M
Michael Robinson
Guest
test
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Michael Robinson
Guest
"Michael Robinson" <kellrobinson@yahoo.com> wrote in message
news:gqj4ea$il7$1@aioe.org...
news:gqj4ea$il7$1@aioe.org...
test replytest
J
JeffM
Guest
Michael Robinson wrote:
Do your testing in a group with TEST in its name, moron."Michael Robinson" <kellrobinson@yahoo.com> wrote in message
news:gqj4ea$il7$1@aioe.org...
test
test reply
E
Eeyore
Guest
JeffM wrote:
Graham
That's a bit hard. Does it offend you excessively ?Michael Robinson wrote:
"Michael Robinson" <kellrobinson@yahoo.com> wrote
test
test reply
Do your testing in a group with TEST in its name, moron.
Graham
J
John Fields
Guest
On Fri, 27 Mar 2009 15:35:50 -0700 (PDT), JeffM <jeffm_@email.com>
wrote:
What if he wants to make sure that his post gets through to a group with
sci.electronics.basics in its name?
What's wrong with that?
JF
wrote:
---Michael Robinson wrote:
"Michael Robinson" <kellrobinson@yahoo.com> wrote in message
news:gqj4ea$il7$1@aioe.org...
test
test reply
Do your testing in a group with TEST in its name, moron.
What if he wants to make sure that his post gets through to a group with
sci.electronics.basics in its name?
What's wrong with that?
JF
M
Michael Black
Guest
On Sat, 28 Mar 2009, John Fields wrote:
whatever he actually has to say, be it a question or a reply. He
can judge by the responses whether or not his post appears, or if
he still has doubts, he can go to google and check the archive there.
No, testing in non-test newsgroups is the mark of the clueless. They
all claim they need to test a specific newsgroup, but really give
it no thought.
Michael
testing in one of the many test newsgroups, and then posts here withOn Fri, 27 Mar 2009 15:35:50 -0700 (PDT), JeffM <jeffm_@email.com
wrote:
Michael Robinson wrote:
"Michael Robinson" <kellrobinson@yahoo.com> wrote in message
news:gqj4ea$il7$1@aioe.org...
test
test reply
Do your testing in a group with TEST in its name, moron.
---
What if he wants to make sure that his post gets through to a group with
sci.electronics.basics in its name?
What's wrong with that?
Either he has a reason to post here, or he doesn't. He does his
whatever he actually has to say, be it a question or a reply. He
can judge by the responses whether or not his post appears, or if
he still has doubts, he can go to google and check the archive there.
No, testing in non-test newsgroups is the mark of the clueless. They
all claim they need to test a specific newsgroup, but really give
it no thought.
Michael
M
Michael Robinson
Guest
"John Fields" <jfields@austininstruments.com> wrote in message
news:45tqs4t7d2omk2ho213a0gp4ilhhh2esk7@4ax.com...
news:45tqs4t7d2omk2ho213a0gp4ilhhh2esk7@4ax.com...
My last post at s.e.d. failed.On Fri, 27 Mar 2009 15:35:50 -0700 (PDT), JeffM <jeffm_@email.com
wrote:
Michael Robinson wrote:
"Michael Robinson" <kellrobinson@yahoo.com> wrote in message
news:gqj4ea$il7$1@aioe.org...
test
test reply
Do your testing in a group with TEST in its name, moron.
---
What if he wants to make sure that his post gets through to a group with
sci.electronics.basics in its name?
What's wrong with that?
JF
J
John Fields
Guest
On Sat, 28 Mar 2009 11:10:01 -0400, Michael Black <et472@ncf.ca> wrote:
So you advocate a multi-step process to achieve what can be done by
sending a one-word post to a target newsgroup?
That's kind of bizarre, as is the part about going to Google Groups to
see whether the post actually made it onto USENET and then was picked up
by Google and added to their archive, when the purpose of the post was
to see whether the post made it onto USENET, not whether it was picked
up by Google.
---
I strongly disagree, and submit that being clueless is what would cause
people to jump through your hoops instead of sending a simple, one word
post to the target newsgroup.
---
You're not a mind reader, so that's merely an assumption.
