SKO information for the type of upper P-ch MOS FET is absent....

Hello Nasko, wouldn't it be better to use a mosfet driver from the TC4426/TC4427/TC4428 series instead of bss138 and bss84r? In this case, the signal from the chip should be low and high.

Yes ,I use Proteus

Hello NASCO
Is this your stimulator?

Mikron hibryd generator...

Hello Carl-NC
Thanks for the clarification.
What do we feed to the points?
What kind of impulse?
NCLK1
PCLK1
NCLK2
PCLK2

Do it this way:

​...

On the pcb layout this is what we can see:

1 ..... Q1 collector

2 ..... Ve-

3 ..... C4, CV1

4 ..... RV1, C2

On the bottom right image:

1 ..... Q1 collector

2 ..... Ve-

3 ..... RV1, C2

...

The half-sine is shown in Ch 26, you literally just add a series cap to the coil:

​

The Impulse TX requires shorting D1 & D2 so that flybacks are suppressed:

​​...

Sorry, I had it upside-down. The bottom-right labeling is correct, so is the bottom-left.
No idea on the resistor values. They look suspicious, but maybe they're right. I've never built this circuit and know nothing about it.

Thanks Carl for taking time to respond. So the configuration in the image at the bottom right (in the pdf) is incorrect.
One more question if you don't mind, is there something wrong with R1 27 KΩ & R2 180 KΩ? Should their position or their labels be swapped?

Hello Carl-NC
Yes, but I don't know how this happens.
I would be very happy if you could draw a schematic....

Thanks Carl. I'm just working around a problem of mounting this connector in a suitable way because none of my normal parts sources have had a connector like your picture listed which was surprising since PCB mounting is rather common. My solution will work perfectly but does take considerable machining...

how about the depth of cola can with 1 meter coil?...

Does anyone know how to increase the depth of the Pulse Star ​ in my test with a 28 cm coil, for me 1 euro is about 15 cm, which seems a little to me....

Are you wanting to create a half-sine TX, or the Fisher Impulse TX? They are done differently.

Both of your labeling schemes are wrong. From the pics you posted, they should be

Pin D ..... Pin 1 .... Q1 collector

Pin C .... Pin 2 .... Ve-

Pin B .... Pin 4 .... RV1, C2

Pin A .... Pin 3 .... C4, CV1
​
Unless I have the whole coil...

Hello Carl-NC
How can we program a time slot?
How can we build this type - time slot?
I tried but I can't do it.



...

Why ferrite zero and a not ground zero?

Hello Detectorist #1,

You may be right that it's not a real filter stage, but something very simple. I thought it might just be a matter of changing the SAT resistor value via the filter switch. Eric was a fan of simple solutions, and changing the SAT resistor value via a switch is one...

Dear Carl-NC,

This is regarding ETI 566 project. I need to make sure the transmitter coil L1 four pins connections are correct. On the transmitter pcb overlay I have marked the L1 4 Pins as 1, 2, 3, 4. On an earlier version of the article I have marked the Tx L1 4 Pins as A, B, C, D. In...

Maybe the name "Filter 1&2" of the switch is not exact. Maybe the thinks are more simple and this switch just enable or disable the control of gate of J113 by feedback in SAT stage (like in CS6PI schematic). Enabling of this control make fast SAT - disabling (grounding of the gate) -make...

Here is some additional information and pictures about the GQ SS V2 Filter 1 & 2 that I found on the Internet.

SAT Control
Set the SAT control, (Self Adjusting Threshold), to medium speed. A slight tremble on the audio note is normal and is due to residual IF pick-up on the search...

Hello, the metal detector had a problem with the IC, it was fixed. Ic lf411 or tl061.
metal detector pulse starll

Not quite sure of what you are doing, but there are GX16 connectors that mount directly on the PCB:

​...

you mean Goldquest Aquasearch, pcb ID PPD4, it is different than GQ SS....

I repaired a GoldQuest for a guy years ago and found it was the same as the CS6 PI. Eric also designed the CS6. The only exception the GQ had a battery low circuit. The one I repaired did not have the filter switch. You can see the CS6 schematic here post #15

https://www.geotech1.com/f...

