D
dave
Guest
On 01/23/2014 06:45 AM, Michael A. Terrell wrote:
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Anyone help me with component ID for X5DIJ-SX039C laptop (k5
M
Michael A. Terrell
Guest
dave wrote:
It's a solid state diode that oscillates. DC in, and ~10 GHZ out.
Search on Gunnplexer. You see them on automatic doors in almost every
store. A microwave mixer diode takes a sample from the Gunn diode and
compares it to any reflected signals. This results in a low frequency
signal that is detected, amplified and signals the door to open. How can
a passive diode do that?
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
On 01/23/2014 06:45 AM, Michael A. Terrell wrote:
dave wrote:
On 01/21/2014 03:04 PM, Michael A. Terrell wrote:
dave wrote:
On 01/21/2014 07:24 AM, Mike Tomlinson wrote:
In article <v22pd9hm1r5br9004o4o22dg4052p3tcdm@4ax.com>, Jeff Liebermann
jeffl@cruzio.com> writes
http://www.learnbydestroying.com/jeffl/crud/asus-k501j.jpg
The "hole" in the burnt out component is characteristic of applying
reverse polarity to an active device such as a diode. I would guess
that the diode exploded, blowing the top off the epoxy package.
The 8-pin IC next to it also looks burnt.
To the OP: forget it, this is not economically repairable. Buy your
daughter a new machine and use the correct charger in future.
A diode is not an active device.
Then explain the Gunn Diode. DC in, RF out. How about LEDs? DC in,
Photons out.
An active device is any type of circuit component with the ability to
electrically control electron flow (electricity controlling
electricity). In order for a circuit to be properly called electronic,
it must contain at least one active device. Components incapable of
controlling current by means of another electrical signal are called
passive devices. Resistors, capacitors, inductors, transformers, and
even diodes are all considered passive devices.
http://www.allaboutcircuits.com/vol_3/chpt_1/2.html
How does the Gunn diode oscillate without gain? How does it have
gain, if it isn't an active component?
It is not a switch or a valve.
It's a solid state diode that oscillates. DC in, and ~10 GHZ out.
Search on Gunnplexer. You see them on automatic doors in almost every
store. A microwave mixer diode takes a sample from the Gunn diode and
compares it to any reflected signals. This results in a low frequency
signal that is detected, amplified and signals the door to open. How can
a passive diode do that?
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
D
dave
Guest
On 01/23/2014 06:05 PM, Michael A. Terrell wrote:
Like I said. You can hit a piece of quartz with a hammer and it will
oscillate; that doesn't mean it's considered and active device. An
active device uses one signal [current, voltage] to control another. As
in amplify or switch. Thermionic valve, transistor, SCR, Triac is what
we are going for.
dave wrote:
On 01/23/2014 06:45 AM, Michael A. Terrell wrote:
It is not a switch or a valve.
It's a solid state diode that oscillates. DC in, and ~10 GHZ out.
Search on Gunnplexer. You see them on automatic doors in almost every
store. A microwave mixer diode takes a sample from the Gunn diode and
compares it to any reflected signals. This results in a low frequency
signal that is detected, amplified and signals the door to open. How can
a passive diode do that?
Like I said. You can hit a piece of quartz with a hammer and it will
oscillate; that doesn't mean it's considered and active device. An
active device uses one signal [current, voltage] to control another. As
in amplify or switch. Thermionic valve, transistor, SCR, Triac is what
we are going for.
M
Michael Black
Guest
On Fri, 24 Jan 2014, dave wrote:
But, that piece of quartz, the output will start decaying in volume almost
immediately. It requires an active device to keep that going.
Michael
On 01/23/2014 06:05 PM, Michael A. Terrell wrote:
dave wrote:
On 01/23/2014 06:45 AM, Michael A. Terrell wrote:
It is not a switch or a valve.
It's a solid state diode that oscillates. DC in, and ~10 GHZ out.
