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Diode
Sci.Electronics.Design is a worldwide Usenet news group that is used to discuss various aspects of Electronic Circuit Design.
We found 1089 threads matching "diode"
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The most relevant threads are listed first
Wrong packaged diode
djj08230 - 2010-02-07 06:17:00
Hello all,
A board we produce has a battery that power a static RAM through a
diode. This is a SMD package, maybe a SMA, but can't say for sure
right now.
We have had a few problems with the battery circuit, that I know have
been solved changing the diode.
I have seen only one of those m...
Diode + Diode Zener and Inductive load
Bicio - 2008-05-21 07:52:00
I know that inserting a normal diode in parallel to a inductor is
usefull for preventing voltage spikes when the current drop to zero
(for example due to a transistor).
So, with a diode, the inductor discharge itself with a time constant
of L/R.
With a Zener in series to a diode, the inductor d...Flyback output diode peak curent vs average current
Mook Johnson - 2008-07-03 12:12:00
In a DCM flyback with its high peak to average current ratio. When sizing a
diode do you rate thediode for the maximum peak current. I have a 2A
average current with 12A peaks at the start of the flyback. Repeats every
5uS.
Which current rating should I look for in the diode? 3A? 6A? 15...Diode Laser
Jon Slaughter - 2010-03-09 14:36:00
What does a diode laser module add to a diode laser? A voltage regulator or
current limiter?
...LT Spice ideal diode
John Larkin - 2010-04-04 11:02:00
I recall somewhere, maybe in this ng, the procedure for making an
ideal diode in LT Spice. But I can't find it now. Help!
The ideal diode should be a stock pulldown part. I wonder why it's
not.
And why can't I change the voltage of one of their pull-from-the-list
zeners? That would sure...PAD5
John Larkin - 2009-05-01 18:11:00
I just got some samples of a Vishay PAD5 picoamp-leakage diode, in
SOT23.
Pin 3 to pin 1 ohms as a diode
Pin 3 to pin 2 ohms as a diode
Pin 1 to pin 2 ohms as an 8K resistor.
Next project is to actually measure the forward and reverse curves,
down to pA levels.
Nice part, except...Collector-Base diode of BJT as an Ultra low leakage protection diode
Ebrahim - 2009-06-12 10:26:00
Hello,
I want to know, is there anyone here that has used a BJT instead of an
ultra low leakage diode( ...pn junction diode
Lax - 2008-01-10 14:14:00
Say we have a silcon pn junction (diode) - i.e., a block of p-type on
left, attached to a block of n-type semiconductor on right:
anode ------[ p | n ]------ cathode
Because of diffusion we get a barrier potention at the junction, which
makes the n-side/cathode 0.7V higher than t...Anybody seen a spice model for a laser diode?
Michael - 2008-01-26 08:29:00
Hi there - I was thinking about trying to design a laser driver over
the weekend. Unfortunately, I can't seem to find a spice model for a
laser diode, putting a bit of a squabash on that plan.
Anybody know where I can find one? Ideally I'd find one for a very
normal ~5mw red laser diode - like...Diode vs TVS
Vladimir Vassilevsky - 2009-09-14 22:38:00
I tested the basic reverse polarity protection circuit:
12V battery, 100A fuse, diode.
If the TVS (1.5SMC24AT3) is used, it gets destroyed into the short
circuit. The fuse is blown, of course; but the device is damaged. This
happens at the very first attempt.
However if the trivial 1N54...Re: Interesting New Passive Component?
MooseFET - 2008-05-01 09:45:00
On May 1, 6:22 am, Mark wrote:
> http://www.embedded.com/products/integratedcircuits/207403718?_reques...
>
> Mark
It is a new type of diode. Since a diode is any active part with two
legs and this part can't really be called passive I suggest that the
term diode be applied to it.
...Super Diodes and detectors
Graeme Zimmer - 2010-07-21 23:07:00
Hi,
This post was prompted by the recent discussion about Diode-Connected
Transistors.
The Crystal Set nutters are always seeking the holy grail of a perfect diode
detector
(it must be passive of course).
The problem is that existing diodes are lousy rectifiers at low currents
(three...Fast zener diode substitute
Yvan - 2010-02-06 16:58:00
I decided to built this:
http://notes.ump.edu.my/fkee/e-Magazine/Elektor%202004/Articles/E/e04b020.pdf
It keeps the battery a little bit active, preventing sulphation by
loading the battery with a hefty current (40 A) for a short interval
(50 μs) approximately every two minutes.
But they...Re: BJTs as ultra low leakage protection diodes
John Larkin - 2009-06-14 16:22:00
On Sun, 14 Jun 2009 16:07:11 -0400, Phil Hobbs
wrote:
> Ebrahim wrote:
> > Phil Hobbs wrote:
>
> > > The diode needs almost no breakdown voltage at all--certainly not
> > > 100V. Something like a BFT25 B-C junction (about 0.3 pF) will work
> > > great. (WDNNS PAD-1!)
> > >
>...How pin diode works?
2008-02-02 05:11:00
I dont't understand how pin diode reach the equilibrium state...
