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Good evening Mr. Carl, on this metal Idx Pro I have always used an original blue max 950, and I have never tried to replace it with another coil, but I will try immediately. Thanks for his contributions, always welcome.
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The 950 is a concentric and they tend to be very immune to thermal shifts. But try another coil just to make sure.Comment
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Who have this pcb layout can you shareComment
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I have not seen this PCB before. It looks to be 2-layers. If this is true, try searching with the keywords "2 layers" "2024". Perhaps PCBs manufacturers websites have it.Originally posted by paku View PostComment
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Is there a parts list?VDI,LCD
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Yes, the board is 2-layer, but it has one minus, it won't work very well in IDX and that's because the 33nf capacitor in RX has no place for it, it has to be in the coil, my justification for tuning the coil is that one capacitor is not enough to obtain the desired frequency, this is just my opinionComment
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I made this pcb and it working fine. Mazixx is funny what you sayingComment
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If you don't like 33nf to be on the board just placed in searching coil, simple. That's doesn't mean that pcb will not work properly. You can see in my YouTube channel how it's workComment
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Resonance frequency 6590 Hz maxOriginally posted by bonchev2 View Post
Capacitance 1uF min, 1.2 uF max (3 caps in parallel)
Inductance 540 uH nominal
Resistance 1.6 ohm max
RX tank circuit
Resonance freq. 4900 Hz max
Capacitance 30 nF min, 36 uF max (3 caps in parallel)
Inductance 36 mH nominal
Resistance 70 ohm min, 120 ohm max
I'm not writing that the board won't work, what I mean is that with one capacitor it will be difficult to obtain a given RX frequency of the coil, and by the way, you don't show anything new on your website except the board, connect the coil and show what the frequency is and what this cosmetic gives, In my opinion, it brings nothing new.
there is no need to be offended, just tell me that in order for it to work well, some elements need to be replaced with newer models, and so replace lf347, NE 5534, BC547.BC327,Comment
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Hii Mazixx. Thanks for your reply and yes you are right is not something new and I didn't say there was. For the coils is almost the same, RX is with little lower freq.So far all the parts are found but maybe LF347 is harder to find and can by replaced with TL074 or TL084 I try it LM324 but I don't like the result. Greethings, and Happy Holydays to everyoneComment
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Kind regards to everyone,
I am starting to assemble the IDX-PRO detector; however, several questions arise that I hope someone kind enough to overlook my ignorance can answer. I have seen several schematic diagrams, but how is the signal for powering the Tx coil generated? It is supposed that the Tx coil should be powered with a sinusoidal signal; however, within the schematic diagram, I don't see any type of generator already implicit in the design. Thank you very much to anyone who reads this and, of course, to anyone who has the patience to provide me with an answer.Comment
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Q1 & Q2 form a feedback oscillator circuit. The TX coil and I presume an internal capacitor set the oscillation frequency.
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Originally posted by orrtizz1 View Post
I highly recommend not to install R9 regardless of what the schematic or BOM say, which is either 39 ohms or 100 ohms. Instead, install a 200 ohms trimmer and adjust it while you balance your coil. You can preset it at the mentioned resistance in the schematic and start adjusting it from there. You'll notice a difference in detection range. you can always replace the VR with a fixed one after you find the sweet spot between the R9 value and a balanced coil. Keep in mind every time you change the value of R9, your coil will go off balance. So, it's really a matter of adjusting and testing with a scope help of course.
Good luck!Comment
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hi my idx pro i using coil for excalibur2
https://youtube.com/shorts/DQPFdwmog...d6GIW841DNSqlTComment
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