If one wants to test to see whether one can post to a specific
newsgroup, I can't think of a more efficient way to do it than to send a
message to that newsgroup and then use a newsreader to see whether it
got there or not, can you?
JF
---On Sat, 28 Mar 2009, John Fields wrote:
On Fri, 27 Mar 2009 15:35:50 -0700 (PDT), JeffM <jeffm_@email.com
wrote:
Michael Robinson wrote:
"Michael Robinson" <kellrobinson@yahoo.com> wrote in message
news:gqj4ea$il7$1@aioe.org...
test
test reply
Do your testing in a group with TEST in its name, moron.
---
What if he wants to make sure that his post gets through to a group with
sci.electronics.basics in its name?
What's wrong with that?
Either he has a reason to post here, or he doesn't. He does his
testing in one of the many test newsgroups, and then posts here with
whatever he actually has to say, be it a question or a reply. He
can judge by the responses whether or not his post appears, or if
he still has doubts, he can go to google and check the archive there.
So you advocate a multi-step process to achieve what can be done by
sending a one-word post to a target newsgroup?
That's kind of bizarre, as is the part about going to Google Groups to
see whether the post actually made it onto USENET and then was picked up
by Google and added to their archive, when the purpose of the post was
to see whether the post made it onto USENET, not whether it was picked
up by Google.
---
---No, testing in non-test newsgroups is the mark of the clueless.
I strongly disagree, and submit that being clueless is what would cause
people to jump through your hoops instead of sending a simple, one word
post to the target newsgroup.
---
---They all claim they need to test a specific newsgroup, but really give
it no thought.
You're not a mind reader, so that's merely an assumption.
If one wants to test to see whether one can post to a specific
newsgroup, I can't think of a more efficient way to do it than to send a
message to that newsgroup and then use a newsreader to see whether it
got there or not, can you?
JF
J
JeffM
Guest
John Fields wrote:
if EVERYONE used that technique.
Test posts flooding discussion groups.
Forsale crap flooding discussion groups.
Every idiot in the world doing drive-by spam for his website.
Morons posting to groups they have never even bothered to read.
There is a REASON why norms have been established.
If one wants to test to see whether one can post to a specific
newsgroup, I can't think of a more efficient way
Efficient for the sender; NOT efficient for EVERYONE ELSE.
stop and think what a DISCUSSION group would look liketo do it than to send a message to that newsgroup
and then use a newsreader to see whether it
got there or not, can you?
Before advocating/defending a technique,
if EVERYONE used that technique.
Test posts flooding discussion groups.
Forsale crap flooding discussion groups.
Every idiot in the world doing drive-by spam for his website.
Morons posting to groups they have never even bothered to read.
There is a REASON why norms have been established.
M
Michael Robinson
Guest
"JeffM" <jeffm_@email.com> wrote in message
news:03a8b344-59f8-4cfc-8f29-3fb947c9d124@d2g2000pra.googlegroups.com...
news:03a8b344-59f8-4cfc-8f29-3fb947c9d124@d2g2000pra.googlegroups.com...
Simmer down. It's not the end of the world.John Fields wrote:
If one wants to test to see whether one can post to a specific
newsgroup, I can't think of a more efficient way
Efficient for the sender; NOT efficient for EVERYONE ELSE.
to do it than to send a message to that newsgroup
and then use a newsreader to see whether it
got there or not, can you?
Before advocating/defending a technique,
stop and think what a DISCUSSION group would look like
if EVERYONE used that technique.
Test posts flooding discussion groups.
Forsale crap flooding discussion groups.
Every idiot in the world doing drive-by spam for his website.
Morons posting to groups they have never even bothered to read.
There is a REASON why norms have been established.
F
Fred
Guest
In message <gqmcro$ovs$2@aioe.org>, "Michael Robinson"
<kellrobinson@yahoo.com> wrote:
*PLONK!*
<kellrobinson@yahoo.com> wrote:
Wow, what a jerk."JeffM" <jeffm_@email.com> wrote in message
news:03a8b344-59f8-4cfc-8f29-3fb947c9d124@d2g2000pra.googlegroups.com...
