Magnum on steroids!

[Wiltran]

Thanks Timekiller! yes that has to be right because I looked up the schematic for Gold mask 5 and it shows that it connects to the frequency switch center connector. I am going to try that today because the way I have now it seems like a dead short... no reading on the frequency counter.

[timekiller]

On collector Q7 .

[Wiltran]

GM4 coil

My Magnum also works great.
The THT board is checked and working properly.However, the author of the topic made a mistake with connecting the coil.
When I started the detector according to recommendations from the forum the detector worked very bad.
The third coil that is responsible for BG and DISC should be a separate winding not continuing TX!
Correct coil connections are shown in diagram GM5



[ATTACH]39849[/ATTACH]

Can anyone tell me what pin 5 on the coil connects to? I am building a GM4 coil with the extra TX winding.

[timekiller]

No, this diode SS14 has a protective function . Should be at the beginning of the 12 volt line , at the top left corner is not diode . 100 mkh inductance or 10R resistor .

[Wiltran]

Timekiller, thanks for your help. One more question, is the SS14 diode the unmarked diode at the top left corner of the through hole board design?

[timekiller]

No . highly recommended for stable operation 12v .

[Wiltran]

this is the PCB last revision I can find

Does this circuit have a voltage doubler that allows it to run on a 5V battery?

[timekiller]

this is the PCB last revision I can find

[Wiltran]

OK , I marked some things. D11 SS14 and R101 2.7k missing , R101 think it's necessary

Yes thats the version I built, missing 2.7k from pin 5 of 1458, C48 and C49- are they necessary? What is the applied voltage at + and -
12V?

[timekiller]

OK , I marked some things. D11 SS14 and R101 2.7k missing , R101 think it's necessary

[Wiltran]

What are the power requirements and battery hookup connections. I built Ivconics through hole design. It seems to be missing connections.

[Nandor]

Hi

It is the capacitive effect of your hands! Make a proper electrical shielding or grounding connection for cable and for the pcb plastic housing, search forum for detailes!

good luck

[timekiller]

Greetings to all . I made this detector, but I have a small question .The board is SMD, not redu - full variant 2 4053 . Discrimination is normal, distance is about 30-32 cm 1 euro coin .The coill is 26 cm with suitable inductance.

But there is something like a skin effect , when touches the cable or housing MD this gives false signals . Not yet tested in the field.

Is this normal in the building ?

[getsa]

Hi all,
Such a problem arose - the comparator threshold does not change when the R35 trimmer is rotated along its entire end-to-end range.
All voltages are normal, all parts are brand new (nevertheless they are re-measured before installation).
In general detector works but not so deeply (10-15 centimeterс fор medium size coin). For non-ferrous discrimination works ok, but but the iron
is discriminated across the entire adjustment range of the potentiometer "DISK". It seems that both problems are interrelated?
Thank`s in advance for any ideas анд tips for dealing with the problem.

[vlambers]

I will not argue, just lay out for those who wish - the board is fully working, collected by all and all ....
link to google drive https://drive.google.com/drive/folde...lNsa3dMVU9BLU0
and link to psbway https://www.pcbway.com/project/share..._Detector.html


Please who should take it)