11 votes
Accepted

Creating a circuit with negative differential resistance

Why does voltage decrease when current increases? By negative differential resistance, I mean a circuit where the current decreases when the voltage increases. Well, true... But what is the physical ...
Circuit fantasist's user avatar
9 votes

What is this part marked WH5 33?

It's a Nexperia MMBZ27VAL TVS diode. (Source: lcsc.com)
nanash1's user avatar
  • 4,643
8 votes

Creating a circuit with negative differential resistance

Absolute negative resistances without as external energy source cannot exist, as they would violate the laws of thermodynamics. A normal (positive) resistor puts out heat to the surroundings – voltage ...
Dirceu Rodrigues Jr's user avatar
7 votes
Accepted

Analysis of the below op-amp circuit and its waveform

It's difficult to know what answer the author of this question expects, because the answer will depend heavily on the values of R and C. If the period \$T\$ of the input waveform is significantly ...
Simon Fitch's user avatar
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6 votes
Accepted

identifying an SMD component (marked as 1J15)

From searching on The ultimate SMD marking codes database for codes starting 1J it could be a GS1006FL from Won-Top Electronics (or possibly now part of PANJIT ...
Chester Gillon's user avatar
5 votes

Creating a circuit with negative differential resistance

Is it possible to construct a circuit with negative differential resistance by only using components that have no negative differential resistance (e.g., resistors, diodes, BJTs, etc)? [...] Note ...
比尔盖子's user avatar
  • 6,800
5 votes

Creating a circuit with negative differential resistance

Here's a very simple way to do it, a circuit known as a "lambda diode": simulate this circuit – Schematic created using CircuitLab When the voltage source is close to zero volts, the ...
Hearth's user avatar
  • 32.6k
5 votes

Creating a circuit with negative differential resistance

Edit: I misread the question, which referred to differential resistance, presumably meaning an V-I curve with a region of negative gradient. In that context my answer below is not a good one, except ...
Simon Fitch's user avatar
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4 votes

Creating a circuit with negative differential resistance

By negative differential resistance, I mean a circuit where the current decreases when the voltage increases. Here is an example of a simple circuit that has this feature. When the applied voltage [...
Fabio Barone's user avatar
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4 votes
Accepted

Finding resistor and capacitor values for a snubber circuit to reduce diode's reverse recovery time

Here is "some" answer (simplified) to your question on what represents the RC values. The value of the Ls inductor fixed to 10 uH. NB: The diode I used 1N3495 is rated to max 10 kHz, 25 A, ...
Antonio51's user avatar
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3 votes

How can I build a full wave rectifier with a grounded load without the use of a transformer?

a serious conflict in your propositions I now understand somewhat better what you are after, once you added that transfer function picture. Your problem is one about DC transfer and not about AC. ...
periblepsis's user avatar
  • 8,940
3 votes

How can I build a full wave rectifier with a grounded load without the use of a transformer?

You can't do it. Grounding both the AC source and the load shorts out one of the diodes in the bridge. You need the transformer for isolation so the short doesn't occur.
DoxyLover's user avatar
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3 votes

Analysis of the below op-amp circuit and its waveform

The original problem didn't specify the details about R & C, but upon assuming the condition that time-constant RC >> T, the capacitor C won't really be able to charge/discharge through R ...
Gawdfather47's user avatar
3 votes
Accepted

How to calculate diode forward voltage (Vd) for a MOSFET within a SEPIC?

An assumed value suffices. The particular solutions to these equations aren't important, as the real circuit will vary due to component values, supply and load conditions, and a controller is used to ...
Tim Williams's user avatar
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3 votes

Manufacturer of electronic components

As clearly printed on the part, it would appear this was made by TDK.
Hearth's user avatar
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2 votes
Accepted

Will voltage at the inputs/outputs destroy an unpowered opamp?