Search on Gunnplexer. You see them on automatic doors in almost every
store. A microwave mixer diode takes a sample from the Gunn diode and
compares it to any reflected signals. This results in a low frequency
signal that is detected, amplified and signals the door to open. How can
a passive diode do that?
Like I said. You can hit a piece of quartz with a hammer and it will
oscillate; that doesn't mean it's considered and active device. An active
device uses one signal [current, voltage] to control another. As in amplify
or switch. Thermionic valve, transistor, SCR, Triac is what we are going for.
I can't keep track of this argument.
But, that piece of quartz, the output will start decaying in volume almost
immediately. It requires an active device to keep that going.
Michael
M
Michael A. Terrell
Guest
Michael Black wrote:
Dave is as clueless as Allison. He would freak if he saw a 'carbon
amplifier' in operation.
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
On Fri, 24 Jan 2014, dave wrote:
On 01/23/2014 06:05 PM, Michael A. Terrell wrote:
dave wrote:
On 01/23/2014 06:45 AM, Michael A. Terrell wrote:
It is not a switch or a valve.
It's a solid state diode that oscillates. DC in, and ~10 GHZ out.
Search on Gunnplexer. You see them on automatic doors in almost every
store. A microwave mixer diode takes a sample from the Gunn diode and
compares it to any reflected signals. This results in a low frequency
signal that is detected, amplified and signals the door to open. How can
a passive diode do that?
Like I said. You can hit a piece of quartz with a hammer and it will
oscillate; that doesn't mean it's considered and active device. An active
device uses one signal [current, voltage] to control another. As in amplify
or switch. Thermionic valve, transistor, SCR, Triac is what we are going for.
I can't keep track of this argument.
But, that piece of quartz, the output will start decaying in volume almost
immediately. It requires an active device to keep that going.
Dave is as clueless as Allison. He would freak if he saw a 'carbon
amplifier' in operation.
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
M
Michael A. Terrell
Guest
dave wrote:
No, it will crush the quartz, resulting in one spike as it breaks up.
Like a 'Carbon Amplifier'?
A rectifier is a switch. Diodes are used as mixers, and the
rectifiers a poorly designed power supply can generate RF that is
coupled into the power line.
Sigh. Small minds like yours will never learn anything.
http://en.wikipedia.org/wiki/Gunn_diode
The Gunn diode is based on the Gunn effect, and both are named for the
physicist J. B. Gunn who, at IBM in 1962, discovered the effect because
he refused to accept inconsistent experimental results in gallium
arsenide as "noise", and tracked down the cause. Alan Chynoweth, of Bell
Telephone Laboratories, showed in June 1965 that only a
transferred-electron mechanism could explain the experimental
results.[3] The interpretation refers to the Ridley-Watkins-Hilsum
theory.
The Gunn effect, and its relation to the Watkins-Ridley-Hilsum effect
entered the monograph literature in the early 1970s, e.g. in books on
transferred electron devices[4] and, more recently on nonlinear wave
methods for charge transport.[5] Several other books that provided the
same coverage were published in the intervening years, and can be found
by searching library and bookseller catalogues on Gunn effect.
http://en.wikipedia.org/wiki/Esaki_diode AKA Tunnel diode was invented
in 1958. It was used as a 14 GHz amplifier in Intelsat V satellite
receiver.
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
On 01/23/2014 06:05 PM, Michael A. Terrell wrote:
dave wrote:
On 01/23/2014 06:45 AM, Michael A. Terrell wrote:
It is not a switch or a valve.
It's a solid state diode that oscillates. DC in, and ~10 GHZ out.
Search on Gunnplexer. You see them on automatic doors in almost every
store. A microwave mixer diode takes a sample from the Gunn diode and
compares it to any reflected signals. This results in a low frequency
signal that is detected, amplified and signals the door to open. How
can a passive diode do that?
Like I said. You can hit a piece of quartz with a hammer and it will
oscillate; that doesn't mean it's considered and active device.
No, it will crush the quartz, resulting in one spike as it breaks up.
to control another.
Like a 'Carbon Amplifier'?