John Fields wrote:
If one wants to test to see whether one can post to a specific
newsgroup, I can't think of a more efficient way
Efficient for the sender; NOT efficient for EVERYONE ELSE.
to do it than to send a message to that newsgroup
and then use a newsreader to see whether it
got there or not, can you?
Before advocating/defending a technique,
stop and think what a DISCUSSION group would look like
if EVERYONE used that technique.
Test posts flooding discussion groups.
Forsale crap flooding discussion groups.
Every idiot in the world doing drive-by spam for his website.
Morons posting to groups they have never even bothered to read.
There is a REASON why norms have been established.
Simmer down. It's not the end of the world.
*PLONK!*
J
John Fields
Guest
On Sat, 28 Mar 2009 13:28:35 -0700 (PDT), JeffM <jeffm_@email.com>
wrote:
Nonsense.
If one objects to test posts, all one has to do is ignore them or,
better yet, filter on 'test' in the subject line.
---
Pretty much like what they look like now, but fuck you, Jeff.
Who in the hell do you think you are, telling me how I should live my
life?
---
You left out netkops adding to the melee with their never-ending,
bandwidth-wasting, ineffective bitching.
---
And reasons why they change.
JF
wrote:
---John Fields wrote:
If one wants to test to see whether one can post to a specific
newsgroup, I can't think of a more efficient way
Efficient for the sender; NOT efficient for EVERYONE ELSE.
Nonsense.
If one objects to test posts, all one has to do is ignore them or,
better yet, filter on 'test' in the subject line.
---
---to do it than to send a message to that newsgroup
and then use a newsreader to see whether it
got there or not, can you?
Before advocating/defending a technique,
stop and think what a DISCUSSION group would look like
if EVERYONE used that technique.
Pretty much like what they look like now, but fuck you, Jeff.
Who in the hell do you think you are, telling me how I should live my
life?
---
---Test posts flooding discussion groups.
Forsale crap flooding discussion groups.
Every idiot in the world doing drive-by spam for his website.
Morons posting to groups they have never even bothered to read.
You left out netkops adding to the melee with their never-ending,
bandwidth-wasting, ineffective bitching.
---
---There is a REASON why norms have been established.
And reasons why they change.
JF
Guest
On Mar 28, 9:38 am, "Michael Robinson" <kellrobin...@yahoo.com> wrote:
Well what was the post about? Come on, the anticipation is killing
us.
Michael Darrett
"John Fields" <jfie...@austininstruments.com> wrote in message
news:45tqs4t7d2omk2ho213a0gp4ilhhh2esk7@4ax.com...
On Fri, 27 Mar 2009 15:35:50 -0700 (PDT), JeffM <jef...@email.com
wrote:
Michael Robinson wrote:
"Michael Robinson" <kellrobin...@yahoo.com> wrote in message
news:gqj4ea$il7$1@aioe.org...
test
test reply
Do your testing in a group with TEST in its name, moron.
---
What if he wants to make sure that his post gets through to a group with
sci.electronics.basics in its name?
What's wrong with that?
JF
My last post at s.e.d. failed.
Well what was the post about? Come on, the anticipation is killing
us.
Michael Darrett
M
Michael Robinson
Guest
<mrdarrett@gmail.com> wrote in message
news:6c44e344-a74b-4cbc-a930-140ce218f1d5@b7g2000pre.googlegroups.com...
On Mar 28, 9:38 am, "Michael Robinson" <kellrobin...@yahoo.com> wrote:
Well what was the post about? Come on, the anticipation is killing
us.
Michael Darrett
Well, I finally got the posting problem licked. At least I hope so.
I won't tell you about my attempted post at s.e.d., but if you want
something to ponder, consider a LCLR induction heater with a center-tapped
work coil, current fed through a choke, with push-pull drive using mosfets
to ground at either end of the coil.
Now, according to theory, you should optimize power transfer by driving the
tank 90 degrees out of phase with tank voltage.
But on the self-resonating induction heater I built, the drive is in phase
with the tank voltage; that is, it switches when the tank cap has zero
voltage. No problems, works great.
