... conventional MOSFET's is got to (be) very good. ... technology) ... expensive ... David, Re: MOSFET's being very good. I am glad that you think so because...
154
creator
creator@...
Aug 16, 2001 2:47 pm
Greetings One and All, I am an avid surfer, spending time during four or five opportunities per week riding ocean waves on one of three surfboards. Recent...
155
creator
creator@...
Aug 16, 2001 2:47 pm
Greetings, FYI, if this is of any use to anyone, I have some pics and minor info about the Radio Shack core PN # 273-104 posted on my website at: ...
156
Stan Mayer
STANMAYER@...
Aug 16, 2001 3:53 pm
... primary inductance is only 40µH for 40 turns. And the reason I have such high MOSFET and Diode losses is because the devices are switching high inductive...
157
Stan Mayer
STANMAYER@...
Aug 16, 2001 6:06 pm
... period ... Xl=Xc ... David, ERROR in Uh for pri coil ... I thought that number was pretty darned small so I repeated tests. This time I got .... The 40T...
158
David Ball
david@...
Aug 16, 2001 9:41 pm
Hi Stan, and All Thanks for reporting your primary inductance: 82mH. The reason that this is important is because of losses. Low primary inductance pushes the...
159
lgmannix@...
Aug 17, 2001 2:27 am
Hi guys, I have built a couple of megs late last year and i still tinker with them from time to time. This forum has identified many details except the one...
160
dtb1000@...
Aug 17, 2001 2:29 am
David, If the earth and MEG are dipoles, then placing th MEG in a Faraday cage should prove or disprove that theory. DTB ... inductance pushes the operating...
161
David Ball
david@...
Aug 17, 2001 4:24 am
DTB, I found an aluminium brief case, put the MEG into the case + batteries. Only the 'Hot' output lead comes out, this is connected to a 28K 10W load to the...
162
David Ball
david@...
Aug 17, 2001 4:25 am
DTB, OK will put the MEG into an enclosed TIN, bring the 'Hot' output through a small insulated hole and retest the load to earth. Will post result tomorrow....
163
Stan Mayer
STANMAYER@...
Aug 17, 2001 4:29 am
... was analog gain devices, and ... 2Amps, ... drive ... David & DTB, I agree that a switch is what we need and I couldn't find any switches at this site. Ah...
164
Stan Mayer
STANMAYER@...
Aug 17, 2001 4:47 am
... technology) ... expensive ... David and all, Regarding pricing and availability ... I called the rep and learned that prices for these fine MOSFETs are...
165
Stan Mayer
STANMAYER@...
Aug 17, 2001 5:15 am
... with ... be ... Lindsay, Speaking for me and my two megs, so far the effect of the magnet is nebulous and I haven't been able to measure anything re: this...
166
Stan Mayer
STANMAYER@...
Aug 17, 2001 6:24 am
... ...heavily snipped and my replies inserted in body of message marked with *'s ... ... improve much more. There is a loss I can not identify, I thought it ...
167
dtb1000@...
Aug 18, 2001 12:04 am
Stan and David, There are a number of companies such as, Polyfet.com/ VDMOS voltage to 50V DC to 1.5Ghz 4W to 300W Solitron Devices.com/ N and P channel -60...
168
David Ball
david@...
Aug 18, 2001 4:40 pm
Hi Stan and All, Somewhere Stan you asked for formula for transformer & inductor design. Here are some that will be useful: Np = Vin / 2fr*CSA*Bt where...
169
Matt White
mattwhite@...
Aug 19, 2001 3:48 am
I am interested in knowing how much a nanocrystalline core will be. If it is "reasonable" then I would like to get one. However, I would like to know if it...
170
Michael Couch
cmichael_couch@...
Aug 19, 2001 4:37 pm
Stan, Sorry, I haven't gotten the spherical magnets to you yet but funds are abizmal right now. Remember, that I am a theorist not an experimentor per se....
171
Stan Mayer
STANMAYER@...
Aug 19, 2001 5:42 pm
... (Replies within message) ... are ... I know how it feels. ... Yes I know. There are lots of you theorists out there. :-) ... more ... I am not sure. You...
172
David Ball
david@...
Aug 20, 2001 9:42 pm
Hi All, I'm surprised that know one was commented about this unusual flow of current from Stan and my MEG secondaries. If you missed the particular thread this...
173
David Ball
david@...
Aug 21, 2001 3:04 am
Hi Stan and All, At elevated frequencies there is appreciable losses in large windings (like the MEG's secondary) These losses are due to 'Skin effect' . This...
174
Michael Couch
cmichael_couch@...
Aug 21, 2001 3:28 am
David, Let me get this straight. What you are saying is that you only need one wire from the output coil to be connected, the "Finish" lead? Is that the one...
175
David Ball
david@...
Aug 21, 2001 3:54 am
Michael, Yes only one wire!!!! So where are the electrons flowing from, if indeed they are flowing? And Yes the "Finish Lead" is the one furthest from the...
176
dtb1000@...
Aug 21, 2001 2:15 pm
David, A conductor's resistance is not the same for alternating current as it is for direct current. With alternating current other effects force the current...
177
Andrew King
andrew.king@...
Aug 21, 2001 2:15 pm
Hi, A most interesting effect. Looks like an electrostatic effect. What did you see on the scope when the probe was arcing? An arc of 1 cm represents about...
178
Michael Couch
cmichael_couch@...
Aug 21, 2001 3:30 pm
David, What kind of power does that 250V 175Khz 10mm arc represent then? Sure seems like it would be more than 12v would produce. What is the amperage on the...
179
David Ball
david@...
Aug 22, 2001 4:05 pm
DTB, Yes I agree. AC resistance should be determined. This loss must be considerable, since the secondary on many MEG's have large number of turns, and operate...
180
David Ball
david@...
Aug 22, 2001 4:05 pm
Hi Andy and Michael, I will answer both your emails here since, my number of posts is getting a little embarrassing. Snip from A.King's post: A most...
181
Stan Mayer
StanMayer@...
Aug 22, 2001 7:03 pm
... <snipped> ... batteries. Only the 'Hot' output lead comes out, this is connected to a 28K 10W load to the oscilloscope ground. I still get sinewave output...
182
Stan Mayer
StanMayer@...
Aug 22, 2001 7:09 pm
... DTB, I thought I replied to this message but it looks like I may not have. Anyway, just wanted to thank you for the hints. Keep them coming!!!...
