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felezjoo PI(the best pulse induction metal detector that I made until now)
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Hello,
in the picture, you indicate the voltage of your battery.
it's not my original question.
when powering on the detector, it indicates a delay. It depends on the coil you have. This depends on the internal parameters of the cable and the care of the damping resistor.
You who have reels that disc perfectly, what do you like delay ??
Thank you.
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Originally posted by lamoiz View PostHello,
in the picture, you indicate the voltage of your battery.
it's not my original question.
when powering on the detector, it indicates a delay. It depends on the coil you have. This depends on the internal parameters of the cable and the care of the damping resistor.
You who have reels that disc perfectly, what do you like delay ??
Thank you.
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my coil is a double spider coil with a damp on the central coil (the small) the wire is 0.8mm,
the total capacitance is 100pf with the cable. it is not yet shielded (always on the work plan ..)
380mh and 0.94ohm.the delay at power up is 11 ..
thank you.
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Originally posted by lamoiz View Postmy coil is a double spider coil with a damp on the central coil (the small) the wire is 0.8mm,
the total capacitance is 100pf with the cable. it is not yet shielded (always on the work plan ..)
380mh and 0.94ohm.the delay at power up is 11 ..
thank you.
I use for example enamelled copper SWG22 which is slightly smaller, about 0.71 and high quality microphone cable.
from the values your lf357 would seem good, it is the coil and the cable that do not go well.
probably with a correct coil and a good cable you should get closer to the correct values
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""the diameter of the coil (big coil close 400uH, small coil close 350uH)" ...???????? NO.the impedance value depends;
the diameter of the wire, the number of turns, the spacing of the wires, the total diameter, the damping resistor's .... ...
my coil diameter 30cm...
thank you
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Originally posted by lamoiz View Post""the diameter of the coil (big coil close 400uH, small coil close 350uH)" ...???????? NO.the impedance value depends;
the diameter of the wire, the number of turns, the spacing of the wires, the total diameter, the damping resistor's .... ...
my coil diameter 30cm...
thank you
if your coil and cable are good then it may be the damping resistor that is not correct,
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i found this website helpful: https://www.simplemetaldetector.com/...imination-fix/
you can adjust the first numer A to get the one you need. i use ca3130 and number A is 500. i can adjust it like in the link above to 300.
Does the dumping resistor affect the numbers/functionality of the detector? i did not tried my scope on it... i use dumping resistor like in the schematic (390ohm)
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Originally posted by ionut_mtb View Posti found this website helpful: https://www.simplemetaldetector.com/...imination-fix/
you can adjust the first numer A to get the one you need. i use ca3130 and number A is 500. i can adjust it like in the link above to 300.
Does the dumping resistor affect the numbers/functionality of the detector? i did not tried my scope on it... i use dumping resistor like in the schematic (390ohm)
Thanks for the link that site has some good info
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Yes, you can use lf357h. You can also use lf157n.Better than others
For small and medium sized coils, it is best to use wires with a diameter of 0.5 or 0.6 and a maximum of 0.7. The more the diameter of the wire affects the numbers of the separation channel and the outo delay and the greater the inductance, the smaller the numbers and the longer the delay.
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