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Jeff Liebermann
Guest
Fri Dec 23, 2011 5:47 pm
On Fri, 23 Dec 2011 07:34:25 -0800 (PST), klem kedidelhopper
<captainvideo462009_at_gmail.com> wrote:
Quote:
I suppose
I probably ought to look more at the capacitive "pen"approach too.
Does anyone know exactly what is inside that little "pen"? Lenny
Look on your pen and see if there's a patent number. Then search for
the patent with google:
<http://www.google.com/patents?hl=en>
There's usually a schematic or at least a block diagram.
--
Jeff Liebermann jeffl_at_cruzio.com
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060
http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
William Sommerwerck
Guest
Fri Dec 23, 2011 5:56 pm
Quote:
I probably ought to look more at the capacitive "pen"approach, too.
Does anyone know exactly what is inside that little "pen"?
I believe they use a FET to drive a lamp or other indicator. As FETs (can)
have a very high input impedance, it's possible to pick up 60Hz AC through
capacitive coupling.
Jeff Liebermann
Guest
Sat Dec 24, 2011 6:38 am
On Fri, 23 Dec 2011 08:47:43 -0800, Jeff Liebermann <jeffl_at_cruzio.com>
wrote:
Quote:
On Fri, 23 Dec 2011 07:34:25 -0800 (PST), klem kedidelhopper
captainvideo462009_at_gmail.com> wrote:
I suppose
I probably ought to look more at the capacitive "pen"approach too.
Does anyone know exactly what is inside that little "pen"? Lenny
Look on your pen and see if there's a patent number. Then search for
the patent with google:
http://www.google.com/patents?hl=en
There's usually a schematic or at least a block diagram.
Foundit.
<http://www.google.com/patents/US5877618>
Schematic in sheet #4. No FET on the input stage. It uses a 4069
CMOS hex inverter through a 10Meg resistor. Cheap.
--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831-336-2558
#
http://802.11junk.com jeffl_at_cruzio.com
#
http://www.LearnByDestroying.com AE6KS
William Sommerwerck
Guest
Sat Dec 24, 2011 1:11 pm
"Jeff Liebermann" <jeffl_at_cruzio.com> wrote in message
news:k8paf7h1n278p77pcntr9r3hapos7t0kmm_at_4ax.com...
Quote:
http://www.google.com/patents/US5877618
Schematic in sheet #4. No FET on the input stage. It uses
a 4069 CMOS hex inverter through a 10M resistor.
Uh... CMOS uses MOSFETs.
Jeff Liebermann
Guest
Sat Dec 24, 2011 5:51 pm
On Sat, 24 Dec 2011 04:11:49 -0800, "William Sommerwerck"
<grizzledgeezer_at_comcast.net> wrote:
Quote:
"Jeff Liebermann" <jeffl_at_cruzio.com> wrote in message
news:k8paf7h1n278p77pcntr9r3hapos7t0kmm_at_4ax.com...
http://www.google.com/patents/US5877618
Schematic in sheet #4. No FET on the input stage. It uses
a 4069 CMOS hex inverter through a 10M resistor.
Uh... CMOS uses MOSFETs.
Yes, but you said "a" FET which I read as a single JFET or MOSFET used
as an analog 60Hz amplifier. The CMOS gate has far more than one FET
in the input stage.
Pedantic-R-Us
--
Jeff Liebermann jeffl_at_cruzio.com
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060
http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
William Sommerwerck
Guest
Sat Dec 24, 2011 5:59 pm
"Jeff Liebermann" <jeffl_at_cruzio.com> wrote in message
news:400cf7pa4r872kdh4k1hhb8f6grlofn62v_at_4ax.com...
Quote:
On Sat, 24 Dec 2011 04:11:49 -0800, "William Sommerwerck"
grizzledgeezer_at_comcast.net> wrote:
"Jeff Liebermann" <jeffl_at_cruzio.com> wrote in message
news:k8paf7h1n278p77pcntr9r3hapos7t0kmm_at_4ax.com...
http://www.google.com/patents/US5877618
Schematic in sheet #4. No FET on the input stage. It uses
a 4069 CMOS hex inverter through a 10M resistor.
Uh... CMOS uses MOSFETs.
Yes, but you said "a" FET which I read as a single JFET or MOSFET
used as an analog 60Hz amplifier. The CMOS gate has far more than
one FET in the input stage.
Pedantic-R-Us
<mumble-mumble grumble>
Robert Macy
Guest
Mon Dec 26, 2011 4:21 pm
On Dec 24, 9:59 am, "William Sommerwerck" <grizzledgee...@comcast.net>
wrote:
Quote:
"Jeff Liebermann" <je...@cruzio.com> wrote in message
news:400cf7pa4r872kdh4k1hhb8f6grlofn62v_at_4ax.com...
On Sat, 24 Dec 2011 04:11:49 -0800, "William Sommerwerck"
grizzledgee...@comcast.net> wrote:
"Jeff Liebermann" <je...@cruzio.com> wrote in message
news:k8paf7h1n278p77pcntr9r3hapos7t0kmm_at_4ax.com...
http://www.google.com/patents/US5877618
Schematic in sheet #4. No FET on the input stage. It uses
a 4069 CMOS hex inverter through a 10M resistor.
Uh... CMOS uses MOSFETs.
Yes, but you said "a" FET which I read as a single JFET or MOSFET
used as an analog 60Hz amplifier. The CMOS gate has far more than
one FET in the input stage.
Pedantic-R-Us
mumble-mumble grumble
LOL !!!
David Lesher
Guest
Thu Feb 16, 2012 6:29 am
a) Some transfer switches are whole-house, being the first
step downstream from the meter.
b) Others are fed by the main panel, and feed a subpanel of
priority loads.
In the case of A, there is a specific metering tap to go to the
line monitoring, even if that's solely a "LINE POWER" lamp.
In either case, stupidity like suicide cords should be
tossed.
--
A host is a host from coast to coast.................wb8foz_at_nrk.com
& no one will talk to a host that's close........[v].(301) 56-LINUX
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433
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