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Offline dlcanTopic starter
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« on: January 25, 2011, 08:01:58 pm »
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Do you know of any PI detector uses aerogel capacitors to be able to drive the transmit coil at larger currents?

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Offline gambol1
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« Reply #1 on: January 25, 2011, 09:17:49 pm »
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dican, good question, I don't know much about the inner workings of detectors but I do know high capacity capacitors are used to create high current pulses for welding etc. In 1988 The largest capacitor we had available was 2.4 farad it was an electrolytic about the size of a five gallon pail. Now I understand they have 7 farad capacitors that will fit on a circuit board. Carbon foam technology is awesome. Where you need brute power, tank circuits built with high capacitance are the best. Just what advantage that would have in a detector I don't know.
........One application for carbon foam capacitors that may happen..I hope, is as a replacement for batteries. One farad will store one ampere at one volt.  If you have a large enough capacitor you have the perfect battery. Capacitors unlike batteries, lose very little of the electrical energy stored in them. What's even better. charging of capacitors is rapid and almost no energy is lost when charging capacitors relative to batteries which may convert up to 10% to heat by charging and discharging. The day of mega-farad capacitors may come. When I went to school the notion of a 1 farad was still far off.

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« Reply #2 on: January 27, 2011, 10:44:35 am »
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Thank you gambol1

I attached what I was thinking of for a design. The aerogel caps would be ideal to deliver required current to the tx coil for brief moment of time.

It is still in research phase!



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Offline GoldDigger1950
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« Reply #3 on: January 27, 2011, 12:26:37 pm »
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Quote:Posted by dlcan
Thank you gambol1

I attached what I was thinking of for a design. The aerogel caps would be ideal to deliver required current to the tx coil for brief moment of time.

It is still in research phase!

The problem with large capacitors in an RC circuit is that their discharge time is measured in hours or days rather than milliseconds. You will get no additional "kick" from a supercap. The way you have it laid out, they are used as filters, not power sources.

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« Reply #4 on: January 27, 2011, 03:52:32 pm »
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You are right in saying that this is an RC circuit. Large capacitors will have slow discharge times which will regulate the voltage and keep it stable.

The caps are in parallel with the battery and the tx side of the PI detector. Thus, they will act like a battery. We often put smaller caps in parallel with these to filter out some noise.

When the pulsing circuit turns on the transistors, what the capacitors sees is a path to ground throught the inductor in parallel with the resistor. Since the R of the inductor is smaller, the capacitors should deliver the current as per demand, throught inductor.

So in theory, an inductor with smaller R should allow for more current and a larger magnetic boost.

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« Reply #5 on: January 27, 2011, 06:14:00 pm »
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What would be the point in using them?

Diminished returns on Power when your already way up there?

Larger, Slower transistors, Fets, MosFets?

I don't see any Gain!

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Offline dlcanTopic starter
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« Reply #6 on: January 28, 2011, 09:14:56 am »
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As you can see I am new here and I am realizing that I am not welcome.

If everyone would discredit all idea put foward by members of the society, we would still be in the stone age.

I might be wrong in believing that increasing current in tx inductor will help in detecting larger items deeper than 12 inches, lack of experience, but I am convienced that the use of aerogel capacitors will have an effect. Only time will tell

Thanks anyways

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« Reply #7 on: January 28, 2011, 09:26:14 am »
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Not Welcome?Huh?Huh?

Where does that come from?

You asked a question and folks have gave there opinions and thoughts.

WOW!

If you can come up with a way to use them in any beneficial way, were all ears.

{alt}

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Offline GoldDigger1950
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« Reply #8 on: January 28, 2011, 01:57:42 pm »
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Quote:Posted by dlcan
As you can see I am new here and I am realizing that I am not welcome.

If everyone would discredit all idea put foward by members of the society, we would still be in the stone age.

I might be wrong in believing that increasing current in tx inductor will help in detecting larger items deeper than 12 inches, lack of experience, but I am convienced that the use of aerogel capacitors will have an effect. Only time will tell

Thanks anyways

Now that's a silly thing to say. You received a wealth of information absolutely free and you somehow believe we "discredited" your idea? What we did was give you the benefit of experience and now you toss it back in our faces.

Increasing the current will only raise the temperature of your coil. Increasing the voltage rather than the current will give you a greater field.

Let me personally inform you that when you have a notional idea and bring it here as a question, that is always welcome. On this forum, you will find electronics engineers with decades of experience in metal detector design and you even got an answer from one of them. Don't presume you are not welcome just because you didn't get the answer you wanted. Yes, time will teach you the lesson you seem to be incapable of learning by asking.

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« Last Edit: January 28, 2011, 02:29:37 pm by GoldDigger1950 » 		Logged
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« Reply #9 on: January 30, 2011, 07:53:20 pm »
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dican, This reminds me of a year ago and I had an idea which I presented to the board for consideration. I had been detecting for about 6 months and I thought it would be good to have a pinpointer that discriminated so I put it to the board. The response was less than what you might call receptive. Now that I have had more experience detecting I understand where they are coming from. My idea of a discriminating pinpointer would have been redundent at best but to those who have been doing this for years it must have seemed a hoot! You have just got to roll with the punches. These people are here to help not to heap criticism on new members. gambol

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