Re: magnetic quenched triggered gap

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Paul B. Brodie" <pbbrodie@xxxxxxxxxxxxx>

Hi everyone,
I'm home, finally, and Debbie says that I can spend a little bit of time at 
the keyboard, if I promise not to overdo it. My brain has suffered what the 
neurologist calls a "major insult" and I'm a little foggy. Some might say 
that this is no change. :-o Excuse me if I get a little drifty. I seem to 
have trouble staying focused.
Colin, you might as well use rare earth magnets if you want because the 
prices for them have plummeted over the last couple of years, due to so 
many of them becoming available as surplus from their use in mostly hard 
drives. The ones from hard drives have some odd shapes butt nothing that 
should prevent them being used to quench a spark gap, IMHO. Another option, 
which is extra cheap or free, is to salvage the magnets from microwave oven 
magnetrons. They aren't difficult to remove at all. They are held in an 
aluminum fixture and the joints are all pressed together or have tabs that 
are bent over. I simply pried it all apart with screw drivers and pliers. 
These magnets are usually round, about 3 inches in diameter, 1/4 inch 
thick, and have a hole in the center that is about 1 inch in diameter. 
There is a little variation in size but not much at all. They are fairly 
strong ferrite types. I have 10 of them stacked on a 3/4 inch wooden dowel 
and they are strong enough to maintain about 1/2 inch of clearance between 
each magnet when held vertically. That should give you at least some idea 
of how strong they are. If you can't get ahold of some microwaves, which 
isn't likely, let me know and I'll send these magnets to you. I don't 
really have any need for them right now and I can always get more.

Check this out. My son, Mark, went to the appliance repair shop for me 
while I was in hospital and the owner told him to go to the other shop 
because he heard that they had quite a few microwaves they were trying to 
get rid of. Mark went there and the owner told him that we had just missed 
out. A man had just taken almost 300 microwaves that he took in a huge 
truck he rented for the purpose and that it had taken 3 days and 3 
truckloads to cart them all off!!! He told Mark that he had accumulated 
them because the local junk dealers won't take microwaves for some reason. 
He said that he thought the guy was taking them somewhere up in North 
Carolina. We are in SC and the NC border is at least 150 miles away. If I 
had a place to put them, I could have been giving MOT's and such to Tesla 
Coilers for a mighty long time.
Regards.
Paul
Think Positive

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Saturday, June 04, 2005 12:22 PM
Subject: magnetic quenched triggered gap

> Original poster: "colin heath" <colin.heath4@xxxxxxxxxxxxx>
>
> hi all,
>        im looking to build a triggered gap and was wondering about the
> effectiveness of the magnetic quenched gaps?
> what sort of magnets do we need to achieve a good quech in say a 2KW system?
> can normal speaker magnets be used or are we talking about high powered
> rare earth types?
> cheers
> colin heath
>
>
>