To determine this, take a look at the Absolute Maximum Ratings in the datasheet. When the maximums are specified directly in volts, you can usually drive those inputs without VCC. When there are ESD ...
Dean Franks's user avatar
  • 3,711
2 votes

Identify SOD882 diode marked F1

There are several diodes marked F1 from several manufacturers, but this one looks very much like a PESD5V0S1BL315 ESD diode as offered on AliExpress and Alibaba (no affiliation, in fact, I avoid ...
ocrdu's user avatar
  • 9,205
2 votes

Identify diode specs

Manufacturer: Rohm Semiconductor Manufacturer part number: RB051L-40 (obsolete) or RB051LAM-40 (active) or a clone of them Data sheet: RB051L-40, RB051LAM-40 Distributor link: click Part Type: ...
CatastrophicFailure's user avatar
2 votes
Accepted

Why would an IV characteristic plot for a diode be linear and not exponential?

Using the following circuit, which measures current through a standard 1N4001 diode, and also through a 42mΩ resistor, take a look at the plot of currents as the voltage source is swept from 0V ...
Simon Fitch's user avatar
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2 votes

Why would an IV characteristic plot for a diode be linear and not exponential?

At high currents, the internal resistance of the diode does, indeed, begin to dominate the V-I characteristics of a diode. That being said, my experience is that simulators give very inaccurate ...
Math Keeps Me Busy's user avatar
2 votes

Why do the diodes make a huge difference in an RC sinewave generator circuit?

The overall gain should be "3". It can't be with only the resistors. When you add the diodes, you add a "resistor" which decreases with the amplitude of the signal. So, at start, ...
Antonio51's user avatar
  • 13.3k
1 vote

Why do the diodes make a huge difference in an RC sinewave generator circuit?

The problem with your circuit is that the dimensioning is wrong. The oscillation condition requires that the closed-loop gain at the desired oscillation frequency is "3". Hence, the ...
LvW's user avatar
  • 26.8k
1 vote

Analysis of the below op-amp circuit and its waveform

Generalized voltage divider configuration Since the question of the so-called “DC restoration circuit” was raised here, I will share my finding that there is no difference between this circuit and the ...
Circuit fantasist's user avatar
1 vote

Diodes selection for High Side switch protection against inductive load

The voltage on an inductor is Ldi/dt. Your "L" is 140 mH. Your device can switch "off" in 15 usec, so if your inductor has 1.4 amps flowing through it, the current changes from 1....
John Birckhead's user avatar
1 vote

Help me on this voltage divider question

The assumption here is that the LED is not drawing a significant current when it has 2 volts across it. This means that we know that the 2 volts is purely due to the resistor divider formed by R1 and ...
Andy aka's user avatar
  • 457k
1 vote

Manufacturer of electronic components

It appears to be a hybrid circuit, made by TDK and probably custom for the application. That kind of construction was kind of a fad with Japanese designers many years ago, just before SMT was widely ...
Spehro Pefhany's user avatar
1 vote

Why would an IV characteristic plot for a diode be linear and not exponential?

In your first graph, 600 mA flows when 30 volts is applied. This means that the diode is fully forward conducting and the 50 Ω resistor dominates (30/0.6 = 50). In the other graph, you have a ...
Andy aka's user avatar
  • 457k
1 vote
Accepted

What is this shorted diode from a Bosch BMS for an eBike?

It is a FSS16 HE3 TRT* diode from FAGOR. I suggest HE3 suffix as you mentionned that your board is manufactured by Bosch (automotive). Explanation of the marking available here
vivier's user avatar
  • 597
1 vote

Creating a circuit with negative differential resistance

Any sane switching mode power supply, when powering some load, will behave as negative diferential resistance over their rated input voltage range. This is because their efficiency does not change ...
fraxinus's user avatar
  • 9,194
1 vote

Reverse Breakdown Voltage for a diode

Diodes have to work in both the forward biased and reverse biased regions. For example when used to rectify an AC waveform they are exposed to the full peak forward voltage and then in the other half ...
RoyC's user avatar
  • 10k

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