I just found that kind of interesting, and thought you might too.
news:6c44e344-a74b-4cbc-a930-140ce218f1d5@b7g2000pre.googlegroups.com...
On Mar 28, 9:38 am, "Michael Robinson" <kellrobin...@yahoo.com> wrote:
"John Fields" <jfie...@austininstruments.com> wrote in message
news:45tqs4t7d2omk2ho213a0gp4ilhhh2esk7@4ax.com...
On Fri, 27 Mar 2009 15:35:50 -0700 (PDT), JeffM <jef...@email.com
wrote:
Michael Robinson wrote:
"Michael Robinson" <kellrobin...@yahoo.com> wrote in message
news:gqj4ea$il7$1@aioe.org...
test
test reply
Do your testing in a group with TEST in its name, moron.
---
What if he wants to make sure that his post gets through to a group with
sci.electronics.basics in its name?
What's wrong with that?
JF
My last post at s.e.d. failed.
Well what was the post about? Come on, the anticipation is killing
us.
Michael Darrett
Well, I finally got the posting problem licked. At least I hope so.
I won't tell you about my attempted post at s.e.d., but if you want
something to ponder, consider a LCLR induction heater with a center-tapped
work coil, current fed through a choke, with push-pull drive using mosfets
to ground at either end of the coil.
Now, according to theory, you should optimize power transfer by driving the
tank 90 degrees out of phase with tank voltage.
But on the self-resonating induction heater I built, the drive is in phase
with the tank voltage; that is, it switches when the tank cap has zero
voltage. No problems, works great.
I just found that kind of interesting, and thought you might too.
Guest
On Mar 31, 12:16 pm, "Michael Robinson" <kellrobin...@yahoo.com>
wrote:
Ah. You might find this page interesting then:
http://webpages.charter.net/dawill/tmoranwms/Elec_IndHeat1.html
Michael
wrote:
mrdarr...@gmail.com> wrote in message
news:6c44e344-a74b-4cbc-a930-140ce218f1d5@b7g2000pre.googlegroups.com...
On Mar 28, 9:38 am, "Michael Robinson" <kellrobin...@yahoo.com> wrote:
"John Fields" <jfie...@austininstruments.com> wrote in message
news:45tqs4t7d2omk2ho213a0gp4ilhhh2esk7@4ax.com...
On Fri, 27 Mar 2009 15:35:50 -0700 (PDT), JeffM <jef...@email.com
wrote:
Michael Robinson wrote:
"Michael Robinson" <kellrobin...@yahoo.com> wrote in message
news:gqj4ea$il7$1@aioe.org...
test
test reply
Do your testing in a group with TEST in its name, moron.
---
What if he wants to make sure that his post gets through to a group with
sci.electronics.basics in its name?
What's wrong with that?
JF
My last post at s.e.d. failed.
Well what was the post about? Come on, the anticipation is killing
us.
Michael Darrett
Well, I finally got the posting problem licked. At least I hope so.
I won't tell you about my attempted post at s.e.d., but if you want
something to ponder, consider a LCLR induction heater with a center-tapped
work coil, current fed through a choke, with push-pull drive using mosfets
to ground at either end of the coil.
Now, according to theory, you should optimize power transfer by driving the
tank 90 degrees out of phase with tank voltage.
But on the self-resonating induction heater I built, the drive is in phase
with the tank voltage; that is, it switches when the tank cap has zero
voltage. No problems, works great.
I just found that kind of interesting, and thought you might too.
Ah. You might find this page interesting then:
http://webpages.charter.net/dawill/tmoranwms/Elec_IndHeat1.html
Michael
M
Michael Robinson
Guest
<mrdarrett@gmail.com> wrote in message
news:cea76de1-e32c-4fd4-9981-47d315c9cd32@x1g2000prh.googlegroups.com...
On Mar 31, 12:16 pm, "Michael Robinson" <kellrobin...@yahoo.com>
wrote:
Ah. You might find this page interesting then:
http://webpages.charter.net/dawill/tmoranwms/Elec_IndHeat1.html
Michael
Nice. That's Tim Williams? He built a much more complicated induction
heater that he was posting on s.e.d about a while back.
