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Power of the machine

A

Anonymous

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So many times I hear about this machine has a higher power output than that one. Well how about a list of the top 5-10 PI machines and their outputs in volts and amps. Thanks.
 
Hi John,
Volts and amps don't mean a lot on their own. You also have to take into acccount the number of turns on the search coil (ampere/turns); and also the diameter of the search coil has a major effect on detection range. The most powerful machine I have made pulsed 60A through the coil but would not detect a single coin at any range as it was designed to find silver bars. This illustrates the fact that the type of object you are looking for is also a factor.
Eric.
 
Hi Eric,
I know you have stated in the past that you pulsed 60amps through the coild to meet Mel Fisher's depth requirements for detecting a silver bar but have never stated what that was. Can you reveal how much depth that detector had for a silver bar?
Thanks,
Charles
 
Hi Charles,
The requirement was to find a single 70lb silver bar at 15ft range. This was because, at that time, it was assumed that the silver bars may be buried under 15ft of sand. Ironically, when they were found, they were all sitting in a big heap in what looked like a natural reef. A diver with an Aquapulse 2 thought that the detector had gone wrong as the meter and audio pegged and stayed that way as he swam over the "reef". He went back to the dive boat, checked the detector only to find all was well, but returning to the "reef", the same thing happened again. He hacked away at the sand and coral with his knife to see the grey square ends of the big pile. That must have made his day; and Mel's!
Eric.
 
Complete, please, this theme: "You also have to take into acccount the number of turns on the search coil (ampere/turns)..." because this is interest aspect.
Mrand
 
Hi,
Magnetizing force is a function of AMPERE-TURNS. (One ampere-turn is the magnetomotive force developed by 1 ampere of current flowing in a coil of one turn). If you increase the current through a coil, you increase the ampere-turns. Similarly, keeping the current the same but increasing the turns will have the same effect. By increasing the ampere-turns you increase the magnetizing force. This relates to the strength of the transmitter field as seen by an object. Increasing the current, or the turns, increases the field in proportion and hence the signal. A current of 1A in a 10 turn coil will have the same mmf as 0.5A in a 20 turn coil. Other factors, such as the coil inductance, have to be taken into account of course, when pulsing a current.
Eric.
 
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