FM2 on steroids

[MartyJ1963]

Hi Ricalbertvig,,,,What wire gauge did you use to build your coil? Thanks,,,,Marty

[ricalbertvig]

hello marty, use number 0.25 (30) of copper wire .. also probe 29 with the same results

[MartyJ1963]

Hi Ricalbertvig,,Thanks for the data,,,what is Probe 29? Thanks,,,Marty

[ricalbertvig]

I also tried with this diameter 0.28 (29)

[MartyJ1963]

Thanks Ricalbertvi,,I understand now,,,I have 0.25mm and 0.18mm so I will ry the 0.25mm as you have tested with. I have etched 2 more pcb's this evening but I have to wait for parts to arrive to build them. I'll let you know how it goes. Thanks again,,,Marty

[ricalbertvig]

I hope everything goes well .. you have to adjust at your point using the 2 trimer .. I made the second now the optimal setting turned out to be 130 k and 620 oh - in the previous one the adjustment was 220 k and 500 oh .. you have to play with those 2 values until you find stability and sensitivity

[MartyJ1963]

Hi Ricalbertvig,,,,Thanks for the information,,I should have parts arriving tomorrow so hopefully I can build soon. Are these the parts I should experiment with? (See photo),,,Thanks. Marty

[ricalbertvig]

I do not mean 1m pot and the 4k7 trimer next to the resistance 500 oh .. that 220k is left as it is

[MartyJ1963]

Hiya Ricalbertvig,,,,,,Thanks for letting me know,,,,When my parts arrive I will let you know how it goes. Thanks again,,,,Marty

[nonkapo]

Guys anyone having a black&white image of this board without silkscreen for heat transferring? Thanks.

[MartyJ1963]

@Nonkapo,,Regards,,Marty

[nonkapo]

God bless. Will update you once completed. Just bought second hand laminator and looking for small project to test the abilities of the method. It is around 30 years since i last etched PCB(that time by hand with lacquer or permanent marker but the technologies are moving further). Than ORCAD in the university and...change of the field followed.

[nonkapo]

Huh, when i print it it is larger size. Have to minimize and convert it to PDF;-) Will post the corrected file here.

[MartyJ1963]

@Nonkapo,,,,This is the proper size for printing,,,regards, Marty

[ricalbertvig]

hello, dom44, a query made the project felezjoo pi? .. I think it could be possible to modify the stage lf357, to detect nuggets of gold, make it more faster and stable in mineralized land like it did in fm2? .. waiting for your answer,. regards