As in amplify or switch. Thermionic valve, transistor, SCR, Triac is
what we are going for.
A rectifier is a switch. Diodes are used as mixers, and the
rectifiers a poorly designed power supply can generate RF that is
coupled into the power line.
Sigh. Small minds like yours will never learn anything.
http://en.wikipedia.org/wiki/Gunn_diode
The Gunn diode is based on the Gunn effect, and both are named for the
physicist J. B. Gunn who, at IBM in 1962, discovered the effect because
he refused to accept inconsistent experimental results in gallium
arsenide as "noise", and tracked down the cause. Alan Chynoweth, of Bell
Telephone Laboratories, showed in June 1965 that only a
transferred-electron mechanism could explain the experimental
results.[3] The interpretation refers to the Ridley-Watkins-Hilsum
theory.
The Gunn effect, and its relation to the Watkins-Ridley-Hilsum effect
entered the monograph literature in the early 1970s, e.g. in books on
transferred electron devices[4] and, more recently on nonlinear wave
methods for charge transport.[5] Several other books that provided the
same coverage were published in the intervening years, and can be found
by searching library and bookseller catalogues on Gunn effect.
http://en.wikipedia.org/wiki/Esaki_diode AKA Tunnel diode was invented
in 1958. It was used as a 14 GHz amplifier in Intelsat V satellite
receiver.
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
J
Jerry Peters
Guest
dave <ricketzz@earthlink.net> wrote:
So a relay is an active device?
On 01/23/2014 06:05 PM, Michael A. Terrell wrote:
dave wrote:
On 01/23/2014 06:45 AM, Michael A. Terrell wrote:
It is not a switch or a valve.
It's a solid state diode that oscillates. DC in, and ~10 GHZ out.
Search on Gunnplexer. You see them on automatic doors in almost every
store. A microwave mixer diode takes a sample from the Gunn diode and
compares it to any reflected signals. This results in a low frequency
signal that is detected, amplified and signals the door to open. How can
a passive diode do that?
Like I said. You can hit a piece of quartz with a hammer and it will
oscillate; that doesn't mean it's considered and active device. An
active device uses one signal [current, voltage] to control another. As
in amplify or switch. Thermionic valve, transistor, SCR, Triac is what
we are going for.
An active device uses one signal [current, voltage] to control another.
So a relay is an active device?
Guest
There ya go. Forget wiki, Webster's and all that, ask Digikey !
P
Phil Allison
Guest
"Jerry Peters"
** Trying to define a word or term *out of context* is doomed to failure.
A relay is not an *electronics* device - it is an electro mechanical one
that predates "electronics" by about 100 years.
The invention of the vacuum tube triode kicked it off but the word
"electronics" was not applied until the late 1940s - to cover the fields of
radio, radar, computers and TV.
It had a previous life as the name of a branch of physics
http://en.wikipedia.org/wiki/Electronics
FYI: if yo want to buy a diode, I suggest you do not waste time looking it
up in an electronics catalogue under the heading of "passive components".
..... Phil
An active device uses one signal [current, voltage] to control another.
So a relay is an active device?
** Trying to define a word or term *out of context* is doomed to failure.
A relay is not an *electronics* device - it is an electro mechanical one
that predates "electronics" by about 100 years.
The invention of the vacuum tube triode kicked it off but the word
"electronics" was not applied until the late 1940s - to cover the fields of
radio, radar, computers and TV.
It had a previous life as the name of a branch of physics
http://en.wikipedia.org/wiki/Electronics
FYI: if yo want to buy a diode, I suggest you do not waste time looking it
up in an electronics catalogue under the heading of "passive components".
..... Phil
P
Phil Allison
Guest
<jurb6006@gmail.com>
** Get cancer and die you criminal fucking nut case.
** Get cancer and die you criminal fucking nut case.
Guest
On Saturday, January 25, 2014 8:44:18 PM UTC-5, Phil Allison wrote:
> <> ** Get cancer and die you criminal fucking nut case.
You suck aborigines dick with that mouth ?
> <> ** Get cancer and die you criminal fucking nut case.
