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ULTRA PI

A

Anonymous

Guest
Hi,
We are working in a new PI. A 15 cm diameter coil with 30 turns of wire detects a 2 cm diameter coin at 70 cm in first proofs.
The receiving part is based on the Proscan (uA 709).
 
Hmmmmm... 27.55 inches on a quarter sized target using a 6 inch coil.
Does it beam the target up as well?
(if you're gonna tell one, make it good!);-)
 
Just think; if you used a 15in diameter coil on this machine, you should get 36in on your test coin! Even with a 36in coil the range still hasn't peaked out at 47in!!
Do I remember correctly that you also post under the name Chester Park?
Eric.
 
Hi,
Yes, in my yahoo e-mail I use Chester Park as nickname. For this reason, considering this absence of aclaration, when I send e-mails I put my correct name in the end. In other time, my e-mail address was esteoro@altavista.com, but Altavista's e-mail service are interrupted and I decided give the same name (esteoro), but in Lycos. Sorry it if in some e-mails I did not make this explanation, but I have done it in many and in the last also.
In the recent past on this forum personally I sent information like the new technique called Pulsed Electromagnetic Induction (PEMI), remember?
Respect the ultra PI, coil diameter is 15 cm, no 15 inches. The frequency is 10-11 Hz. But the concept concerning to excite the coil is new. We and my partner are working to give the best performance, because the old 709 isn't the better. In the other hand, diode's capacitance _We think_ influences in the sensibility. You know any other arrangament to replace this protection's diodes?
We wish work on this way in order to replace the diodes. We see on a technical publication other arrangament type of protection with very very low capacitance.
Thanks for your precious time.
 
the concept of using a very long charge period makes all kinds of sense to me mathematically, cause you can build up a big coil field without getting alot of current going the wrong way in your target before you let the coil [voltage]fly. this probably means low voltage, loand low resistance, or else low efficiency. are you using a single coil for both transmit and receive functions, or do you have a two coil arrangement. Is there a consensus on which approach is best? i'm new to this and have not gotten very good results from my own efforts at a single coil design yet.
 
The arrangement to energize the coil is the key. We used a single coil. It's certain that we do not have discrimination function
 
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