LOOKING FOR GOLDSCAN 4 Schematic.

[David222]

Why don't you make the GS-5?
In my opinion it is a better detector than the GS-4.
In the past I made a LITE version of GS-5 and it worked very well.
My LITE version has the identical time base as TDI SL.
The VCO is very nice, because it has a CD4046.

https://youtube.com/shorts/2tXTbySBUD4

Thank you.Do we need to enable the mirror option for Gerber output for pcb printing?I am confuced.You said you used a 33 cm coil,What was the wire number,inductance and resistance?I want to make it myself.Tanks

[Op04]

Updated but still need to check further, this is my attemp for Eduardo's GS5 Lite

[nejdet]

Updated but still need to check further, this is my attemp for Eduardo's GS5 Lite

I can't open the archives.

[Op04]

I can't open the archives.

Extract using winrar, its a zip file inside

[nejdet]

Ok

[Emersonpaz]

Hello Geo Max and hello everyone. Well...you were right, it didn't work. I'm going to start all over again.
What is the assembly order for the module steps? I'll try to learn.

It didn't work??? No sign of life??? Do you have clear photos of the entire board???

[tifred]

Hello, no, nothing, no sound, and just smoke! I've decided to desolder the PCB and start all over again! I'll need new components. This time, I'd like to learn the assembly and testing steps. It's difficult when you don't have a real background in electronics. A simple assembly is easy; I've built two Barracudas, two Surf Pi, and the KT315 Delta Pulse, all of which worked perfectly. But with the GS5, it's a failure... I'm going to try starting over with a new PCB...

[David222]

It didn't work??? No sign of life??? Do you have clear photos of the entire board???

hi.how are you?i built the GS5 and with a 28cm coil,2 ohms and 400 uH inductance, it detects a 28mm coin in air 30cm. can you tell me what your circuit looks like? please tell me the specifications of your coil and if there is any special setting i can do with the osilloscope. sorry for the bad language .tanks.of course i don't know the test points for the osilloscope.

[pito]

.. I'm going to try starting over with a new PCB...

show schematic

[tifred]

the shemas is page 37 !

[eduardo1979]

the shemas is page 37 !

Please post in English.

[tuntunlin]

[tuntunlin]

Dear Eduradro,
I hope you are doing well. Please take your time to reply whenever you are free.

I am currently building a GS5 Lite metal detector. I have already set the 4 simple timing components accurately. For the coil, I am using a self-wound 8-inch coil with 24 AWG wire, wound 27 times, and I have tested it. I also adjusted the waveform at the output of the NE5532 to be correct.

However, when I test it with a metal target, it only responds at a very short distance.

What I would like to know is:

1. What is the correct specification/ratio for the coil (wire gauge, diameter, number of turns)?
2. What is the correct frequency (in kHz) that should be set on the NE555 timer?
3. At the output of the NE5534, what should the DC voltage and AC voltage be approximately?

If there are any other more precise details or adjustments I should consider, I would also greatly appreciate knowing them.

Thank you very much for your guidance.

[tuntunlin]

Why don't you make the GS-5?
In my opinion it is a better detector than the GS-4.
In the past I made a LITE version of GS-5 and it worked very well.
My LITE version has the identical time base as TDI SL.
The VCO is very nice, because it has a CD4046.

https://youtube.com/shorts/2tXTbySBUD4

Dear Eduradro,

I hope you are doing well. Please take your time to reply whenever you are free.

I am currently building a GS5 Lite metal detector. I have already set the 4 simple timing components accurately. For the coil, I am using a self-wound 8-inch coil with 24 AWG wire, wound 27 times, and I have tested it. I also adjusted the waveform at the output of the NE5532 to be correct.

However, when I test it with a metal target, it only responds at a very short distance.

What I would like to know is:

1. What is the correct specification/ratio for the coil (wire gauge, diameter, number of turns)?
2. What is the correct frequency (in kHz) that should be set on the NE555 timer?
3. At the output of the NE5534, what should the DC voltage and AC voltage be approximately?

If there are any other more precise details or adjustments I should consider, I would also greatly appreciate knowing them.

Thank you very much for your guidance.

[eduardo1979]

Hello. I used an original Minelab 8" Mono coil, which had an inductance of 300uH and a resistance of approximately 0.4 Ohms. The value of the damping resistor is very important, and I believe it was 680 Ohms, if I remember correctly. You can solve this by using a potentiometer and a couple of coupled resistors. Connect this assembly where the damping resistor is located, and with the help of an oscilloscope, find the corresponding value. With the coil connected and far away from any metallic object, the output of the 5534 should read as close to 0 Volts as possible. The frequency is variable, as there is a potentiometer to adjust it. Around 2.8kHz is fine. You should carefully measure the +5V supply, as it comes from the charge pump, which is synchronized with the detector's frequency, and this voltage should not vary with changes in frequency. That's why the frequency potentiometer should be 1K, no more, to avoid unpleasant surprises.