You suck aborigines dick with that mouth ?
D
dave
Guest
On 01/24/2014 03:09 PM, Michael A. Terrell wrote:
I will cop to "clueless". That's why I look stuff up first. A tube,or a
transistor (any gated device really) is an active device. They control
one current with another. They amplify. They switch. They invert
polarity sometimes.
Michael Black wrote:
On Fri, 24 Jan 2014, dave wrote:
On 01/23/2014 06:05 PM, Michael A. Terrell wrote:
dave wrote:
On 01/23/2014 06:45 AM, Michael A. Terrell wrote:
It is not a switch or a valve.
It's a solid state diode that oscillates. DC in, and ~10 GHZ out.
Search on Gunnplexer. You see them on automatic doors in almost every
store. A microwave mixer diode takes a sample from the Gunn diode and
compares it to any reflected signals. This results in a low frequency
signal that is detected, amplified and signals the door to open. How can
a passive diode do that?
Like I said. You can hit a piece of quartz with a hammer and it will
oscillate; that doesn't mean it's considered and active device. An active
device uses one signal [current, voltage] to control another. As in amplify
or switch. Thermionic valve, transistor, SCR, Triac is what we are going for.
I can't keep track of this argument.
But, that piece of quartz, the output will start decaying in volume almost
immediately. It requires an active device to keep that going.
Dave is as clueless as Allison. He would freak if he saw a 'carbon
amplifier' in operation.
I will cop to "clueless". That's why I look stuff up first. A tube,or a
transistor (any gated device really) is an active device. They control
one current with another. They amplify. They switch. They invert
polarity sometimes.
D
dave
Guest
On 01/24/2014 03:22 PM, Michael A. Terrell wrote:
Oscillators do not use one signal to control another. A Gunn diode is a
lot like a neon lamp meets quartz crystal. Not a switch. Not an amplifier.
It's a relatively stupid minor point. I looked it up. I am not going to
be convinced with silliness like "carbon amplifiers".
dave wrote:
On 01/23/2014 06:05 PM, Michael A. Terrell wrote:
dave wrote:
On 01/23/2014 06:45 AM, Michael A. Terrell wrote:
It is not a switch or a valve.
It's a solid state diode that oscillates. DC in, and ~10 GHZ out.
Search on Gunnplexer. You see them on automatic doors in almost every
store. A microwave mixer diode takes a sample from the Gunn diode and
compares it to any reflected signals. This results in a low frequency
signal that is detected, amplified and signals the door to open. How
can a passive diode do that?
Like I said. You can hit a piece of quartz with a hammer and it will
oscillate; that doesn't mean it's considered and active device.
No, it will crush the quartz, resulting in one spike as it breaks up.
An active device uses one signal [current, voltage] to control another.
Like a 'Carbon Amplifier'?
As in amplify or switch. Thermionic valve, transistor, SCR, Triac is
what we are going for.
A rectifier is a switch. Diodes are used as mixers, and the
rectifiers a poorly designed power supply can generate RF that is
coupled into the power line.
Sigh. Small minds like yours will never learn anything.
Oscillators do not use one signal to control another. A Gunn diode is a
lot like a neon lamp meets quartz crystal. Not a switch. Not an amplifier.
It's a relatively stupid minor point. I looked it up. I am not going to
be convinced with silliness like "carbon amplifiers".
D
dave
Guest
On 01/25/2014 01:21 PM, Jerry Peters wrote:
A relay is a solenoid (no) and a switch (no).
dave <ricketzz@earthlink.net> wrote:
On 01/23/2014 06:05 PM, Michael A. Terrell wrote:
dave wrote:
On 01/23/2014 06:45 AM, Michael A. Terrell wrote:
It is not a switch or a valve.
It's a solid state diode that oscillates. DC in, and ~10 GHZ out.
Search on Gunnplexer. You see them on automatic doors in almost every
store. A microwave mixer diode takes a sample from the Gunn diode and
compares it to any reflected signals. This results in a low frequency
signal that is detected, amplified and signals the door to open. How can
a passive diode do that?
