magnetic field

What's wrong with a PIC?

They now have the PIC12HV615 and the PIC16HV616
that have built-in voltage regulator,

The difficult part is the isolation. But you can make a very simple DC-DC
converter on the 12 VDC generator side,

to produce an unregulated raw 12-20
VDC nominal supply on the battery side. Then it is easy to make an
efficient current regulated, voltage limited charging supply similar to the
PWM LED drivers that are being designed and built by many companies (Zetex,
Linear, TI, etc.). The PIC can be programmed for various cell chemistries
and charging profiles, and also compensate for temperature.

I have also seen a PIC circuit for Lithium cells that can be chained to
others in a series battery pack, and it will communicate with the others to
provide an optimal charge for all, and shut down if there is danger of
current reversal.

Paul

Hello!

I would need an PWM controller for a 24V 50W brushed DC motor. I made one
like on this link, but it's working very bad, it work good when is alive but
MOSFET's gone dead quick.

http://www.ozitronics.com/docs/k166.pdf

I allready did place shotky on every mosfet, still burning, also I did try
with some other gate resistors and so....problem is in dead time then....but
this design end then.

On Sat, 10 May 2008 18:15:24 +0200, "mtech"
marin.zorica(nospam)@zd.t-com.hr> wrote:

I allready did place shotky on every mosfet, still burning, also I did try
with some other gate resistors and so....problem is in dead time then....but
this design end then.

Um, this crcuit PWMs at 270Hz.

10K gate drive resistors.10mA gate drive currents. Give me a break.

As long as there's no actual shoot-through or gate overstress failure,
and as long as the 324 can actually shut the Pchannel parts off,
theres no reason why the circuit shouldn't work below 20V. It
obviously does, to a certain extent.

Some kind of ripple current, though.

If all you're doing is introducing better drivers, you could probably
retain the electronics to generate the control signals, providing that
they're troubleshot before applying juice.

On Sat, 10 May 2008 16:58:14 +0200, "mtech"
marin.zorica(nospam)@zd.t-com.hr> wrote:


Hello!

I would need an PWM controller for a 24V 50W brushed DC motor. I made one
like on this link, but it's working very bad, it work good when is alive but
MOSFET's gone dead quick.

http://www.ozitronics.com/docs/k166.pdf



That's a stunningly bad circuit, but then most circuits are stunningly
bad.

These work nicely:

http://www.national.com/mpf/LM/LMD18400.html

but I'd add some clamp schottkies for luck.


John

I have had my second thumbdrive fail. It's a 1 gig Imation. It started with
files in folders becoming corrupted. ie. one folder had a lot of stuff in it and
these weird files appearing. and Explorer cannot delete them either.

So I formatted the drive and copied the data back onto it from backups. Then
other problems appeared, all file related.

So I must assume that the unit's stuffed.

The likes of Harvey Norman have barrells of thumbdrives of various sizes and
brands in the bargain bins as you walk in the door. Just wondering if any brands
stick out whether for good reasons or for bad.

Snapper <snapp...@y7mail.com.invalid> writes:
I have had my second thumbdrive fail. It's a 1 gig Imation. It started with
files in folders becoming corrupted. ie. one folder had a lot of stuff in it and
these weird files appearing. and Explorer cannot delete them either.
So I formatted the drive and copied the data back onto it from backups. Then
other problems appeared, all file related.
So I must assume that the unit's stuffed.
The likes of Harvey Norman have barrells of thumbdrives of various sizes and
brands in the bargain bins as you walk in the door. Just wondering if any brands
stick out whether for good reasons or for bad.

Stick with SanDisk. I use an 8 GB one without a problem. The shit ones
break, had very bad device driver support, and will make Windows crash and
burn without warning.

--
Sheik Yerbhouti - the popular ambassador to Australia of the Arab Royal States
Anonymous I welcome you loving emails. Come and view my free image galleries at:http://www.southwestslutbags.com/gallery2/main.php?g2_itemId=2941http://www.technotranceravesex.net/gallery2/main.php?g2_itemId=20555

Snapper <snapper1_at_y7mail.com.invalid> writes:

I have had my second thumbdrive fail. It's a 1 gig Imation. It started with
files in folders becoming corrupted. ie. one folder had a lot of stuff in it and
these weird files appearing. and Explorer cannot delete them either.

So I formatted the drive and copied the data back onto it from backups. Then
other problems appeared, all file related.

So I must assume that the unit's stuffed.

The likes of Harvey Norman have barrells of thumbdrives of various sizes and
brands in the bargain bins as you walk in the door. Just wondering if any
brands stick out whether for good reasons or for bad.

Stick with SanDisk. I use an 8 GB one without a problem. The shit ones
break, had very bad device driver support, and will make Windows crash and
burn without warning.

Stick with SanDisk. I use an 8 GB one without a problem. The shit ones
break, had very bad device driver support, and will make Windows crash and
burn without warning.