I can consider the pin diode as a duble junction p-i and i-n (with
ideal intrinsic layer without any dopant). First i consider only the p-
i junction...when the two parts are in contact, holes move for
diffusion from p-semiconduct...Re: Need Circuit Design -- Cheap...
John Larkin - 2009-04-29 23:36:00
On Wed, 29 Apr 2009 20:09:25 +1000, Bob Larter
wrote:
> Bob Thomas wrote:
> > > Negatory, good buddy!
> > > The spike "originates" in the relay coil.
> >
> > I might get jumped on for having the wrong reason, but from my
> > understanding the spike is generated when the power is sw...Diode Array - anyone make them.....cheap?
WangoTango - 2010-08-10 18:10:00
I have been looking for a simple diode array that would be the
equivalent of, say, (8) 1N914 switching diodes in a 16 pin package.
Through hole or surface mount, and under a buck. I have found a couple
that were in the $7.00US range and some crazy military spec things that
were in the $70U...Re: design help
John Larkin - 2009-02-26 19:19:00
On Thu, 26 Feb 2009 18:08:03 -0600, John Fields
wrote:
> On Thu, 26 Feb 2009 12:48:34 -0800, John Larkin
> wrote:
>
>
> > > > > > +V> -----------+--------+-----+----+--------+
> > > > > > | |
> > > > > > [10k] ...Schottky effect questions
Paul - 2008-02-15 09:33:00
Hi,
Perhaps I don't understand Schottky effect so well. Must the metal be
a certain thickness? The following page shows some Schottky diode
history, which starts with the Cat's Whisker. Must the metal wire
(Cat's Whisker) that contacts the semiconductor be so thin? Then
there's the point con...protection diodes, motor noise
2009-03-24 14:50:00
It seems common practice to put a protection diode upstream of a
quickly-switching mosfet, in parallel with an inductor (motor, relay):
http://www.kpsec.freeuk.com/components/diode.htm
This Mechanical Engineering class page recommends adding a small 1 nF
to 0.1 uF cap in parallel with small mo...Re: Need Circuit Design -- Cheap...
krw - 2009-04-30 20:37:00
On Thu, 30 Apr 2009 18:21:03 +0100, John Devereux
wrote:
> Bob Larter writes:
>
> > Jim Thompson wrote:
> > > On Wed, 29 Apr 2009 20:35:12 +0100, John Devereux
> > > wrote:
> > >
> > > > Bob Larter writes:
> > > >
> > > > > Bob Thomas wrote:
> > > > > > > Negatory, ...VCSEL Laser diode ?
Hammy - 2008-06-04 06:52:00
Can a laser diode like the VCSEL OPV382 850nm be pulsed similar to an
IRDA; carrier frequency and data?
Data sheet.
http://www.optekinc.com/pdf/OPV382.pdf
What would be the maximum transmission distance?
The 2 page data sheet on the diode is pathetic, so if anyone has
experience with t...Shottky diode bridge for 6o Hz any guess why?
Bob T - 2008-01-28 22:00:00
I've been asked to reverse engineer a product that has a very unusual DC
power supply I'm trying to understand
It has a power transformer for the line with two secondary windings with a
shottky diode tying one end of each together
The outer ends of these windings are then connected to a 4 diod...Buck converter failures
D Yuniskis - 2010-04-12 18:39:00
Hi,
I've got an external SATA-USB cradle that gave up
the ghost.
12VDC supply (used by the spindle motor) which is
then dropped down to 5V (for the logic) via a
buck converter (I am guessing this based on visually
examining the foil traces -- I'll have to drag out
the stereoscope to read ...Re: Are 4 terminal FETs (G, D, S, B) available? If so, what are they used for?
Tim Williams - 2008-06-10 11:16:00
"Michael" wrote in message
news:021644e0-5177-4933-a606-75528af0d3bd@k30g2000hse.googlegroups.com...
> So, anyways - I was just thinking. Are four terminal FETs - fets where
> the body and source are not connected - available? Do they have a
> special name or anything like that? What woul...Re: How does the rated on resistance of an N-FET differ for IDS < 0?
Michael - 2008-07-18 15:11:00
On Jul 18, 1:37=A0pm, Tom Bruhns wrote:
> On Jul 18, 9:58 am, Michael wrote:
>
> > Hi there - in FET datasheets they always give lots of nice VDS vs IDS
> > charts and so on, but always for positive VDS and positive IDS. They
> > also will give limited specs for the body diode. Bu...Re: Audio amplifier IC or other low parts count method
langwadt@fonz.dk - 2008-10-18 20:29:00
On 19 Okt., 00:41, MooseFET wrote:
> On Oct 18, 1:11 pm, "RST Engineering \(jw\)"
> wrote:
>
> > THere are two ways to do reverse protection. One is, as you noted, a series
> > diode in line with the supply. THe other one is a diode to ground that
> > blows the fuse. That one...Re: Laser Diode Modulation Help
Jan Panteltje - 2010-07-28 14:55:00
On a sunny day (Wed, 28 Jul 2010 12:28:10 -0500) it happened "jwolf"
wrote in
:
I dunno, maybe like this?