Like I said. You can hit a piece of quartz with a hammer and it will
oscillate; that doesn't mean it's considered and active device. An
active device uses one signal [current, voltage] to control another. As
in amplify or switch. Thermionic valve, transistor, SCR, Triac is what
we are going for.
An active device uses one signal [current, voltage] to control another.
So a relay is an active device?
A relay is a solenoid (no) and a switch (no).
J
Jerry Peters
Guest
dave <ricketzz@earthlink.net> wrote:
But it controls one signal with another.
What about a PIN diode, or even an ordinary switching diode. They've
been commonly used to switch an small ac signal with a dc voltage for
*years*.
On 01/25/2014 01:21 PM, Jerry Peters wrote:
dave <ricketzz@earthlink.net> wrote:
On 01/23/2014 06:05 PM, Michael A. Terrell wrote:
dave wrote:
On 01/23/2014 06:45 AM, Michael A. Terrell wrote:
It is not a switch or a valve.
It's a solid state diode that oscillates. DC in, and ~10 GHZ out.
Search on Gunnplexer. You see them on automatic doors in almost every
store. A microwave mixer diode takes a sample from the Gunn diode and
compares it to any reflected signals. This results in a low frequency
signal that is detected, amplified and signals the door to open. How can
a passive diode do that?
Like I said. You can hit a piece of quartz with a hammer and it will
oscillate; that doesn't mean it's considered and active device. An
active device uses one signal [current, voltage] to control another. As
in amplify or switch. Thermionic valve, transistor, SCR, Triac is what
we are going for.
An active device uses one signal [current, voltage] to control another.
So a relay is an active device?
A relay is a solenoid (no) and a switch (no).
But it controls one signal with another.
What about a PIN diode, or even an ordinary switching diode. They've
been commonly used to switch an small ac signal with a dc voltage for
*years*.
J
Jerry Peters
Guest
Phil Allison <phil_a@tpg.com.au> wrote:
It's called reductio ad absurdum, it's a rhetorical technique Phil.
"Jerry Peters"
An active device uses one signal [current, voltage] to control another.
So a relay is an active device?
** Trying to define a word or term *out of context* is doomed to failure.
It's called reductio ad absurdum, it's a rhetorical technique Phil.
J
Jerry Peters
Guest
Michael A. Terrell <mike.terrell@earthlink.net> wrote:
Or the PIN diode, commonly used to switch rf with a dc voltage.
To get oscillation you need to provide gain to overcome the circuit
losses, so you have some type of amplification happening, which
implies an active device.
Dave doesn't seem to understand any of this, he just keeps parroting
the same words repeatedly.
dave wrote:
On 01/23/2014 06:05 PM, Michael A. Terrell wrote:
dave wrote:
On 01/23/2014 06:45 AM, Michael A. Terrell wrote:
It is not a switch or a valve.
It's a solid state diode that oscillates. DC in, and ~10 GHZ out.
Search on Gunnplexer. You see them on automatic doors in almost every
store. A microwave mixer diode takes a sample from the Gunn diode and
compares it to any reflected signals. This results in a low frequency
signal that is detected, amplified and signals the door to open. How
can a passive diode do that?
Like I said. You can hit a piece of quartz with a hammer and it will
oscillate; that doesn't mean it's considered and active device.
No, it will crush the quartz, resulting in one spike as it breaks up.
An active device uses one signal [current, voltage] to control another.
Like a 'Carbon Amplifier'?
As in amplify or switch. Thermionic valve, transistor, SCR, Triac is
what we are going for.
A rectifier is a switch. Diodes are used as mixers, and the
rectifiers a poorly designed power supply can generate RF that is
coupled into the power line.
