Originally posted by SWL
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felezjoo PI(the best pulse induction metal detector that I made until now)
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Originally posted by SWL View PostVoltage varies from 0 to 3.75 at pin 15 of LCD. If apply directly 5v to pins 15 and 16 --- the backlight works. I will do a separate power supply through a resistance of 100 ohms ...
[ATTACH]48945[/ATTACH]
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Originally posted by SWL View PostOne more question ... I'm going to make a basket sensor. Size 190 mm. I’ll look for small things. Has anyone already walked with such a sensor?
[ATTACH]48972[/ATTACH]
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Happy New Year !
Ionut, can you tell for us at which PPS and pulse width you drive your flat coil?
As for compartion my clone pi-w coil-target distance limits are - 35cm for 26mm coin (1 gryvna) with flat coil 27cm, with PPS 200, pulse width 100uS.
Thanx!
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Originally posted by Vadim18 View PostHappy New Year !
Ionut, can you tell for us at which PPS and pulse width you drive your flat coil?
As for compartion my clone pi-w coil-target distance limits are - 35cm for 26mm coin (1 gryvna) with flat coil 27cm, with PPS 200, pulse width 100uS.
Thanx!
i’m not at home right now to see the exact Settings but from what i remember frequency was 201 (on felezjoo iranian forum they say it is less noise affected) and PW different from coil to coil, influenced by coil resistance. For example for my homemade flat coil r=~1.9 ohm i use less PW ~ 135 to match number A 300. For detech spiral 11” ultra sensing gpx coil R=~0.4ohm i had to push PW more ~180 to get A 300. Detech coil is more stable and deep. But did not had the time to test in the field.
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I found that 3.35 full edit no counter is not absolutely stable.
doing the tests in the air the 3.35 full edit must be below 12 of sensitivity in order not to give false signals, instead the original 3.35 demo can safely work without false signals at 18 of sensitivity.
all tested with the same setting parameters and fixed metal detector in the same position.
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Originally posted by useus View PostI found that 3.35 full edit no counter is not absolutely stable.
doing the tests in the air the 3.35 full edit must be below 12 of sensitivity in order not to give false signals, instead the original 3.35 demo can safely work without false signals at 18 of sensitivity.
all tested with the same setting parameters and fixed metal detector in the same position.
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Originally posted by ionut_mtb View Posti can run no counter version at sens 19 inside apartment without problem and good depth. Only with shielded pcb and detech coil for gpx. But these shield and coil shield/resistance/inductance is not perfect for felezjoo pi as for Mr Hamid (designer). I had read all 2600pages from iranian forum with google translate and you have alot to learn from there.
my pcb is also shielded
use spider coil 349uH 1.1ohm unshielded, flat spiral coil 350uH 1.2ohm shielded and 380uH 0.9ohm pinpointer coil unshielded all DIY
with demo 3.35 hex no stability problem 18/20 sensitivity
with no counter hex stability problems from 12 up sensitivity
in practice hex 3.35 full edit works but is not reliable, there is probably protection in the code
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i think the simplest solution is to set a variable damping resistor to your setup
then make a decision which coil ist your favourite and set it with the damping resistor to the right value
when right specs found you can add a damping resistor direct to coil and not at pcb
then try and if it works for your mod your other coils to
lorenz coils are made the same way, every coil shape has it own damping resistor at the solder connections in the coil enclosure
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[QUOTE = bernte_one; 266234] Je pense que la solution la plus simple est de r?gler une r?sistance d'amortissement variable sur votre configuration,
puis de d?cider quelle bobine est votre pr?f?r?e et de la r?gler avec la r?sistance d'amortissement ? la bonne valeur
lorsque les bonnes sp?cifications ont ?t? trouv?es, vous pouvez ajouter un r?sistance d'amortissement directe ? la bobine et non au circuit imprim?,
essayez et si cela fonctionne pour votre mod, vos autres bobines ? bobines de
Lorenz sont fabriqu?es de la m?me mani?re, chaque forme de bobine a sa propre r?sistance d'amortissement au niveau des connexions ? souder dans le bo?tier de la bobine [/ QUOTE]
thank you very much
have you pictures for more better understanding
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Originally posted by bernte_one View Posti think the simplest solution is to set a variable damping resistor to your setup
then make a decision which coil ist your favourite and set it with the damping resistor to the right value
when right specs found you can add a damping resistor direct to coil and not at pcb
then try and if it works for your mod your other coils to
lorenz coils are made the same way, every coil shape has it own damping resistor at the solder connections in the coil enclosure
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