Sheik Yerbhouti wrote:

Stick with SanDisk. I use an 8 GB one without a problem. The shit ones
break, had very bad device driver support, and will make Windows crash
and
burn without warning.

yep, the Sand disk units are pretty good. If you happen to get the
Cruzer version with the U3 system and applications, just delete it. They
often have these on special. There is an un-installer on their web page,
or you can reformat, but it is a simple task.

Don...

On Jul 5, 8:16 pm, Sheik Yerbhouti <s...@lios.apana.org.au> wrote:
Snapper <snapp...@y7mail.com.invalid> writes:
I have had my second thumbdrive fail. It's a 1 gig Imation. It started with
files in folders becoming corrupted. ie. one folder had a lot of stuff in it and
these weird files appearing. and Explorer cannot delete them either.
So I formatted the drive and copied the data back onto it from backups. Then
other problems appeared, all file related.
So I must assume that the unit's stuffed.
The likes of Harvey Norman have barrells of thumbdrives of various sizes and
brands in the bargain bins as you walk in the door. Just wondering if any brands
stick out whether for good reasons or for bad.
Stick with SanDisk. I use an 8 GB one without a problem. The shit ones
break, had very bad device driver support, and will make Windows crash and
burn without warning.

--
Sheik Yerbhouti - the popular ambassador to Australia of the Arab Royal States
Anonymous I welcome you loving emails. Come and view my free image galleries at:http://www.southwestslutbags.com/gallery2/main.php?g2_itemId=2941http://www.technotranceravesex.net/gallery2/main.php?g2_itemId=20555


HAVE used a couple of kingston 4gig thumbdrives since january and had
no problems with them.

FYI - TG Ideas LLC has recently launched a new blog "Interfacing with
the Doctor Within" -http://doctor-within.blogspot.com/

There seems to be a "Doctor Within" that takes care of most of the
body functions, with or without our help or the help of a medical
professional.  Sometimes, however, the "Doctor Within" might need help
from the outside to complete the body repairs.  Currently we only
"look in" to fix the health problem by our medical tests, etc. We
don't  “ask” the "Doctor Within" what it needs to fix itself. This new
blog lays the foundation for better accessing and investigating the
"Doctor Within", perhaps by electronic means.

TG Ideas LLC has created this blog to promote the use of science to
record and explore the “intuitive messages” the body, mind, and spirit
are trying to tell us about our health and health of others. Up to
now, we could only say or write these "intuitive messages".
Throughout the world, there is much research being done on "Brain
Computer Interfaces" that show brain or mind activity.  On the other
hand, very little research is being done on to automatically
recording  "intuitive messages". By doing so, we could scientifically
study and improve on this process, and maybe someday, have a device to
"Interface with the Doctor Within".  This concept might just be a
solution to high health care costs.

Please feel free to visit and add your comments, research,
experimentation in this area.

Thanks
Tom - TG Ideas LLC

kreed wrote:

On Jul 5, 8:16 pm, Sheik Yerbhouti <s...@lios.apana.org.au> wrote:

Snapper <snapp...@y7mail.com.invalid> writes:

I have had my second thumbdrive fail. It's a 1 gig Imation. It
started with
files in folders becoming corrupted. ie. one folder had a lot of
stuff in it and
these weird files appearing. and Explorer cannot delete them either.
So I formatted the drive and copied the data back onto it from
backups. Then
other problems appeared, all file related.
So I must assume that the unit's stuffed.
The likes of Harvey Norman have barrells of thumbdrives of various
sizes and
brands in the bargain bins as you walk in the door. Just wondering
if any brands
stick out whether for good reasons or for bad.

Stick with SanDisk. I use an 8 GB one without a problem. The shit ones
break, had very bad device driver support, and will make Windows
crash and
burn without warning.

--
Sheik Yerbhouti - the popular ambassador to Australia of the Arab
Royal States
Anonymous I welcome you loving emails. Come and view my free image
galleries
at:http://www.southwestslutbags.com/gallery2/main.php?g2_itemId=2941http://www.technotranceravesex.net/gallery2/main.php?g2_itemId=20555




HAVE used a couple of kingston 4gig thumbdrives since january and had
no problems with them.


Same here. Do NOT buy Astone drives. Both of the ones I've had (512MB
and 4GB) have failed for no discernable reason, and either Astone or the
distributor did not act well/stuffed around the retailer when the latter
drive was sent back for warranty replacement.

Ari

Leaving the unit in the USB jack with the write protect off does a lot

Snapper <snapper1_at_y7mail.com.invalid> writes:

I have had my second thumbdrive fail. It's a 1 gig Imation. It started
with
files in folders becoming corrupted. ie. one folder had a lot of stuff in
it and
these weird files appearing. and Explorer cannot delete them either.

So I formatted the drive and copied the data back onto it from backups.
Then
other problems appeared, all file related.

So I must assume that the unit's stuffed.

The likes of Harvey Norman have barrells of thumbdrives of various sizes
and
brands in the bargain bins as you walk in the door. Just wondering if any
brands
stick out whether for good reasons or for bad.

Stick with SanDisk. I use an 8 GB one without a problem. The shit ones
break, had very bad device driver support, and will make Windows crash and
burn without warning.