Richie Burnett has a very informative web page on induction heating here:
http://www.richieburnett.co.uk/indheat.html
I didn't build my heater to do the kilowatt thing or melt metal. I needed
to make a (few) hundred watts to heat some metal tubing, and induction
heating is just so efficient I thought I'd give it a try. I got some ideas
from
4hv.org
Found a circuit they call the "Mazilli" and adapted it to my purposes.
Here's the original circuit that got me started:
http://forum.4hv.org/attachments/Flyback_driver.png
Obviously, if you adapt this for induction heating, there'll be no secondary
as in the diagram. Instead of driving the gates with resistors (!!!) I used
totem poles. Then the addition of a thermistor and comparator to turn the
thing on and off for temperature regulation. Of course, the story gets more
complicated, as it almost always does. I had startup problems at high power
levels where it would latch with one mosfet on instead of oscillating, but
found a way around that.
news:cea76de1-e32c-4fd4-9981-47d315c9cd32@x1g2000prh.googlegroups.com...
On Mar 31, 12:16 pm, "Michael Robinson" <kellrobin...@yahoo.com>
wrote:
mrdarr...@gmail.com> wrote in message
news:6c44e344-a74b-4cbc-a930-140ce218f1d5@b7g2000pre.googlegroups.com...
On Mar 28, 9:38 am, "Michael Robinson" <kellrobin...@yahoo.com> wrote:
"John Fields" <jfie...@austininstruments.com> wrote in message
news:45tqs4t7d2omk2ho213a0gp4ilhhh2esk7@4ax.com...
On Fri, 27 Mar 2009 15:35:50 -0700 (PDT), JeffM <jef...@email.com
wrote:
Michael Robinson wrote:
"Michael Robinson" <kellrobin...@yahoo.com> wrote in message
news:gqj4ea$il7$1@aioe.org...
test
test reply
Do your testing in a group with TEST in its name, moron.
---
What if he wants to make sure that his post gets through to a group
with
sci.electronics.basics in its name?
What's wrong with that?
JF
My last post at s.e.d. failed.
Well what was the post about? Come on, the anticipation is killing
us.
Michael Darrett
Well, I finally got the posting problem licked. At least I hope so.
I won't tell you about my attempted post at s.e.d., but if you want
something to ponder, consider a LCLR induction heater with a center-tapped
work coil, current fed through a choke, with push-pull drive using mosfets
to ground at either end of the coil.
Now, according to theory, you should optimize power transfer by driving
the
tank 90 degrees out of phase with tank voltage.
But on the self-resonating induction heater I built, the drive is in phase
with the tank voltage; that is, it switches when the tank cap has zero
voltage. No problems, works great.
I just found that kind of interesting, and thought you might too.
Ah. You might find this page interesting then:
http://webpages.charter.net/dawill/tmoranwms/Elec_IndHeat1.html
Michael
Nice. That's Tim Williams? He built a much more complicated induction
heater that he was posting on s.e.d about a while back.
Richie Burnett has a very informative web page on induction heating here:
http://www.richieburnett.co.uk/indheat.html
I didn't build my heater to do the kilowatt thing or melt metal. I needed
to make a (few) hundred watts to heat some metal tubing, and induction
heating is just so efficient I thought I'd give it a try. I got some ideas
from
4hv.org
Found a circuit they call the "Mazilli" and adapted it to my purposes.
Here's the original circuit that got me started:
http://forum.4hv.org/attachments/Flyback_driver.png
Obviously, if you adapt this for induction heating, there'll be no secondary
as in the diagram. Instead of driving the gates with resistors (!!!) I used
totem poles. Then the addition of a thermistor and comparator to turn the
thing on and off for temperature regulation. Of course, the story gets more
complicated, as it almost always does. I had startup problems at high power
levels where it would latch with one mosfet on instead of oscillating, but
found a way around that.
M
Michael Robinson
Guest
<mrdarrett@gmail.com> wrote in message
news:361ca78a-ffd3-4d97-95ec-8d758a49260b@f1g2000prb.googlegroups.com...