Sigh. Small minds like yours will never learn anything.
http://en.wikipedia.org/wiki/Gunn_diode
The Gunn diode is based on the Gunn effect, and both are named for the
physicist J. B. Gunn who, at IBM in 1962, discovered the effect because
he refused to accept inconsistent experimental results in gallium
arsenide as "noise", and tracked down the cause. Alan Chynoweth, of Bell
Telephone Laboratories, showed in June 1965 that only a
transferred-electron mechanism could explain the experimental
results.[3] The interpretation refers to the Ridley-Watkins-Hilsum
theory.
The Gunn effect, and its relation to the Watkins-Ridley-Hilsum effect
entered the monograph literature in the early 1970s, e.g. in books on
transferred electron devices[4] and, more recently on nonlinear wave
methods for charge transport.[5] Several other books that provided the
same coverage were published in the intervening years, and can be found
by searching library and bookseller catalogues on Gunn effect.
http://en.wikipedia.org/wiki/Esaki_diode AKA Tunnel diode was invented
in 1958. It was used as a 14 GHz amplifier in Intelsat V satellite
receiver.
Or the PIN diode, commonly used to switch rf with a dc voltage.
To get oscillation you need to provide gain to overcome the circuit
losses, so you have some type of amplification happening, which
implies an active device.
Dave doesn't seem to understand any of this, he just keeps parroting
the same words repeatedly.
K
Kaz Kylheku
Guest
On 2014-01-25, Jerry Peters <jerry@example.invalid> wrote:
We should probably apply the "active" or "passive" designation to circuits
rather than devices. When we say that a device is active, it means that the
only sensible way of using it is in the role where it provides an active
circuit.
A passive circuit is one in which the energy source for driving the output
signals is derived from the input signals, rather than from some auxiliary
power supply.
Anything else is an active circuit.
Because the energy for driving outputs is derived from inputs in a passive
device, a passive device can never amplify power; though if it contains
inductors, it can step voltage up or down and thereby modify impedance.
A logic inverter circuit built on a relay is definitely active. Justification:
the device produces an output which is based on the input, but which does not
draw energy from the input at all to power the output. Power is applied to the
switch, in series with a load resistor. This energy source is not considered
an input signal.
If the relay's switch is used to pass through or cut off a signal (say as part
of a multiplexer), then we can regard it as passive. When the signal passes
through the relay, it does so without amplification: the output is powered by
the input. The next and previous device are not isolated from each other's
impedances in any way by the relay; it is transparent. Moreover, the relay's
coil is powered by *its* input: the switching mechanism itself does not have
its own source of power.
(Note that by the same logic, we could argue that a FET used for signal
switching also gives rise to a passive circuit.)
dave <ricketzz@earthlink.net> wrote:
On 01/23/2014 06:05 PM, Michael A. Terrell wrote:
dave wrote:
On 01/23/2014 06:45 AM, Michael A. Terrell wrote:
It is not a switch or a valve.
It's a solid state diode that oscillates. DC in, and ~10 GHZ out.
Search on Gunnplexer. You see them on automatic doors in almost every
store. A microwave mixer diode takes a sample from the Gunn diode and
compares it to any reflected signals. This results in a low frequency
signal that is detected, amplified and signals the door to open. How can
a passive diode do that?
Like I said. You can hit a piece of quartz with a hammer and it will
oscillate; that doesn't mean it's considered and active device. An
active device uses one signal [current, voltage] to control another. As
in amplify or switch. Thermionic valve, transistor, SCR, Triac is what
we are going for.
An active device uses one signal [current, voltage] to control another.
So a relay is an active device?
We should probably apply the "active" or "passive" designation to circuits
rather than devices. When we say that a device is active, it means that the
only sensible way of using it is in the role where it provides an active
circuit.
A passive circuit is one in which the energy source for driving the output
signals is derived from the input signals, rather than from some auxiliary
power supply.
Anything else is an active circuit.
Because the energy for driving outputs is derived from inputs in a passive
device, a passive device can never amplify power; though if it contains
inductors, it can step voltage up or down and thereby modify impedance.
A logic inverter circuit built on a relay is definitely active. Justification:
the device produces an output which is based on the input, but which does not
draw energy from the input at all to power the output. Power is applied to the
switch, in series with a load resistor. This energy source is not considered
an input signal.
