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#3
03-25-2018, 10:22 AM
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Hi abdou2014
all of these schematice are the Dch85 coil stimulator I dont know these are correct or no whats the relationship beetwen the coil stimulator and main coil whats the position of coil stimulator Only esteban explain alittle about that l ask the masters geo .franco.morgan.nicolas and else please explain about the coil stimulator best regard zakari 
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#4
03-25-2018, 10:48 AM
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#6
03-26-2018, 02:45 AM
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I my observation, the coil stimulator has double purpose. First is explained by Franco above. Second, upon proper distance between the the main coil and the stimulator, it acts like an induction balance and the phenomenon will upset the balance. But in the case of the PDK distance must be observed because the PDK will overload if the stimulator is near the receiver. But i think if the receiver is not like PDK, the stimulator will serve only reference signal.
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#8
03-27-2018, 01:35 AM
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No one really knows, except the inventor of stimulator knows the exact function. However experience dictates that lrl that has stimulator make it easy to detect phenomenon than purely passive lrl. On the otherhand, old mineoro detectors uses 555 ic in astable mode as stimulator and as I see it, produces square wave output signal. I prefer sine wave.
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#9
03-27-2018, 02:14 AM
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Fire an impulse (square wave) to any inductance. What would you see at oscilloscope's screen ? Stimulus or stimulator purpose is like name said, to stimulate or boost collected 'halo-signal' and rise detection distance. But keep in mind it boost only magnetic component of induced signal, so must be arranged and placed at special place in special relationship with the manin pick-up coil. Like all in lrls must be nulled in respect of electrical field of main coil to avoid, premodulation and saturation of receiver. Like a key words from telecomm. magnetic 'preemphasis and deemphasis'. Regards Dubulumach
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#10
03-27-2018, 02:24 AM
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Hello Francoitaly
Have you ever tried LF freq. stimulus (for example stabile RC oscillator) like source injector into the TR2 mixer stage?, for example 10Hz till 100Khz ? Have you ever tried increased detection surface of silica chip by some sizeable amount? If am right? detected amplitude is in direct relationship with bulk silica size. Best regards Dubulumach
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#11
03-27-2018, 07:46 AM
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I am thinking you are right beacase if you look at dch85 The reciever is fm rang and the coil stimulator is lf wave rang Maybe reicever is receiving one of the harmonics of stimulator coil frequence Best regard Zakari
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#13
03-28-2018, 06:03 PM
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Morgan's PDK 3 has a coil stimulator, and with that it does not need to change frequency, and it can even detect fresh gold but from a few centimeters ,
I added to my PDK a stimulating coil and the sensitivity is the same, but I think with this modulation the LRL needs just a part to react ???
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