J
Julian Barnes
Guest
On Mon, 22 Feb 2016 16:55:46 -0800, George Herold wrote:
TEC's? What's they?
TEC's? What's they?
P
Phil Allison
Guest
Chris wrote:
** Half witted, autistic pigs like you are dime a dozen.
Vermin on two legs.
FOAD.
..... Phil
** Half witted, autistic pigs like you are dime a dozen.
Vermin on two legs.
FOAD.
..... Phil
G
George Herold
Guest
On Tuesday, February 23, 2016 at 6:08:00 AM UTC-5, Julian Barnes wrote:
Thermo-Electric-Coolers.. made with diodes... well alternating slabs of
n and p semi-conductor... close enough to a diode in my book.
George H.
Thermo-Electric-Coolers.. made with diodes... well alternating slabs of
n and p semi-conductor... close enough to a diode in my book.
George H.
J
jfeng@my-deja.com
Guest
On Tuesday, February 23, 2016 at 12:45:53 AM UTC-8, Cursitor Doom wrote:
On Mon, 22 Feb 2016 17:55:18 -0800, jfeng@my-deja.com wrote:
In ther early 1970s, one of my friends got his Ph.D. studying the noise
from a germanium diode.
So... is he still single?
No. He is dead. But he was twice-married.
W
whit3rd
Guest
On Monday, February 22, 2016 at 12:42:10 PM UTC-8, Chris wrote:
We almost forgot one:
grounding protector (for corrosion problems on metal
hulls when docked and on shore-supplied power)
We almost forgot one:
grounding protector (for corrosion problems on metal
hulls when docked and on shore-supplied power)
M
Michael A. Terrell
Guest
M Philbrook wrote:
No. Forget them, since they don't exist.
No. Forget them, since they don't exist.
M
Michael A. Terrell
Guest
John Larkin wrote:
You forgot 'Stabistor' diodes.
You forgot 'Stabistor' diodes.
C
Cursitor Doom
Guest
On Wed, 24 Feb 2016 02:39:02 -0500, Michael A. Terrell wrote:
I assume he meant *varicap* diodes (used for tuning RF circuits).
I assume he meant *varicap* diodes (used for tuning RF circuits).
C
Cursitor Doom
Guest
On Wed, 24 Feb 2016 09:37:16 -0800, John Larkin wrote:
> But a stabistor is covered under "Voltage reference."
Is it *really* a voltage reference, though?
> But a stabistor is covered under "Voltage reference."
Is it *really* a voltage reference, though?
C
Cursitor Doom
Guest
On Wed, 24 Feb 2016 09:37:46 -0800, John Larkin wrote:
> How does that work?
Sacrificial anode I would imagine.
> How does that work?
Sacrificial anode I would imagine.
G
George Herold
Guest
On Wednesday, February 24, 2016 at 1:01:35 PM UTC-5, Cursitor Doom wrote:
I never heard of a stabistor,
http://www.nxp.com/documents/data_sheet/BAS17.pdf
Sorta 60 mV/ decade of current... Isn't that like a regular
diode? (Diode connected transistor?)
George H.
I never heard of a stabistor,
http://www.nxp.com/documents/data_sheet/BAS17.pdf
Sorta 60 mV/ decade of current... Isn't that like a regular
diode? (Diode connected transistor?)
George H.
W
whit3rd
Guest
On Wednesday, February 24, 2016 at 9:37:50 AM UTC-8, John Larkin wrote:
Instead of grounding the boat (hull, fittings) straight to the third-prong
of the power from the dock, that hull-ground gets connected to earth-ground through
two or three antiparalleled diodes. This allows the hull to keep its anodic
protection (slightly negative voltage with respect to the water) even though
the local ground stake is in soil with good conductance to the wet.
Instead of grounding the boat (hull, fittings) straight to the third-prong
of the power from the dock, that hull-ground gets connected to earth-ground through
two or three antiparalleled diodes. This allows the hull to keep its anodic
protection (slightly negative voltage with respect to the water) even though
the local ground stake is in soil with good conductance to the wet.
W
whit3rd
Guest
On Wednesday, February 24, 2016 at 12:38:54 PM UTC-8, George Herold wrote:
More important, is that the forward voltage versus currrent and temperature is tightly specified;
the intent is to model the forward voltage of a (usually power) transistor Vbe,
so as to bias its base.
If you diode-check a diode, and it's 0.65V at 1 mA, or 0.75V at 1 mA, it's probably good.
The BAS17 stabistor, at 25 C, would be out-of-tolerance (too low at 0.65V, and too high at 0.75V).
