Thoughts on power

		Quote:			Posted by denizen
	Would you care to delve further? Would you have any advice to help solve my issue of size capacity, instead of berating me? All that sentence has done is almost illicit a negative emotional response. It is imperative I find the smallest power source that will supply 12 volts, while retaining enough amperage to last longer than 5 minutes. I understand an A27 battery has a mere fraction of amperage as compared to an AA. I am not a fool.

In your last post you reveal that you just might be fooling yourself. Perhaps you believe you are not a fool but here's the deal.

AAA batteries maximum current is 800ma. Longer that the 280ma you get from 9v batteries but not longer than the 3000ma you get from AA batteries. Like I said earlier, you may think you are reading and understanding, but clearly you are not.

Berate you? Hardly. I have done my best to "educate" you here. Among all of the people answering you, only one is known to me to be an electronics engineer by trade and training. That would be me. The rest are giving you information from what they have read on the Internet. I am giving you practical advice and you keep on ignoring it. Fool? I won't know that for sure until you come to the table with a full deck of cards ready to play the game.

Now, why don't you start over and explain why it is "imperative" that you find the smallest power source. The answer might be in the high power LiPo cells out there but we cannot possibly know based on what you have told us thus far. Stop being cagey and spill the reasons for us.

Posted on: September 25, 2011, 04:44:29 AM

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		Quote:			Posted by denizen
	What are the issues with redesigning a schematic for a larger power source? I see some detectors on the web that show multiple 9 volt batteries and some with only 4 AA. For a metal Detector could one be correct in saying that more power is better? I feel like the more power the further the detectable range. I also understand Coil size and shape have something to do with it. Also, would more power mean greater ability for discrimination, or would the power create a distortion effect much like too much volume through a small speaker?

You CANNOT simply add more power and get deeper range. End of that discussion. Any other reasons?


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The fact is that AA batteries are not that much bigger than AAA batteries but the capacity is a much greater benefit. What good is a smaller package if you only get an hour or so from the detector?

LiPo is not that expensive. They are very popular with radio control hobbyists and the sheer number of manufacturers are driving the price way down.

Posted on: September 25, 2011, 08:01:34 PM

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		Quote:			Posted by denizen
	and all this contradictory advice is no help.

The problem is that there are a lot of people here who THINK they understand a bit about electronics but very few who are experts in the field. Look towards the technical forums and ask there instead of the general forum on detectors. We have a few technical forums which are frequented by technicians and engineers who can help you a lot better and with more factual information.

I find it a real shame that the qualifications of moderators here are not listed for the benefit of the users.

Posted on: September 25, 2011, 08:04:56 PM

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		Quote:			Posted by denizen
	and i have already explained the reasons! to pack into the smallest housing so i can conserve as much space on a motorbike. this IS important.

It's nice to reduce your battery pack by 40% but hardly essential. Even 8AA batteries are smaller than a sandwich.

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		Quote:			Posted by wb4rav
	No offense but I also have two years of electronics engineering, 21 years experiance in thge feild, a ham license that dates back to 1968 when you had to take test test under the FCC,and a general radio telephone license grandfathered from the old first class license. Also work with computers and make most of my own ham equipment.  Just sayin'

None taken. I wasn't referring to you but you do help to clarify one point I made. Your credentials are not known. When someone here who doesn't even know Ohm's Law or the laws of electrical power, it becomes painfully obvious when they make statements that just won't work or might actually do damage to a device. You know what I mean.

In order to spare feelings here, I don't mention names but clearly some of the folks here should keep their greenhorn noses out of questions like the ones asked here. For those of you who know who you are, read this and pay attention. Keep your yap shut if you don't have a clue what you are discussing or I will no longer remain silent on your stupidity. I will trot you out for all to see as the "horses behind" you really are.

Sorry, wb2rav. I recognized your name here was a call sign and I was not referring to you. My HAM license goes back to the 1950s, although I have not participated since the 1970s. I have been in the field of electronic design since 1970 and continue in the present. I have a few patents and 4 of them issued to my former company are to do with metal detecting circuit improvements that are still in use today.

I really shouldn't care if anyone uses the wrong battery or tries to drive a coil too large. In fact, I don't. What I care about is wrong information being posted here, back slapping about how brilliant this guy or another one is when it is all nonsense. What happens is this becomes Gospel over time and people who don't know any better start believing wrong information. Just like in this thread. We have people here giving out bad advice and absolutely incorrect theory which, unless corrected, rattles around inside a beginner's head for the rest of his life. Not good.

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Is this for the TGSL project or something else.

There may be other options.

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Now here is an application for a flux capacitor 

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