On Apr 1, 11:59 am, "Michael Robinson" <kellrobin...@yahoo.com> wrote:
Yep that's him. Was this the complicated version?
http://webpages.charter.net/dawill/tmoranwms/Elec_IndHeat6.html
That's the one I remembered.
I couldn't find it - remote linking not allowed. Mazilli and Mazili
didn't turn up anything. ???
Go to http://4hv.org, no need to register, just click on Forum and then
General Science and Electronics, then search for "driving mazilli zvs"
the top result is a thread that has a circuit diagram
Sounds interesting. I might just go induction heating for heating
liquids... place metal in a glass jar, apply power...
Thanks,
Michael
news:361ca78a-ffd3-4d97-95ec-8d758a49260b@f1g2000prb.googlegroups.com...
On Apr 1, 11:59 am, "Michael Robinson" <kellrobin...@yahoo.com> wrote:
mrdarr...@gmail.com> wrote in message
news:cea76de1-e32c-4fd4-9981-47d315c9cd32@x1g2000prh.googlegroups.com...
On Mar 31, 12:16 pm, "Michael Robinson" <kellrobin...@yahoo.com
wrote:
mrdarr...@gmail.com> wrote in message
news:6c44e344-a74b-4cbc-a930-140ce218f1d5@b7g2000pre.googlegroups.com...
On Mar 28, 9:38 am, "Michael Robinson" <kellrobin...@yahoo.com> wrote:
"John Fields" <jfie...@austininstruments.com> wrote in message
news:45tqs4t7d2omk2ho213a0gp4ilhhh2esk7@4ax.com...
On Fri, 27 Mar 2009 15:35:50 -0700 (PDT), JeffM <jef...@email.com
wrote:
Michael Robinson wrote:
"Michael Robinson" <kellrobin...@yahoo.com> wrote in message
news:gqj4ea$il7$1@aioe.org...
test
test reply
Do your testing in a group with TEST in its name, moron.
---
What if he wants to make sure that his post gets through to a group
with
sci.electronics.basics in its name?
What's wrong with that?
JF
My last post at s.e.d. failed.
Well what was the post about? Come on, the anticipation is killing
us.
Michael Darrett
Well, I finally got the posting problem licked. At least I hope so.
I won't tell you about my attempted post at s.e.d., but if you want
something to ponder, consider a LCLR induction heater with a
center-tapped
work coil, current fed through a choke, with push-pull drive using
mosfets
to ground at either end of the coil.
Now, according to theory, you should optimize power transfer by driving
the
tank 90 degrees out of phase with tank voltage.
But on the self-resonating induction heater I built, the drive is in
phase
with the tank voltage; that is, it switches when the tank cap has zero
voltage. No problems, works great.
I just found that kind of interesting, and thought you might too.
Ah. You might find this page interesting
then:http://webpages.charter.net/dawill/tmoranwms/Elec_IndHeat1.html
Michael
Nice. That's Tim Williams? He built a much more complicated induction
heater that he was posting on s.e.d about a while back.
Yep that's him. Was this the complicated version?
http://webpages.charter.net/dawill/tmoranwms/Elec_IndHeat6.html
That's the one I remembered.
Richie Burnett has a very informative web page on induction heating
here:http://www.richieburnett.co.uk/indheat.html
I didn't build my heater to do the kilowatt thing or melt metal. I needed
to make a (few) hundred watts to heat some metal tubing, and induction
heating is just so efficient I thought I'd give it a try. I got some ideas
from
4hv.org
Found a circuit they call the "Mazilli" and adapted it to my purposes.
Here's the original circuit that got me
started:http://forum.4hv.org/attachments/Flyback_driver.png
I couldn't find it - remote linking not allowed. Mazilli and Mazili
didn't turn up anything. ???
Go to http://4hv.org, no need to register, just click on Forum and then
General Science and Electronics, then search for "driving mazilli zvs"
the top result is a thread that has a circuit diagram
Obviously, if you adapt this for induction heating, there'll be no
secondary
as in the diagram. Instead of driving the gates with resistors (!!!) I
used
totem poles. Then the addition of a thermistor and comparator to turn the
thing on and off for temperature regulation. Of course, the story gets
more
complicated, as it almost always does. I had startup problems at high
power
levels where it would latch with one mosfet on instead of oscillating, but
found a way around that.