Stabistors gotta match the particular transistors, so that kind of design in an audio
amp means you can't always repair with an 'equivalent' transistor when the original
burns up. The clue that your dead amp uses a stabistor, is the little diode
attached to the big heatsink.
More important, is that the forward voltage versus currrent and temperature is tightly specified;
the intent is to model the forward voltage of a (usually power) transistor Vbe,
so as to bias its base.
If you diode-check a diode, and it's 0.65V at 1 mA, or 0.75V at 1 mA, it's probably good.
The BAS17 stabistor, at 25 C, would be out-of-tolerance (too low at 0.65V, and too high at 0.75V).
Stabistors gotta match the particular transistors, so that kind of design in an audio
amp means you can't always repair with an 'equivalent' transistor when the original
burns up. The clue that your dead amp uses a stabistor, is the little diode
attached to the big heatsink.
J
John Larkin
Guest
On Mon, 22 Feb 2016 18:45:59 -0500, M Philbrook
<jamie_ka1lpa@charter.net> wrote:
The ones with the big black knobs on top?
--
John Larkin Highland Technology, Inc
lunatic fringe electronics
<jamie_ka1lpa@charter.net> wrote:
The ones with the big black knobs on top?
--
John Larkin Highland Technology, Inc
lunatic fringe electronics
J
John Larkin
Guest
On Wed, 24 Feb 2016 02:40:16 -0500, "Michael A. Terrell"
<mike.terrell@earthlink.net> wrote:
I never claimed to include all possible uses.
But a stabistor is covered under "Voltage reference."
--
John Larkin Highland Technology, Inc
lunatic fringe electronics
<mike.terrell@earthlink.net> wrote:
I never claimed to include all possible uses.
But a stabistor is covered under "Voltage reference."
--
John Larkin Highland Technology, Inc
lunatic fringe electronics
J
John Larkin
Guest
On Wed, 24 Feb 2016 01:42:38 -0800 (PST), whit3rd <whit3rd@gmail.com>
wrote:
How does that work?
--
John Larkin Highland Technology, Inc
lunatic fringe electronics
wrote:
How does that work?
--
John Larkin Highland Technology, Inc
lunatic fringe electronics
M
M Philbrook
Guest
In article <nakbqo$6j7$1@dont-email.me>, curd@notformail.com says...
yes of course..
jamie
yes of course..
jamie
M
M Philbrook
Guest
In article <reqrcbd1bvqvfbqdvv3u5gse2vie60sf57@4ax.com>,
jjlarkin@highlandtechnology.com says...
obvious John I made a mistake,,. we all do that from time to time..
After 10 hour days, just about everyday, your mind gets a little
mixed up.
Varicap
Jamie
jjlarkin@highlandtechnology.com says...
obvious John I made a mistake,,. we all do that from time to time..
After 10 hour days, just about everyday, your mind gets a little
mixed up.
Varicap
Jamie
J
John Larkin
Guest
On Wed, 24 Feb 2016 18:40:05 -0500, M Philbrook
<jamie_ka1lpa@charter.net> wrote:
It does remind us of trigistor/diac diodes, like the ones used in
dimmers. They are really PNPN structures, but they have 2 leads so
people call them diodes.
--
John Larkin Highland Technology, Inc
lunatic fringe electronics
<jamie_ka1lpa@charter.net> wrote:
It does remind us of trigistor/diac diodes, like the ones used in
dimmers. They are really PNPN structures, but they have 2 leads so
people call them diodes.
--
John Larkin Highland Technology, Inc
lunatic fringe electronics
B
Bob Masta
Guest
On Mon, 22 Feb 2016 20:39:09 -0000 (UTC), Chris
<cbx@noreply.com> wrote:
Nobody seems to have mentioned the ever-popular tunnel
diode! Back in the '60s-'70s they were the heart of
ridiculously-simple FM transmitters. I believe Tektronix
used them for fast rise-time calibrators, until they went
the way of the unijunction transistor. (Also wildly popular
for a while.)
Best regards,
Bob Masta
DAQARTA v9.00
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
Frequency Counter, Pitch Track, Pitch-to-MIDI
FREE 8-channel Signal Generator, DaqMusiq generator
Science with your sound card!
<cbx@noreply.com> wrote:
Nobody seems to have mentioned the ever-popular tunnel
diode! Back in the '60s-'70s they were the heart of
ridiculously-simple FM transmitters. I believe Tektronix
used them for fast rise-time calibrators, until they went
the way of the unijunction transistor. (Also wildly popular
for a while.)
Best regards,
Bob Masta
DAQARTA v9.00
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
Frequency Counter, Pitch Track, Pitch-to-MIDI
FREE 8-channel Signal Generator, DaqMusiq generator
Science with your sound card!