If the relay's switch is used to pass through or cut off a signal (say as part
of a multiplexer), then we can regard it as passive. When the signal passes
through the relay, it does so without amplification: the output is powered by
the input. The next and previous device are not isolated from each other's
impedances in any way by the relay; it is transparent. Moreover, the relay's
coil is powered by *its* input: the switching mechanism itself does not have
its own source of power.
(Note that by the same logic, we could argue that a FET used for signal
switching also gives rise to a passive circuit.)
M
Michael A. Terrell
Guest
dave wrote:
Sigh. Study that technology, rather than make a fool of yourself.
The proper bias creates a negative resistance, which provides gain.
A neon has hysteresis, not gain. They require a current limiting
resistor, or they will explode. They turn on at a higher voltage than
they turn off so a capacitor across the neon will charge, until the lamp
fires. The cap discharges to the extinguishing point, and repeats the
cycle. We built sirens with a couple neons, a 35W4 and a 50C5 tube back
in the '60s
It's not silly. They were used to provide gain in early days of
electronics. It was a carbon mic, coupled do a earpiece. They had plenty
of gain. Find an old 500 series desk phone and pull the cotton wadding
out of the handle. You'll get feedback. Then there are Magnetic
Amplifiers. There is a whole world of electronics you've never seen.
How about 'Electrolytic Rectifiers'? They were one of the first crude,
but useable ways to convert AC to DC without using a motor/generator
set.
On 01/24/2014 03:22 PM, Michael A. Terrell wrote:
dave wrote:
On 01/23/2014 06:05 PM, Michael A. Terrell wrote:
dave wrote:
On 01/23/2014 06:45 AM, Michael A. Terrell wrote:
It is not a switch or a valve.
It's a solid state diode that oscillates. DC in, and ~10 GHZ out.
Search on Gunnplexer. You see them on automatic doors in almost every
store. A microwave mixer diode takes a sample from the Gunn diode and
compares it to any reflected signals. This results in a low frequency
signal that is detected, amplified and signals the door to open. How
can a passive diode do that?
Like I said. You can hit a piece of quartz with a hammer and it will
oscillate; that doesn't mean it's considered and active device.
No, it will crush the quartz, resulting in one spike as it breaks up.
An active device uses one signal [current, voltage] to control another.
Like a 'Carbon Amplifier'?
As in amplify or switch. Thermionic valve, transistor, SCR, Triac is
what we are going for.
A rectifier is a switch. Diodes are used as mixers, and the
rectifiers a poorly designed power supply can generate RF that is
coupled into the power line.
Sigh. Small minds like yours will never learn anything.
Oscillators do not use one signal to control another. A Gunn diode is a
lot like a neon lamp meets quartz crystal. Not a switch. Not an amplifier.
Sigh. Study that technology, rather than make a fool of yourself.
The proper bias creates a negative resistance, which provides gain.
A neon has hysteresis, not gain. They require a current limiting
resistor, or they will explode. They turn on at a higher voltage than
they turn off so a capacitor across the neon will charge, until the lamp
fires. The cap discharges to the extinguishing point, and repeats the
cycle. We built sirens with a couple neons, a 35W4 and a 50C5 tube back
in the '60s
It's a relatively stupid minor point. I looked it up. I am not going to
be convinced with silliness like "carbon amplifiers".
It's not silly. They were used to provide gain in early days of
electronics. It was a carbon mic, coupled do a earpiece. They had plenty
of gain. Find an old 500 series desk phone and pull the cotton wadding
out of the handle. You'll get feedback. Then there are Magnetic
Amplifiers. There is a whole world of electronics you've never seen.
How about 'Electrolytic Rectifiers'? They were one of the first crude,
but useable ways to convert AC to DC without using a motor/generator
set.
Guest
"passive component Electronics. A component that does not require power
to operate, e.g., a resistor. Contrast with active. "
Umm, if a resistor is operating witthout power, just what is it doing ?
Hey, I am not being a pain, it's the subject.