Sounds interesting. I might just go induction heating for heating
liquids... place metal in a glass jar, apply power...
Thanks,
Michael
Guest
On Apr 1, 11:59 am, "Michael Robinson" <kellrobin...@yahoo.com> wrote:
Yep that's him. Was this the complicated version?
http://webpages.charter.net/dawill/tmoranwms/Elec_IndHeat6.html
I couldn't find it - remote linking not allowed. Mazilli and Mazili
didn't turn up anything. ???
Sounds interesting. I might just go induction heating for heating
liquids... place metal in a glass jar, apply power...
Thanks,
Michael
mrdarr...@gmail.com> wrote in message
news:cea76de1-e32c-4fd4-9981-47d315c9cd32@x1g2000prh.googlegroups.com...
On Mar 31, 12:16 pm, "Michael Robinson" <kellrobin...@yahoo.com
wrote:
mrdarr...@gmail.com> wrote in message
news:6c44e344-a74b-4cbc-a930-140ce218f1d5@b7g2000pre.googlegroups.com...
On Mar 28, 9:38 am, "Michael Robinson" <kellrobin...@yahoo.com> wrote:
"John Fields" <jfie...@austininstruments.com> wrote in message
news:45tqs4t7d2omk2ho213a0gp4ilhhh2esk7@4ax.com...
On Fri, 27 Mar 2009 15:35:50 -0700 (PDT), JeffM <jef...@email.com
wrote:
Michael Robinson wrote:
"Michael Robinson" <kellrobin...@yahoo.com> wrote in message
news:gqj4ea$il7$1@aioe.org...
test
test reply
Do your testing in a group with TEST in its name, moron.
---
What if he wants to make sure that his post gets through to a group
with
sci.electronics.basics in its name?
What's wrong with that?
JF
My last post at s.e.d. failed.
Well what was the post about? Come on, the anticipation is killing
us.
Michael Darrett
Well, I finally got the posting problem licked. At least I hope so.
I won't tell you about my attempted post at s.e.d., but if you want
something to ponder, consider a LCLR induction heater with a center-tapped
work coil, current fed through a choke, with push-pull drive using mosfets
to ground at either end of the coil.
Now, according to theory, you should optimize power transfer by driving
the
tank 90 degrees out of phase with tank voltage.
But on the self-resonating induction heater I built, the drive is in phase
with the tank voltage; that is, it switches when the tank cap has zero
voltage. No problems, works great.
I just found that kind of interesting, and thought you might too.
Ah. You might find this page interesting then:http://webpages.charter.net/dawill/tmoranwms/Elec_IndHeat1.html
Michael
Nice. That's Tim Williams? He built a much more complicated induction
heater that he was posting on s.e.d about a while back.
Yep that's him. Was this the complicated version?
http://webpages.charter.net/dawill/tmoranwms/Elec_IndHeat6.html
Richie Burnett has a very informative web page on induction heating here:http://www.richieburnett.co.uk/indheat.html
I didn't build my heater to do the kilowatt thing or melt metal. I needed
to make a (few) hundred watts to heat some metal tubing, and induction
heating is just so efficient I thought I'd give it a try. I got some ideas
from
4hv.org
Found a circuit they call the "Mazilli" and adapted it to my purposes.
Here's the original circuit that got me started:http://forum.4hv.org/attachments/Flyback_driver.png
I couldn't find it - remote linking not allowed. Mazilli and Mazili
didn't turn up anything. ???
Obviously, if you adapt this for induction heating, there'll be no secondary
as in the diagram. Instead of driving the gates with resistors (!!!) I used
totem poles. Then the addition of a thermistor and comparator to turn the
thing on and off for temperature regulation. Of course, the story gets more
complicated, as it almost always does. I had startup problems at high power
levels where it would latch with one mosfet on instead of oscillating, but
found a way around that.
Sounds interesting. I might just go induction heating for heating
liquids... place metal in a glass jar, apply power...
Thanks,
Michael