It actually could work, here a spice simulation with real component values,
ftp://panteltje.com/pub/laser_supply.gif
I replaced the laser diode with some Schotky, and the pots ...Re: BJTs as ultra low leakage protection diodes
John Larkin - 2009-06-14 17:09:00
On Sun, 14 Jun 2009 16:26:28 -0400, Phil Hobbs
wrote:
> John Larkin wrote:
> > On Sun, 14 Jun 2009 16:07:11 -0400, Phil Hobbs
> > wrote:
> >
> > > Ebrahim wrote:
> > > > Phil Hobbs wrote:
> > >
> > > > > The diode needs almost no breakdown voltage at all--certainly not
...Re: DC converter
john - 2010-02-18 16:15:00
Hi,
Yes the function generator is feeding the bridge. I increased the
input voltage frequency upto 5000Hz and 50khz and amplitude to 24
volts peak to peak. And also took the full bridge out and replace with
one diode and connect a 20kohm as a load and 220uF 25 volts capacitor
in parallel wi...PWM with low side MOSFET drive for DC motor (coast or brake when off?)
Brandon - 2008-03-20 17:36:00
I need to correct my understanding of a low side MOSFET switching for
a DC motor. I have a DC motor in parallel with a diode connected to
the drain of an n-channel MOSFET on one side (anode side of the diode)
and the motor supply voltage on the other. When the MOSFET is
switched on, the motor ...Re: using a synchronous rectifier in a boost circuit
Joerg - 2010-06-29 12:49:00
Jamie wrote:
> On 6/28/2010 6:41 PM, Joerg wrote:
> > Jamie wrote:
> > > Hi,
> > >
> > > I am making a high power boost circuit (500watts+ with 12VDC input and
> > > 13.5VDC output). The boost diode dissipates more than 30watts so I am
> > > looking for a circuit to replace this diode...Schottky-barrier diode and frequency performance
karthikbalaguru - 2007-12-28 13:02:00
Hi,
How can a Schottky-barrier diode enhance frequency performance ?
Can someone here kindly provide me with some link or document that
talks in detail about Schottky-barrier diode's relation with frequency
performance.
Thx in advans,
Karthik Balaguru
...Re: H Bridge Driver for Single Coil, How to add protection?
Jamie - 2010-02-26 18:11:00
Myauk wrote:
> Dear All,
>
> I am designing H-Bridge Relay Circuit.
>
> The coil resistance is 36 ohms. Inductance is 500mH measured at 100Hz,
> 1V pk to pk with Agilent LCR Meter.
>
> Do I need additional snubber or TVS to protect the switches? If so how
> to add the protecti...Re: Ideas for Design ;-)
Jasen Betts - 2008-10-18 06:52:00
On 2008-10-16, RST Engineering (jw) wrote:
> OOOOkay, I'm not seeing the humor. Either reverse biasing an LED will in
> fact turn it off (page 65) or somebody reinventing 4000 series logic on page
> 66. Which one is the knee-slapper?
>
> Jim
There's an (inadequate) 1N914 diode to...Long Vcc traces
Bob.Jones5400@gmail.com - 2009-07-14 20:45:00
Suppose you have a long Vcc trace with several stubs off it. Say
upwards of a few feet. Stubs are ic's. Ic's generally need "bypass"
caps in case of power fluctuation. Adding bypass caps to each stub is
very inconvenient but adding to the end of the trace is easy.
Could I not simply add a larg...Re: RF energy harvesting project
Tim Wescott - 2010-07-07 17:31:00
On 07/07/2010 12:01 PM, MikeF wrote:
> Hello, I am working on a senior design project that harvests energy
> from a 45watt UHF Ham Radio transmitter. Currently I am getting 3.4v
> peak-peak at the receiving antenna. When I attempt to rectify the
> signal into a DC voltage across a Schottky d...Re: EMI prevention / protection?
whit3rd - 2009-10-30 14:26:00
On Oct 30, 7:43=A0am, "dave.harper" wrote:
> I'm using a wein bridge oscillator as an audio tone generator in a
> radio modem (~2kHz). =A0Ironically, when the transmitter is turned on,
> RF from the transmitter (~144MHz) causes the oscillations to die
> pretty quickly (a fraction of a sec...Diode reverse-bias resistivity?
eromlignod - 2008-01-17 09:45:00
Hi guys:
I'm an ME, so I have a basic knowledge of semiconductors, but not as
in-depth as you EE's.
When a diode is connected in reverse (the direction where current
doesn't flow), does it behave like an insulator or like a
semiconductor? In other words, does it have an extremely high
res...Re: synch. or non-synch voltage reg? what's the difference?
Franco - 2008-04-03 12:19:00
On 3 abr, 11:53, Franco wrote:
> Hi guys, I would like to know the difference between synchronous and
> non-synchronous switching voltage regulators. Can someone help me?
>
> Greetings.
Maybe I got the answer. Apparently, synchronous Buck SMPS's use 2
MOSFETs instead of 1 MOSFET and 1...