You should have a closer look at the angled GX16 connector. If you would cut the connector pins right before the 90 degree angle you can solder them right onto the PCB. The rear PCB you can mount with the connector the same way like you wanted....

Here is a small vídeo of it detecting for the first time, no my plan is to improve the code and use a better ADC than the 12 bits infernal one...

Interesting...
But why not make a small circuit board, insert an original GS16 connector into the housing, and then solder the GX16 connector onto the small board? The small board has a different standard connector type that fits into the actual backplane. That would also work well and would be...

My last post showed the dimensions for making an rear mountable GX16-5 male coil connector using the pin insert from a standard GX16 connector for my AGD25 detector that uses a read panel circuit board that handles most coil damping components and the mono-dd switching. I initially modified some stock...

Normally there is a 90° phase shift between the TX coil current & voltage but coil resistance alters this a little. From you coil numbers I can see a potential difference of 0.5° but not 3°.

Also, if one coil produces 0° and another 177° it sounds like one of the RX coils is connected...

Hi KT315,
This additional information from the post of Eric is useful, but some questions rest. I guess that two stage filter is situated as the feedback from output of the SAT stage to the input of the SAT stage ( as controlled resistance (maybe J113) connected in parallel to the input resistor...

Technology Forum | Find's Treasure Forums (findmall.com)​
former PI Tech Forum of Eric

Hello GeoMax
That's exactly what I meant.
I would be happy if there was a board for this project....

Hello, in the Improved PI project, if I apply the first key as fixed Target sample 2, the key as GB sample with variable amplitude and adjust the delay times, what will happen to the op amp output? Without making an EFE sample.

Hi KT315,

thanks for posting Eric's old forum posts about the GoldQuest. I am curious, where can you find such old posts?

Hello,

I know the circuit. You can see who drew the circuit diagram at the bottom right. Also, read the notes above in the circuit diagram. This circuit diagram does NOT correspond to the blue circuit board that was previously published.​

you can raise up any Eric's posts, from a start to the finish, i do not see a problem for you. Eric wrote sometime Goldquest SS is 'experimental' one.

FIVE MICROSECONDS at the BEACH


Posted by: Eric Foster (---.proxy.aol.com)
Date: March 18, 2005 05:44PM
...

Last summer I had a friend visit me from another place, an XP Deus II owner.
Before that, my brother-in-law bought an XP Deus II and had it for a couple of months, but he didn't do well with it.
So I created a slight bias based on that.
But then that friend suggested one day that we...

The other day I received this "emergency" charger for XP Deus 1 from a friend.
Defective.
When I opened it; i noticed that two components are missing, i guess two transistors.
I can't find more detailed information anywhere on the net.
Does any of the colleagues know...

TX Voltage using for reference.
I am using this ferrite. I check the phase response of the ferrite by pumping a little bit above the coil.



28cm Coil Values;
TX:
Lp: 610uH Q: 17 Rp: 660ohm X: 38ohm
----------------------------
RX:
Lp: 6.33mH...

My SD2000 DIY build is now complete (following the forum schematic). Looking to optimize performance. And upgrade my machine
Is replacing the SSM2212 (LM394) with an AD797 the best input stage upgrade?...

It's a very good project - the forum is full of wrong projects...

...

The Deus II is a massive improvement, well worth the upgrade.

Sold! It is a very good and powerful beast. Farewell old friend.

The LM318 has a higher bandwidth and slew rate than the LF356 or LF411. LM318 = 70V/microsecond vs 12-13V/microsecond for the others.
No idea if "it will not work" because of this... I never tried.

This is the TL12000 board. Can you also post the circuit diagram for it? Many forum members would like to see this circuit diagram, which corresponds to this specific board.

This might be the answer to your needs. ​...

thank you, guys. I suspected it is the same as Goldquest Aquasearch, but not.

.... a better external sound card is something like the ARTURIA minifuse 1 & 2 .... Soundblaster is rubbish as you may have discovered.

The minifuse 1 is possibly a lot cheaper than the Soundblaster top model too.

The minifuse 2 has dual 24 bit stereo codecs. ( and alot...