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Hello detector enthusiasts all over the world, since xr71, it seems that there is no good pi detector circuit out for everyone to diy, so I want to call on everyone to work together to improve the performance of the detector. After many years of diy, I I found that the preamplifier played a decisive role in the stability of the entire instrument. I have considered differential amplification, but I have not yet experimented. Now I ask you a few questions. 1. Regarding the preamplification, what method is used? What chip can make the machine stable, high sensitivity, low noise, 2. Regarding the interference of soil, what circuit can be used to minimize the noise, so that the machine will not rattle with the movement of the coil, or the machine will lose too much sensitivity 3. Regarding the reset clear circuit, what method is used to solve it is simple and effective. I look forward to speaking with friends from all over the world. If you are very interested in making detectors, you can also contact me by email. My mailbox is [email protected], thank you all
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I found that the preamplifier played a decisive role in the stability of the entire instrument
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LDG
chinese manufacturers must do original LF357, not fake they do now. then we will get good reasult.
this is one and primary MAIN cause of all troubles. i can give you million customers' reviews screaming that the chips are fake.
in this state of China manufacturing actuality novaday that is lowest and unhonest we are not able to get the stabile parameters of the deepers.
also China manufacturer must put more copper on boards and raise a quality of adhezion of the copper layer to a base.
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kt315 You are right. It seems that lf357 is hard to buy. Of course, in addition to the chip, the circuit design is also critical. Can we add some control circuits, such as the problem of temperature drift?Comment
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this schematic was projected to protect from any kind of drift, so why it is so complicated. nothing critical.
your problem is in my opinion you do not wish to devote attention to right shielding of housing
in full measure. i told much times that if shielding is absent people get just headache. this price for the carelessness.
you must remember always - original DP is working and working perfect. if your DP is not working good
thats only your problem. also, you use poor acubattery. made in China, eah?Comment
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I can't understand how dp prevents drift, it has no circuit design to prevent driftComment
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first stage is UNICAL. this is way to kill drift of opamp in EVERY time period. open surf open bara open MPP. you DO NOT SEE THIS WAY NOWHERE!!!
DP IS UNICAL ADVANCED SCHEMATIC. i tell you about one way you must see other.
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Thank you, kt315, what is the role of the line from t2 to 4538?Comment
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please do not do me brilliant member with 100000 posts. you have to learn yourself because
i am not professor of Preston university technology cathedra. my job is street wiper.
open the link and read https://www.google.com/search?q=basi...h=842&biw=1280
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When metal is near the sensor, overload occurs and the signal disappears. The node on transistors T2 and T3 generates pulses varying in length, which move all the strobes away. When there is no overload, these transistors do not participateComment
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thank you SWLComment
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Can anyone provide a solution to the impossibility of using pulse detectors under high-voltage lines? How to eliminate the interference of high voltage wires, thank youComment
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Very difficult try setting your pps to 1200, that number is a multiple of 50 and 60 HzComment
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I worked for 3 consecutive months to avoid noise.
I tried many methods including shielding. I could not solve the noise affecting ADC.
I think the problem is that it gets the surrounding noise at the moment of emptiness and it's own self noise.Comment
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this matter dissolved in 1000s threads. forum does not have possibility to combine the threads in one.
i did esspecial ONE/GENERAL thread related to EMFI https://www.geotech1.com/forums/show...d-InterferenceComment
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Which friend likes fishing? Can anyone provide me with a circuit to lure fish, or some theoretical knowledge that can lure fish, except foodComment
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