Search found 261 matches

by Bob Reite
Fri Mar 20, 2020 10:25 pm
Forum: Vacuum Technology (& FAQs)
Topic: Beware of shipping costs!!
Replies: 8
Views: 512

Re: Beware of shipping costs!!

Agreed, if it's less than 12 oz and can go first class small parcel, that is the way to do it.
by Bob Reite
Wed Mar 18, 2020 7:18 pm
Forum: Announcements and Site Administration Topics
Topic: Coronavirus pandemic
Replies: 55
Views: 2684

Re: Coronavirus pandemic

Yep, I will probably spend more time on fusor development as well. Not going to any studio locations unless it's an off the air emergency that can't be handled remotely. As far as transmitter sites, by and large they are unattended these days, so I consider them safe to visit as there is no human co...
by Bob Reite
Wed Mar 18, 2020 7:03 pm
Forum: Vacuum Technology (& FAQs)
Topic: Beware of shipping costs!!
Replies: 8
Views: 512

Re: Beware of shipping costs!!

USPS still does have "parcel post" now called "USPS Retail Ground". But I believe that you have to drag the thing down to the post office to send it, something a large company isn't going to want to bother with.
by Bob Reite
Wed Mar 18, 2020 6:55 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: HF switcher supply construction and voltage multiplication
Replies: 25
Views: 2346

Re: HF switcher supply construction and voltage multiplication

LOL! Reminds me of the very first AM solid state transmitter. No protection for the output devices. The MW-1A model got the protection diodes. I suggest that you do the same.
by Bob Reite
Fri Mar 13, 2020 6:55 pm
Forum: Images du Jour
Topic: Jim Kovalchick -My attempt at smaller fusor
Replies: 38
Views: 4449

Re: Jim Kovalchick -My attempt at smaller fusor

Yes. a bidirectional tvs does eliminate the need for two devices. I would choose a breakdown value about twice the highest voltage you expect to read under normal conditions.
by Bob Reite
Mon Mar 09, 2020 7:30 pm
Forum: Images du Jour
Topic: Jim Kovalchick -My attempt at smaller fusor
Replies: 38
Views: 4449

Re: Jim Kovalchick -My attempt at smaller fusor

The 10 ohm current sample resistor is a nasty point for transients. During an arcing event, that point tries to go to a very high reverse voltage. I lost a digital meter there. After that I installed 10 K series resistor in the ungrounded side going to the DMM, then put a 10 volt TVS diode across th...
by Bob Reite
Mon Feb 24, 2020 3:33 am
Forum: Items For Sale
Topic: Deuterium lecture bottles on ebay
Replies: 10
Views: 1686

Re: Deuterium lecture bottles on ebay

I wonder how much grief the hazmat shipping would be.
by Bob Reite
Sun Feb 23, 2020 7:11 am
Forum: Items For Sale
Topic: Deuterium lecture bottles on ebay
Replies: 10
Views: 1686

Re: Deuterium lecture bottles on ebay

I looked at the Ebay listing. In the photos, the labels do not look correct for a flammable gas! The cylinders pictured have green label which is for non-flammable compressed gases, say neon or xenon. For hydrogen or deuterium it should be a red label with a picture of a flame.
by Bob Reite
Sun Jan 26, 2020 8:46 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor Running, No Neutron Detection
Replies: 34
Views: 2123

Re: Fusor Running, No Neutron Detection

I've had no problems with having the desiccant in line between the over/under pressure vials and the mass flow controller leading to the fusor. So I would suspect an issue with the neutron counter first, if you have already checked for leaks causing air contamination of the D2 source.
by Bob Reite
Wed Jan 15, 2020 4:09 am
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: TA DA New Use of Plasmas
Replies: 10
Views: 1272

Re: TA DA New Use of Plasmas

As long as it's crystal controlled so it stays on 27.12 MHz and they keep the "garbage" from the plasma within the 326 kHZ bandwidth, the FCC won't care. Diathermy machines operate in this band.