Any feedback from those who made HH or Gary's PI?

[Gary]

Re: Any feedback from those who made HH or Gary's PI?

Sorry, but it is not the same. I agree there are simularities, but this was not a copy of the his Twin loop.

[G.Gueorguiev]

Re: Any feedback from those who made HH or Gary's PI?

See UK Patent Application GB 2 153077A, published 14 Aug 1985. I've got a copy.

[Gary]

Re: Any feedback from those who made HH or Gary's PI?

As much as there are some simularities, there are also many differences. But this isn't the place to argue the points.

Additionally, I could be wrong but I believe patents run 17 years, making it redundant.

If you wish to discuss this further, e-mail me.

[Brian King]

Re: Using MPUs in Metal detectors

Hi there,
I have been interested in metal detector circuits for many years and have designed and built some real duds and some real gems in the last 25 years. I am an electronics engineer who makes a living from Agricultural electronics controllers and GPS equipment.Family and work have kept me away from doing much with MDs over the last 10 years or so and it has only been in the last 2 months or so that I have began to get some home bench time back to sink my teeth into another MD design project probably a PI.
This was the first site that popped up on the internet when doing a search for MD forums and what a great site it is.
I must say I agree with Willy when it comes to the use of Micros they are just so versatile and limitations these days are only a matter of design costs. Just 10-15 years ago in Agricultural electronics for instance,we had a motor control unit where most control was done by pretty basic anolog / digital logic combinations using discrete ICs and 4 FETs costing around $500 AUs
Today we can pack the same module with a PIC proccessor and 2 power FETs in a case the size of a cigarette package for less than $150 Aus to do the same job plus be end user programable.
I take the point that Commercial MD manufacturers protect their code, well they should as they are in business to make money.
On the hobby side of things one can still choose to use some of the great discrete MD designs I have seen on this site and elsewhere Or have a crack at building an MPU based unit and learn how to customize the code to suit your application. If you are not into writing or learning to write code then just have some fun with discrete designs they will be just as rewarding. If you are serious about MD then I guess you have to make a choice to buy an off the shelf unit or build one. Whatever one decides I would be very suprised if there is not someone out there on this forum that would not give help to sort out whatever the problem.
Anyway, enough rambling, I can't wait to start puting some of my MD ideas I have had for a few years into practice(yes will be PIC based). Will post circuits and bits and pieces as I do them ( if I am still welcome!)

Cheers
Brian K

[Ray Huffman]

Re: Using MPUs in Metal detectors

Welcome to the PI Forum Brian. New Ideas are always welcome. My problem is all my new ideas are old Ideas to most everyone else here. But they are a great bunch. Looking forward to what you have to contribute.
Ray